Subjects -> AGRICULTURE (Total: 981 journals)
    - AGRICULTURAL ECONOMICS (93 journals)
    - AGRICULTURE (680 journals)
    - CROP PRODUCTION AND SOIL (120 journals)
    - POULTRY AND LIVESTOCK (58 journals)

AGRICULTURE (680 journals)            First | 1 2 3 4     

Showing 201 - 263 of 263 Journals sorted by number of followers
Biodiversity     Hybrid Journal   (Followers: 27)
Agriculture & Food Security     Open Access   (Followers: 21)
Future of Food : Journal on Food, Agriculture and Society     Open Access   (Followers: 20)
African Journal of Food, Agriculture, Nutrition and Development     Open Access   (Followers: 18)
Nature Plants     Full-text available via subscription   (Followers: 17)
Advances in Agriculture     Open Access   (Followers: 15)
Agricultural History Review     Full-text available via subscription   (Followers: 15)
Indian Journal of Agricultural Sciences     Open Access   (Followers: 12)
Biological Agriculture & Horticulture : An International Journal for Sustainable Production Systems     Partially Free   (Followers: 11)
Journal of Land and Rural Studies     Hybrid Journal   (Followers: 11)
Advances in Life Science and Technology     Open Access   (Followers: 11)
Agriculture and Food Sciences Research     Open Access   (Followers: 10)
Agricultural Research     Hybrid Journal   (Followers: 10)
Indian Horticulture     Full-text available via subscription   (Followers: 9)
Culture, Agriculture, Food and Environment     Hybrid Journal   (Followers: 8)
Arboricultural Journal : The International Journal of Urban Forestry     Hybrid Journal   (Followers: 7)
Aceh International Journal of Science and Technology     Open Access   (Followers: 7)
Invertebrate Reproduction & Development     Hybrid Journal   (Followers: 6)
Journal of Agriculture and Sustainability     Open Access   (Followers: 6)
Journal of Agriculture and Social Research (JASR)     Open Access   (Followers: 6)
New Journal of Botany     Hybrid Journal   (Followers: 6)
Journal of Agriculture, Forestry and the Social Sciences     Full-text available via subscription   (Followers: 6)
International Journal of Agriculture and Forestry     Open Access   (Followers: 6)
Acta Scientiarum. Animal Sciences     Open Access   (Followers: 5)
Journal of Advances in Agriculture     Open Access   (Followers: 5)
American Journal of Rural Development     Open Access   (Followers: 5)
EvoDevo     Open Access   (Followers: 5)
Cereal Chemistry     Full-text available via subscription   (Followers: 4)
Acta Agrobotanica     Open Access   (Followers: 4)
Italian Journal of Agronomy     Open Access   (Followers: 4)
Journal of Agricultural Science     Open Access   (Followers: 4)
EU Agrarian Law     Open Access   (Followers: 4)
Studies in Australian Garden History     Full-text available via subscription   (Followers: 4)
Journal of Agriculture and Rural Development in the Tropics and Subtropics     Open Access   (Followers: 4)
Tanzania Journal of Agricultural Sciences     Open Access   (Followers: 4)
Journal of Modern Agriculture     Open Access   (Followers: 4)
Journal of Agriculture and Natural Resources Sciences     Open Access   (Followers: 3)
Journal of the Ghana Science Association     Full-text available via subscription   (Followers: 3)
Journal of Science and Technology (Ghana)     Open Access   (Followers: 3)
Journal of Agricultural Extension and Rural Development     Open Access   (Followers: 3)
Biocatalysis and Agricultural Biotechnology     Hybrid Journal   (Followers: 3)
Sustainable Agriculture Research     Open Access   (Followers: 3)
Food and Energy Security     Open Access   (Followers: 3)
International Journal of Agricultural Research, Innovation and Technology     Open Access   (Followers: 3)
International Journal of Applied Agriculture and Apiculture Research     Open Access   (Followers: 3)
Agra Europe     Full-text available via subscription   (Followers: 3)
Journal of Agricultural Chemistry and Environment     Open Access   (Followers: 3)
Asian Journal of Medical and Biological Research     Open Access   (Followers: 3)
Acta Universitatis Sapientiae, Alimentaria     Open Access   (Followers: 3)
Journal of Essential Oil Research     Hybrid Journal   (Followers: 3)
Diatom Research     Hybrid Journal   (Followers: 3)
Journal of Agricultural Extension     Open Access   (Followers: 2)
Nigerian Food Journal     Full-text available via subscription   (Followers: 2)
International Journal for Parasitology : Parasites and Wildlife     Open Access   (Followers: 2)
Agricultura Tropica et Subtropica     Open Access   (Followers: 2)
Journal of Apicultural Science     Open Access   (Followers: 2)
International Journal of Agricultural Management and Development     Open Access   (Followers: 2)
Ciencia forestal en México     Open Access   (Followers: 2)
Revista Cubana de Ciencia Agrícola     Open Access   (Followers: 2)
Journal of Agriculture and Food Sciences     Full-text available via subscription   (Followers: 2)
Tropical Agricultural Research and Extension     Open Access   (Followers: 2)
Rural China     Hybrid Journal   (Followers: 2)
Rural Sustainability Research     Open Access   (Followers: 2)
Journal of Biology, Agriculture and Healthcare     Open Access   (Followers: 2)
Agro-Science     Full-text available via subscription   (Followers: 2)
Ghana Journal of Agricultural Science     Full-text available via subscription   (Followers: 2)
New Zealand Journal of Agricultural Research     Hybrid Journal   (Followers: 2)
Tropical Agricultural Research     Open Access   (Followers: 2)
Journal of Sustainable Society     Open Access   (Followers: 2)
Journal of Food Security     Open Access   (Followers: 2)
Journal of Agricultural Engineering     Open Access   (Followers: 2)
Revista Verde de Agroecologia e Desenvolvimento Sustentável     Open Access   (Followers: 2)
Huria : Journal of the Open University of Tanzania     Full-text available via subscription   (Followers: 2)
Buletin Peternakan : Bulletin of Animal Science     Open Access   (Followers: 1)
Berkala Ilmiah Pertanian     Open Access   (Followers: 1)
Journal of Agricultural Studies     Open Access   (Followers: 1)
RIA. Revista de Investigaciones Agropecuarias     Open Access   (Followers: 1)
Agricultural Commodities     Full-text available via subscription   (Followers: 1)
Journal of Agricultural Engineering     Full-text available via subscription   (Followers: 1)
Jurnal Veteriner     Open Access   (Followers: 1)
Archivos de Zootecnia     Open Access   (Followers: 1)
Journal of Natural Sciences Research     Open Access   (Followers: 1)
Bulletin of University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca : Food Science and Technology     Open Access   (Followers: 1)
Wartazoa. Indonesian Bulletin of Animal and Veterinary Sciences     Open Access   (Followers: 1)
Research in Agriculture, Livestock and Fisheries     Open Access   (Followers: 1)
COCOS : The Journal of the Coconut Research Institute of Sri Lanka     Open Access   (Followers: 1)
Emirates Journal of Food and Agriculture     Open Access   (Followers: 1)
Frontiers in Science     Open Access   (Followers: 1)
Global Approaches to Extension Practice : A Journal of Agricultural Extension     Full-text available via subscription   (Followers: 1)
Chemical and Biological Technologies for Agriculture     Open Access   (Followers: 1)
Progressive Agriculture     Open Access   (Followers: 1)
Folia Horticulturae     Open Access   (Followers: 1)
Rivista di Studi sulla Sostenibilità     Full-text available via subscription   (Followers: 1)
Journal of Science Foundation     Open Access   (Followers: 1)
Annals of Agricultural Sciences     Open Access   (Followers: 1)
Avances en Investigacion Agropecuaria     Open Access   (Followers: 1)
International Journal of Sustainable Agricultural Management and Informatics     Hybrid Journal   (Followers: 1)
Bangladesh Journal of Agricultural Research     Open Access   (Followers: 1)
Journal of Agricultural Sciences     Open Access   (Followers: 1)
Jurnal Ilmu dan Kesehatan Hewan (Veterinary Science and Medicine Journal)     Open Access   (Followers: 1)
Arquivos do Instituto Biológico     Open Access   (Followers: 1)
International Journal of Recycling of Organic Waste in Agriculture     Open Access   (Followers: 1)
International Journal of Agricultural Extension     Open Access   (Followers: 1)
Innovare Journal of Agricultural Science     Open Access   (Followers: 1)
International Journal of Agriculture System     Open Access   (Followers: 1)
Acta Technologica Agriculturae     Open Access   (Followers: 1)
Plant Knowledge Journal     Open Access   (Followers: 1)
Iranian Journal of Applied Animal Science     Open Access   (Followers: 1)
Journal of Degraded and Mining Lands Management     Open Access   (Followers: 1)
Revista Brasileira de Higiene e Sanidade Animal     Open Access   (Followers: 1)
Science, Technology and Arts Research Journal     Open Access   (Followers: 1)
Nigerian Journal of Technological Research     Full-text available via subscription   (Followers: 1)
Social and Natural Sciences Journal     Open Access  
Jurnal Agroteknologi     Open Access  
Perspectivas Rurales Nueva Época     Open Access  
Organic Farming     Open Access  
Research Ideas and Outcomes     Open Access  
Jurnal Udayana Mengabdi     Open Access  
Landtechnik : Agricultural Engineering     Open Access  
International Letters of Natural Sciences     Open Access  
Agrociencia Uruguay     Open Access  
Heliyon     Open Access  
Ciência e Técnica Vitivinícola     Open Access  
Oilseeds and fats, Crops and Lipids     Open Access  
Annals of Silvicultural Research     Open Access  
Pastura : Journal Of Tropical Forage Science     Open Access  
Journal of Citrus Pathology     Open Access  
Revista Iberoamericana de las Ciencias Biológicas y Agropecuarias     Open Access  
Kansas Agricultural Experiment Station Research Reports     Open Access  
International Journal of Secondary Metabolite     Open Access  
Scientia Agropecuaria     Open Access  
Pelita Perkebunan (Coffee and Cocoa Research Journal)     Open Access  
Revista de Agricultura Neotropical     Open Access  
Cogent Food & Agriculture     Open Access  
Fave : Sección ciencias agrarias     Open Access  
Revista de Ciências Agrárias     Open Access  
Review of Agrarian Studies     Open Access  
Nigerian Journal of Biotechnology     Open Access  
Nigeria Agricultural Journal     Full-text available via subscription  
Annales des Sciences Agronomiques     Full-text available via subscription  
Journal of the Bangladesh Agricultural University     Open Access  
Journal of Buffalo Science     Hybrid Journal  
Revista de Ciências Agroveterinárias     Open Access  
Tropical Grasslands - Forrajes Tropicales     Open Access  
Research in Plant Sciences     Open Access  
World Journal of Agricultural Research     Open Access  
Universal Journal of Agricultural Research     Open Access  
Research & Reviews : Journal of Agriculture Science and Technology     Full-text available via subscription  
Revue Marocaine des Sciences Agronomiques et Vétérinaires     Open Access  
Nativa     Open Access  
SAARC Journal of Agriculture     Open Access  
West African Journal of Applied Ecology     Open Access  
Journal of Agricultural Research and Development     Full-text available via subscription  
Journal de la Recherche Scientifique de l'Universite de Lome     Full-text available via subscription  
Global Journal of Agricultural Sciences     Full-text available via subscription  
Agrosearch     Open Access  
Agronomie Africaine     Full-text available via subscription  
Professional Agricultural Workers Journal     Open Access  
Interciencia     Open Access  
Nepal Journal of Science and Technology     Open Access  
Journal of the Saudi Society of Agricultural Sciences     Open Access  
Information Processing in Agriculture     Open Access  
Sabaragamuwa University Journal     Open Access  
Ceiba     Open Access  
Research in Sierra Leone Studies : Weave     Open Access  
The Agriculturists     Open Access  
La Calera     Open Access  
Selçuk Tarım ve Gıda Bilimleri Dergisi     Open Access  
Revista de la Universidad del Zulia     Open Access  
Journal of Arid Land     Hybrid Journal  
Rangifer     Open Access  
Encuentro     Open Access  
Journal Of Agrobiotechnology     Open Access  
Coffee Science     Open Access  
Bangladesh Journal of Scientific Research     Open Access  
Landbohistorisk Tidsskrift     Open Access  
Biotecnología en el Sector Agropecuario y Agroindustrial     Open Access  
Walailak Journal of Science and Technology     Open Access  
Universidad y Ciencia     Open Access  
Tropical and Subtropical Agroecosystems     Open Access  
Terra Latinoamericana     Open Access  
Revista Iberoamericana de Tecnologia Postcosecha     Open Access  
Revista Brasileira de Ciências Agrárias     Open Access  
Multiciencias     Open Access  
Ensaios e Ciência : Ciências Biológicas, Agrárias e da Saúde     Open Access  
Bioagro     Open Access  
Agroalimentaria     Open Access  
Revista Mexicana de Ciencias Agrícolas     Open Access  
Revista U.D.C.A Actualidad & Divulgación Científica     Open Access  
Revista Ciencias Técnicas Agropecuarias     Open Access  
Revista Chapingo. Serie horticultura     Open Access  
Pastos y Forrajes     Open Access  
Fitosanidad     Open Access  
Cultivos Tropicales     Open Access  
Cuadernos de Desarrollo Rural     Open Access  
Ciencia e Investigación Agraria     Open Access  
Agronomía Mesoamericana     Open Access  
Agronomía Costarricense     Open Access  
Agrociencia     Open Access  
Agrivita : Journal of Agricultural Science     Open Access  

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Revista de Ciências Agrárias
Number of Followers: 0  

  This is an Open Access Journal Open Access journal
ISSN (Print) 0871-018X
Published by SciELO Homepage  [672 journals]
  • Geostatistical multivariate for management zone design for agricultural
           experiment allocation

    • Abstract: RESUMO O desenvolvimento agrícola depende, consideravelmente, da pesquisa experimental, fazendo-se necessário minimizar as variações existentes no solo para obter resultados mais precisos. Portanto, objetivou-se com o presente trabalho quantificar a variabilidade espacial dos atributos do solo e definir Zonas de Manejo (MZs) mais homogêneas através da geoestatística multivariada para alocar áreas experimentais agrícolas. O experimento foi desenvolvido em Petrolina, Pernambuco, Brasil. Foram coletadas amostras de solo deformadas seguindo uma grade amostral com 56 pontos georreferenciados nas camadas de 0,00 a 0,20 m e 0,40 a 0,60 m de profundidade. Foram realizadas as análises granulométricas e químicas do solo. Foi realizada a análise de componentes principais (ACP). Foi verificada a dependência espacial das variáveis analisadas e dos componentes principais (CPs) utilizando semivariogramas experimentais e os mapas foram obtidos pelo interpolador Krigagem ordinária. A delimitação da área em zonas foi realizada com uso do algoritmo de agrupamento fuzzy c-means. Os resultados mostraram que nos dois primeiros CPs predominaram os elementos relacionados à acidez do solo e que a área deverá ser delimitada em três zonas. O delineamento de MZs com base em CP se mostrou uma ferramenta importante no auxílio da alocação de experimentos agrícolas, reduzindo o erro advindo da heterogeneidade que pode ocorrer dentro dos blocos experimentais.ABSTRACT Agricultural development relies heavily on experimental research and it is necessary to minimize soil variations for more accurate results. Therefore, the present study aims to quantify the spatial variability of soil attributes and to define more homogeneous Management Zones (MZs) through the multivariate geostatistics to allocate agricultural experimental areas. The experiment was carried out in Petrolina city, Pernambuco state, Brazil. Disturbed soil samples were collected following a sample grid with 56 georeferenced points in the layers of 0.00 to 0.20 m and 0.40 to 0.60 m depths. The granulometric and chemical analyzes of the soil were performed. Principal components analysis (PCA) was performed. The spatial dependence of the analyzed variables and the principal components (PCs) was verified using experimental semivariogramas. Maps were obtained by the ordinary Kriging interpolator. The delimitation of the MZ was performed using the fuzzy c-means clustering algorithm. The results showed that in the PC the attributes related to soil acidity predominated and that the area should be delimited in three zones. The MZs delimitation using PC showed as an important tool in assisting the allocation of agricultural experiments, reducing the error arising from the heterogeneity that may occur within the experimental blocks.
  • Identification and spatialization of apple orchards using remote sensing
           data in the state of Santa Catarina-Brazil

    • Abstract: Resumo Santa Catarina possui destaque nacional no cultivo da maçã, porém atualmente os dados de área cultivada são coletados através de metodologias subjetivas. Neste sentido, o presente trabalho tem como objetivo apresentar uma metodologia de estimativa de área utilizando técnicas de sensoriamento remoto. Além disso, através de dados SRTM e meteorológicos foi realizada a espacialização de um dos fatores essenciais ao cultivo da maçã, as horas de frio (HF), a qual determina a brotação e consequentemente a produtividade dos pomares. Os resultados mostraram que por meio das imagens orbitais foi possível um mapeamento com 93,4% de índice Kappa, fato este obtido principalmente pelo uso de imagens Sentinel-2 e Cbers-4. Cerca de 73% encontram-se em uma faixa de altitude entre 1.100 e 1.400 m. Em relação às Horas de Frio, pomares implantados entre 700 e 900 HF totalizam 71,3% da área de produção. A metodologia aplicada e os resultados alcançados no presente trabalho demonstram grande potencial para o mapeamento de outras regiões produtoras de maçã no estado.Abstract Santa Catarina has national prominence in the cultivation of the apple, but currently the data of cultivated area are collected through subjective methodologies. In this sense, the present work aims to present an area estimation methodology using remote sensing techniques. In addition, through SRTM and meteorological data, the spatialization of one of the factors essential to apple cultivation, the chill hours (CH) was carried out, which determines bud break and consequently orchards productivity. Results showed that by means of orbital images a mapping with 93.4% of Kappa index was possible, fact obtained mainly by the use of Sentinel-2 and Cbers-4 images. About 73% are in an altitude range between 1,100 and 1,400 m. In relation to the Chill Hours, orchards implanted between 700 and 900 CH total 71.3% of the production area. The applied methodology and the results achieved in the present work show great potential for the mapping of other apple producing regions in the state.
  • Water deficit tolerance in genotypes of Urochloa spp.

    • Abstract: ABSTRACT It is estimated that World population will increase considerably in the coming years. Thus, there is a need to maximize the production of animal protein, of which the pasture production system is the most economical way. However, abiotic factors influence animal production, with water deficit being the factor that most limits the development of forages. This research aimed to investigate the tolerance of Urochloa spp. genotypes under periods with water deficit conditions. The experiment was carried out in a randomized block design, under a factorial design. Twelve forage genotypes were evaluated in three periods of water stress, with three replications. There was no interaction effect between the genotype factors and time of stress due to water deficit for all variables. There was a reduction in forage production with the increase of time in water restriction, and a decrease of 23% in leaf mass and 30% in stem. In the case of leaf attributes, there was a decrease of 28% in the area and 21% in the leaf length. For the genotype factor, the G11 material stood out in relation to the others for presenting better agronomic characteristics. However, studies are needed to demonstrate the superiority of this material in production systems.RESUMO Estima-se que a população mundial irá aumentar consideravelmente nos próximos anos. Diante disso, existe a necessidade de maximizar a produção de proteína animal, da qual o sistema de produção a pasto é a forma mais econômica. Porém, os fatores abióticos interferem na produção animal, em que o déficit hídrico é o fator que mais limita o desenvolvimento de forrageiras. Este estudo visou avaliar a tolerância de genótipos de Urochloa spp. sob períodos em condição de déficit hídrico. O experimento foi realizado sob delineamento experimental de blocos casualizados, em esquema fatorial. Foram avaliados 12 genótipos forrageiros em três períodos de estresse hídrico, com três repetições. Não houve efeito de interação entre os fatores genótipos e tempo de estresse por déficit hídrico para todas as variáveis. Constatou-se redução na produção de forragem com o aumento do tempo em restrição hídrica, com diminuição de 23% para massa de folhas e 30% para colmos. No caso dos atributos da folha, foi verificada redução de 28% na área e 21% no comprimento foliar. Para o fator genótipo o material G11 se destacou em relação aos demais por apresentar melhores características agronômicas. Entretanto, são necessários estudos a fim de demonstrar a superioridade desse material em sistemas de produção.
  • Effect of packaging and storage conditions on the physiological quality of
           seeds and seedlings in Myrciaria dubia

    • Abstract: ABSTRACT The study aimed to verify the physiological quality of seeds of Myrciaria dubia, stored for 300 days in different conditions and packaging, using tests of electrical conductivity and seedling vigour. The seeds were classified into three weight classes (small, medium and large). Small seeds were considered those with a weight of less than 0.84 g, medium seeds with a weight between 0.86 g and 1.20 g, and large seeds, a weight of greater than 1.22 g. The seeds were stored in glass containers and plastic pots topped up with water, in the laboratory at a room temperature of 23 to 25°C and relative humidity of 60-70%, and in a cold chamber at a temperature of 14-16°C and relative humidity of 50-60%. For each storage period (0, 30, 60, 120, 180, 240 and 300 days), a sample of 110 seeds was used for analyses, including imbibition curve, seed dry weight, electrical conductivity, seedling emergence and emergence speed index. According to the results obtained, the responses of the seeds in both the laboratory and cold-chamber, and stored in plastic pots topped up with water, were indicated for maintaining physiological quality and seedling vigour up to 300 days.RESUMO Objetivou-se verificar a qualidade fisiológica de sementes de Myrciaria dubia, armazenadas em diferentes ambientes e embalagens durante 300 dias, a partir dos testes de condutividade elétrica, e vigor das plântulas. As sementes foram armazenadas dentro de embalagem de vidro e potes plásticos com água até à superfície do recipiente, no laboratório à temperatura ambiente entre 23 a 25°C e 60-70% UR e em câmara fria à temperatura entre 14-16°C e 50-60% UR. A cada período de armazenamento (0, 30, 60, 120, 180, 240 e 300 dias), foi retirada, de cada recipiente, uma amostra de 110 sementes e submetida às seguintes avaliações: curva de embebição de água, massa seca de sementes, teste de condutividade elétrica, emergência de plantulas e índice de velocidade de emergência. De acordo com os resultados, verificou-se que o armazenamento das sementes de Myrciaria dubia em potes plásticos com água até superfície do recipiente, quer no laboratório e quer na câmara fria, foi indicado para manter a qualidade fisiológica e vigor de plântulas até 300 dias.
  • Breaking the dormancy of Momordica balsamina L. seeds by resorting to

    • Abstract: ABSTRACT The Cucurbitaceae family has some species with dormant seeds, including Momordica balsamina. Therefore, several methods have been used to overcome dormancy, as these help to accelerate the germination process. In this way, the objective was to evaluate seed germination at different temperatures after seed pre-treatments. The seed pre-treatments were: removal of the integument; wetting the substrate with 0.1% KNO3 solution; pre-cooling to 10 ºC for 3 days and control. Thereafter seeds germination temperatures were 25, 30 and 35 ºC in a BOD. Four replications of 25 seeds for each pre-treatment and temperature were used. After 21 days of the test assembly first germination count, germination, seedling emergence speed and seedling emergence were evaluated. The results showed physical seed dormancy. The removal of the tegument and the temperatures of 25 or 30 ºC, with 97 and 96% of germinated seeds respectively, provided ideal conditions for germination.RESUMO A família Cucurbitaceae, possui algumas espécies cujas sementes apresentam dormência, inclusive Momordica balsamina L. Esta característica obriga à utilização de métodos de quebra de dormência para aceleração do processo de germinação. Assim, objectivou-se avaliar a germinação das sementes a diferentes temperaturas após o pré-tratamento das mesmas. Utilizou-se um delineamento inteiramente casualizado, em esquema factorial 4x3 com quatro repetições de 25 sementes por modalidade, sendo quatro pré-tratamentos: remoção do tegumento; humedecimento do substrato com solução de KNO3 a 0,1%; pré-esfriamento a 10 ºC durante 3 dias e a testemunha e três temperaturas de germinação 25, 30 e 35ºC em câmaras do tipo BOD. Posteriormente procedeu-se à avaliação da primeira contagem de germinação, germinação, velocidade de emergência de plântulas e emergência de plântulas. Os resultados evidenciaram dormência tegumentar (física) das sementes. A remoção do tegumento e as temperaturas de 25 ou 30 ºC, com 97 e 96% de sementes germinadas respectivamente, proporcionaram condições ideais para germinação.
  • Physiological behavior of Cojoba arborea (L.) Britton & Rose
           seeds submitted to drying

    • Abstract: RESUMO O manejo de sementes recalcitrantes continua sendo um desafio sem solução e não existe um método satisfatório para manter sua viabilidade no longo prazo. O trabalho avaliou o efeito da secagem das sementes de C. arborea sobre seu comportamento fisiológico e grau de recalcitrância. Na determinação do grau de recalcitrância aplicaram-se testes germinativos em sementes com diferentes teores de umidade. O teste foi dividido em duas etapas: processo de secagem e teste de germinação. A tolerância a secagem foi determinada ao colocar as sementes sobre uma peneira com malha de 5 mm em ambiente com ar-condicionado. Ao final de cada cinco dias, foi determinado o teor de água e ainda realizado semeadura. Com os dados da germinação foram calculados índices de velocidade e tempo médio de germinação. As variáveis de porcentagem de germinação, tempo médio de germinação e vigor foram aplicadas análise de variância (ANOVA) seguida pelo teste Tukey (p < 0,05) para comparação entre as médias. As sementes foram dispersas com alto teor de umidade, 55,4%, e tiveram viabilidade e vigor comprometidos quando secas, caracterizando-as como recalcitrante. O teor de água crítico foi a partir de 23,69%, enquanto o grau de umidade letal ficou a partir de 17,99%.ABSTRACT The management of recalcitrant seeds remains an unsolved challenge and there is no satisfactory method to maintain its long-term viability. The work evaluated the effect of drying C. arborea seeds on its physiological behavior and degree of recalcitrance. In determining the degree of recalcitrance, germination tests were applied to seeds with different moisture content. The test was divided into two stages: drying process and germination test. The drying tolerance was determined by placing the seeds on a 5 mm mesh sieve in an air-conditioned environment. At the end of every five days, the water content was determined and sowing was carried out. With the germination data, speed indexes and average germination time were calculated. The variables of percentage of germination, average time of germination and vigor were applied analysis of variance (ANOVA) followed by the Tukey test (p <0.05) to compare the means. The seeds were dispersed with a high moisture content, 55.4%, and had viability and vigor compromised when dried, characterizing them as recalcitrant. The critical water content was 23.69%, while the degree of lethal humidity was 17.99%.
  • Physiological marker of phosphorus nutritional status in potato

    • Abstract: Abstract The development of more efficient plants in the use of nutrients will be fundamental for agriculture in the coming years. The objective of this work was to define a physiological marker of the nutritional status of P for potato clones cultivated soilless and in vitro, in order to facilitate the selection process of more efficient clones in the use of P. For this, two experiments were carried out with seven potato clones (SMIC 148-A, Dakota Rose, SMINIA 793101-3, SMIB 106-7, SMIF 212-3, SMIJ 319-1 and P 150) grown at two levels of P (low and high) in the culture systems in vitro (1.935 and 19.346mg P L-1) and in soilless (2.32 and 23.2mg P L-1) using sand as substrate. The inorganic P content and the total accumulation of P in shoot and roots seem to be good indicators of the nutritional status of P in potato plants, both in soilless and in vitro cultivation. The activity of the acidic phosphatase enzymes (APases) in the tissues of the potato depends very much on the culture system, the clone and the organ of the analyzed plant, making it difficult to choose it as a physiological marker for restriction of P in potatoes. The dry mass of the potato plant may be a good indicator of the nutritional status of P in clones grown soilless.Resumo O desenvolvimento de plantas mais eficientes no uso de nutrientes será fundamental para a agricultura nos próximos anos. O objetivo deste trabalho foi definir um marcador fisiológico do status nutricional do P para clones de batata cultivados fora do solo e in vitro, visando facilitar o processo de seleção de clones mais eficientes no uso de P. Para tanto, foram realizados dois experimentos com sete clones de batata (SMIC 148-A, Dakota Rose, SMINIA 793101-3, SMIB 106-7, SMIF 212-3, SMIJ 319-1 e P 150) cultivados em dois níveis de P (baixo e alto) no sistema de cultivo in vitro (1,935 e 19,346mg P L-1) e no cultivo fora do solo (2,32 e 23,2mg P L-1) usando areia como substrato. O teor de P inorgânico e a acumulação total de P na parte aérea e nas raízes parecem ser bons indicadores da condição nutricional de P em plantas de batata, tanto no cultivo fora do solo quanto no in vitro. A atividade das enzimas fosfatases ácidas (APases) nos tecidos da batata depende muito do sistema de cultivo, do clone e do órgão da planta analisado, dificultando a escolha deste como um marcador fisiológico para restrição de P em batata. A massa seca da planta de batata pode ser um bom indicador do status nutricional do P em clones cultivados fora do solo.
  • Bacillus sp. as a growth promoter in soy

    • Abstract: Resumo As rizobactérias promotoras de crescimento em plantas tem ganho interesse espaço na agricultura mundial, como uma alternativa ao uso de defensivos agrícolas químicos. A soja, por ser um dos principais grãos exportados pelo Brasil, merece destaque em estudos deste âmbito. Desta forma, sementes de soja (Glycine max (L.) Merr.) foram inoculadas com Bacillus sp. objetivando-se avaliar a viabilidade desta rizobactéria como promotora de crescimento vegetal. Foram testados quatro tratamentos com diferentes doses de inoculante à base de Bacillus sp.: 100, 200, 300 e 400 mL de inoculante para 50 kg de sementes, com uma concentração de 1x108 UFC mL-1, mais uma testemunha sem inoculação. As avaliações foram feitas aos 30 e 45 dias após a semeadura (DAS). Aos 45 DAS, a altura da planta, comprimento radicular, massa seca da parte aérea, massa seca radicular e massa seca total foram estatisticamente superiores para todas as doses de inoculante aplicadas, quando comparadas à testemunha. O número de entrenós também aumentou significativamente nas diferentes doses de inoculante utilizadas, em comparação ao tratamento testemunha. A inoculação de sementes com Bacillus sp. apresentou-se como uma alternativa viável para promoção de crescimento em plantas de soja.Abstract Plant-growth promoting rhizobacteria have been gaining interest in agriculture worldwide as an alternative to the use of chemical pesticides. Soybean, being one of the main grains exported by Brazil, deserves attention in studies of this scope. Thus, soybean seeds (Glycine max (L.) Merr.) were inoculated with Bacillus sp. aiming to evaluate the viability of this rhizobacteria as a plant growth promoter. Four treatments with different doses of Bacillus sp. inoculant were tested: 100, 200, 300 and 400 mL of inoculant for 50 kg of seeds, with a concentration of 1x108 CFU mL-1, plus one control without inoculation. The evaluations were made at 30 and 45 days after seedling (DAS). At 45 DAS, plant height, root length, shoot dry mass, root dry mass and total dry mass were statistically higher for all applied doses when compared to the control. The number of internodes also increased significantly in the different doses used, compared to control treatment. Inoculation of seeds with Bacillus sp. was a viable alternative for growth promotion in soybean plants.
  • Record of Lusura chera (Drury, 1773) (Lepidoptera: Notodontidae) in Brazil
           nut tree in municipality of Xapuri, Acre state, Southwestern Brazilian

    • Abstract: RESUMO Neste trabalho registra-se um surto populacional de Lusura chera (Drury, 1773) (Lepidoptera: Notodontidae) em castanheira-do-Brasil no município de Xapuri, estado do Acre, sudoeste da Amazônia brasileira. Foi observada uma desfolha acima de 50% nas árvores infestadas, demonstrando o potencial danoso do inseto nesta planta hospedeira.ABSTRACT In this work, a population outbreak of Lusura chera (Drury, 1773) (Lepidoptera: Notodontidae) is recorded in Brazil nut trees in the municipality of Xapuri, Acre state, Southwestern Brazilian Amazon. Defoliation of more than 50% was observed in the infested trees, demonstrating the harmful potential of the insect in this host plant.
  • Vegetable powders for the control of Sitophilus zeamais (Motschulsky)
           (Coleoptera: Curculionidae) in stored maize grains

    • Abstract: Abstract The attack by insects is one of the main causes of losses on maize during storage. The purpose of this research was to investigate the insecticidal potential action of Urtica urens L. and Piper aduncum L. powders on the maize weevils Sitophilus zeamais (Motschulsky) on stored maize. The experiment was carried out in the laboratory, with evaluation of the dry powder of U. urens leaves and P. aduncum at 3 %, and control without powder, in 80 g of maize grains infested with 0, 8, 16 and 24 maize weevil individuals. A completely randomized design was used on a 4x3 factorial scheme with four replications. The experiment was evaluated after 50 days of storage by: reduction of grain weight, percentage of grain damaged by maize weevils, grain moisture content, number of adult emerged maize weevil and mortality of maize weevil. The application of powders of P. aduncum and U. urens reduced significantly the grain damaged by S. zeamais. P. aduncum also caused a significant reduction of grain weight loss, of the number of adult emerged maize weevil and of increased the percentage of dead maize weevil. The powder of P. aduncum showed to be promising for the control of S. zeamais in stored maize grains.Resumo Uma das principais causas de perdas na produção de grãos de milho é devido ao ataque de insetos durante seu armazenamento. Objetivou-se nesse trabalho investigar o potencial de ação inseticida de pós de Urtica urens L. e Piper aduncum L. sobre gorgulhos Sitophilus zeamais (Motschulsky) em grãos de milho. O ensaio foi realizado em laboratório, avaliando pós secos de folhas de U. urens e de P. aduncum a 3 %, em 80 g de grãos de milho infestados com 0, 8, 16 e 24 gorgulhos. Utilizou-se delineamento experimental completamente casualizado em esquema fatorial 4x3 com quatro repetições. O ensaio foi avaliado após 50 dias de armazenamento, por meio de: redução do peso dos grãos, porcentagem de grãos danificados pela ação dos gorgulhos, teor de água dos grãos, número de gorgulhos adultos emergidos e porcentagem de gorgulhos mortos. A aplicação de pós de P. aduncum e U. urens reduziu significativamente a percentagem de grãos danificados por S. zeamais. P. aduncum reduziu significativamente a perda de peso de grãos, o número de gorgulhos adultos emergidos e aumentou a mortalidade do gorgulho. Assim, o pó de P. aduncum mostrou ser promissor para o controle de S. zeamais em grãos de milho armazenados.
  • Sanitary quality of cooled and stored soybean seeds: incidence of fungal
           species in stored soybean seeds in relation to cooling before packing and
           to packaging material

    • Abstract: ABSTRACT Maintaining seed quality during storage is a fundamental premise for production efficiency. The aim of this work was to evaluate the effect of cooling prior to packing seeds and of types of packaging on the occurrence of fungal species and the oscillations of these fungal populations over the storage period of soybean seeds. A completely randomized experimental design was used with four replications in a 2×3×5 factorial arrangement, consisting of cooling or no cooling of the seed mass before packing, three types of packaging materials, and five moments of evaluation during storage. Sanitary quality was evaluated by the method of incubation in filter paper without freezing. The seed mass cooled to 13°C prior to packing returned to ambient temperature in 15 days in a warehouse without controlled conditions. Cooling prior to packing does not affect the sanitary quality of soybean seeds during storage, whereas the type of packaging material does have an effect. The incidence of Phomopsis spp. and Fusarium spp. at the beginning of storage was lower mainly for seeds stored in the high-density polyethylene (HDPE) container. The occurrence of Cercospora kikuchii in both packaging types decreases over storage time. In all the packaging, the incidence of Aspergillus spp. and Penicillium spp. increases along the storage period.RESUMO A manutenção da qualidade das sementes durante o armazenamento é premissa básica à eficiência produtiva. O objetivo deste trabalho foi avaliar o efeito da refrigeração no pré-embalamento das sementes e dos tipos de embalagem sobre a ocorrência de espécies fúngicas e as oscilações dessas populações ao longo do armazenamento de sementes de soja. Utilizou-se o delineamento experimental inteiramente casualizado com quatro repetições, em arranjo fatorial 2x3x5 envolvendo ou não a refrigeração da massa de sementes antes do embalamento, três tipos de embalagens e cinco períodos de armazenamento. A qualidade sanitária foi avaliada por meio do método de incubação em papel de filtro sem congelamento. A massa de sementes resfriadas a 13°C no pré-embalamento retorna à temperatura ambiente em 15 dias, em armazém com condições não controladas. O resfriamento no pré-envase não influencia na qualidade sanitária das sementes de soja durante o armazenamento, já a embalagem afeta. Ocorreram reduções na incidência de Phomopsis spp. e de Fusarium spp. no início do armazenamento, principalmente para sementes armazenadas em contêiner de polietileno (PEAD). A ocorrência de Cercospora kikuchii em ambos tipos de embalagem decresceu ao longo do armazenamento. Em todas as embalagens, as incidências de Aspergillus spp. e de Penicillium spp. aumentam ao longo do período de armazenamento.
  • Molecular factors in the fundamental metabolism of Phytophthora

    • Abstract: Resumo Phytophthora cinnamomi é um Oomiceta diploide que vive no solo e é o causador da morte de inúmeras plantas em todo o mundo. Em Portugal a produção de castanheiro europeu encontra-se sobretudo na região norte onde mais de 80% está concentrada principalmente na região de Trás-os-Montes, tornando-se uma fonte económica muito valiosa para a região. A doença da tinta do castanheiro europeu é uma patologia causada principalmente por P. cinnamomi e representa uma ameaça para a preservação do castanheiro europeu (Castanea sativa Miller). O principal objetivo deste trabalho é a identificação de genes que expressam proteínas relacionadas com o metabolismo fundamental de P. cinnamomi, através da utilização de ferramentas bioinformáticas. O genoma deste microrganismo encontra-se depositado na base de dados biológicos NCBI (National Center for Biotechnology Information) e através das sequências desse genoma foram identificadas as ORFs (open reading frames - fases de leitura aberta) que codifiquem para proteínas associadas ao metabolismo fundamental. Com ferramentas bioinformáticas conseguimos ainda predizer a localização subcelular, a estrutura tridimensional, as características físico-químicas e a caracterização dos domínios dessas proteínas.Abstract Phytophthora cinnamomi is a diploid Oomycete that lives in the soil and is the cause of the death of countless plants worldwide. In Portugal the production of European chestnut is found mainly in the northern region where more than 80% is concentrated mainly in the region of Trás-os-Montes, making it a very valuable economic source for the region. European chestnut ink disease is a pathology caused mainly by P. cinnamomi and poses a threat to the preservation of chestnut (Castanea sativa Miller). The main objective of this work is the identification of genes that express proteins related to the fundamental metabolism of P. cinnamomi, using bioinformatics tools. The genome of this microorganism is deposited in the biological database NCBI (National Center for Biotechnology Information) and through the sequences of this genome, ORFs (open reading frames) that code for proteins associated with fundamental metabolism were identified. With bioinformatics tools we can also predict the subcellular location, the three-dimensional structure, the physical-chemical characteristics and the characterization of the domains of these proteins.
  • Distribution and chemical composition of crystals in wood of Hevea
           brasiliensis (Willd. ex Adr Jussieu) Muell. Arg.

    • Abstract: Abstract In order to understand the intraspecific changes that occur in the rubber tree wood from São Paulo and Paraná (Brazil), the distribution and the chemical composition of crystals were investigated by morphological and chemical analyses using scanning electron microscopy and energy-dispersive X-ray spectrometry, respectively. Prismatic calcium oxalate crystals were frequently found in vessels and in parenchyma cells of both sites. The findings of this study suggest that crystals may be associated with the beginning of growth and also highlights the need for further investigations about soil nutrient to compare with crystal content found in Hevea brasiliensis wood.Resumo A fim de compreender as mudanças intraespecíficas que ocorrem na madeira da seringueira de São Paulo e do Paraná (Brasil), a distribuição e a composição química dos cristais foram investigadas por meio de análises morfológicas e químicas por microscopia eletrônica de varredura e espectrometria de raios-X por dispersão de energia, respectivamente. Cristais de oxalato de cálcio foram frequentemente encontrados nos vasos e nas células do parênquima em ambos os locais. Os resultados deste estudo sugerem que os cristais podem estar associados ao início do crescimento, além disso, destaca-se a necessidade de realizar investigações sobre os nutrientes do solo para comparar com o conteúdo de cristal encontrado na madeira de Hevea brasiliensis.
  • Fish hams. Color preference and acceptability

    • Abstract: Resumo Foram preparados fiambres de corvina para se estudar a preferência do consumidor relativamente ao tipo de fiambre e, em particular, à sua cor. As cores dos fiambres foram manipuladas pela adição individual e em diferentes proporções de pigmento de cochonilha (tons vermelhos), Fibricolor (tons rosa) e Instanka sugar powder 75/700 (tons castanhos). Fotografias das amostras serviram de base para a criação de um inquérito “on line”. Neste inquérito, além de se procurar perceber o perfil do inquirido e dos seus hábitos alimentares, solicitou-se a escolha das cores expectáveis ou mais atraentes para um fiambre de peixe. Do total de 2237 inquiridos, cerca de 78 % apresentaram idades compreendidas entre os 44 anos ou menos, evidenciando-se nestes o bacharelato ou licenciatura como grau de formação. Quanto ao consumo de fiambre, o género feminino evidenciou preferência pelo fiambre de peru e o género masculino pelo fiambre de porco. A frequência de consumo de fiambre e de peixe foi semelhante, “3x por semana”. Mais de metade dos inquiridos (55%) respondeu “não sei” à possível compra de fiambre de peixe. O fiambre de corvina preparado com 0,0005 % de cochonilha, cuja cor foi muito semelhante à do fiambre de corvina sem corante, teve uma boa aceitabilidade por parte dos inquiridos.Abstract To study the consumer preference regarding the color of fish hams, cooked hams with meagre were prepared. The colors of the hams were manipulated by the individual addition and in different proportions of cochineal pigment (red tones), Fibricolor (pink tones) and Instanka sugar powder 75/700 (brown tones). Photographs of the samples served as the basis for the creation of an online survey. In this survey, in addition to seeking to understand the profile of the respondent and their eating habits, it was requested to choose the expected or most attractive colors of a fish cooked ham. Of the total of 2237 respondents, about 78% were aged between 44 years old and under, showing a Higher Education Degree as a degree of training. Regarding the consumption of cooked ham, the female gender showed a preference for turkey cooked ham and the male gender for pig cooked ham. The frequency of consumption of cooked ham and fish was similar, “3x a week”. More than half of respondents (55%) answered “I don't know” when faced with the possible purchase of fish ham. It was concluded that a winter meagre cooked ham prepared with 0.0005% cochineal, whose color was very similar to that of the meagre cooked ham without dye, had a good acceptance by the respondents.
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
Tel: +00 44 (0)131 4513762

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