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  Subjects -> AGRICULTURE (Total: 779 journals)
    - AGRICULTURAL ECONOMICS (77 journals)
    - AGRICULTURE (527 journals)
    - CROP PRODUCTION AND SOIL (92 journals)
    - DAIRYING AND DAIRY PRODUCTS (31 journals)
    - POULTRY AND LIVESTOCK (52 journals)

AGRICULTURE (527 journals)                  1 2 3 | Last

Showing 1 - 200 of 263 Journals sorted alphabetically
Aceh International Journal of Science and Technology     Open Access   (Followers: 1)
Acta agriculturae Slovenica     Open Access   (Followers: 3)
Acta Agronomica Hungarica     Full-text available via subscription   (Followers: 1)
Acta Agronomica Sinica     Full-text available via subscription   (Followers: 5)
Acta Scientiarum. Animal Sciences     Open Access   (Followers: 1)
Acta Scientiarum. Technology     Open Access  
Acta Technologica Agriculturae     Open Access   (Followers: 1)
Acta Universitatis Sapientiae, Alimentaria     Open Access  
Advances in Agriculture     Open Access   (Followers: 2)
Advances in Agriculture & Botanics     Open Access   (Followers: 9)
Advances in Agronomy     Full-text available via subscription   (Followers: 12)
Advances in Life Science and Technology     Open Access   (Followers: 9)
AFBM Journal     Open Access  
Africa Research Bulletin: Political, Social and Cultural Series     Hybrid Journal   (Followers: 9)
African Journal of Agricultural Research     Open Access   (Followers: 3)
African Journal of Food Science     Open Access   (Followers: 3)
African Journal of Food, Agriculture, Nutrition and Development     Open Access   (Followers: 12)
African Journal of Range & Forage Science     Hybrid Journal   (Followers: 5)
Agra Europe     Full-text available via subscription   (Followers: 3)
Agribusiness : an International Journal     Hybrid Journal   (Followers: 7)
Agricultura Tecnica     Open Access   (Followers: 6)
Agricultura Tropica et Subtropica     Open Access   (Followers: 1)
Agricultura, Sociedad y Desarrollo     Open Access  
Agricultural Advances     Open Access   (Followers: 3)
Agricultural and Food Science     Open Access   (Followers: 15)
Agricultural Commodities     Full-text available via subscription  
Agricultural Economics     Hybrid Journal   (Followers: 43)
Agricultural History Review     Full-text available via subscription   (Followers: 5)
Agricultural Research     Hybrid Journal   (Followers: 3)
Agricultural Science     Full-text available via subscription   (Followers: 4)
Agricultural Science     Open Access   (Followers: 1)
Agricultural Sciences     Open Access   (Followers: 7)
Agricultural Sciences in China     Full-text available via subscription   (Followers: 3)
Agricultural Systems     Hybrid Journal   (Followers: 24)
Agricultural Water Management     Hybrid Journal   (Followers: 22)
Agriculture     Open Access   (Followers: 4)
Agriculture & Food Security     Open Access   (Followers: 7)
Agriculture (Poľnohospodárstvo)     Open Access   (Followers: 1)
Agriculture and Agricultural Science Procedia     Open Access  
Agriculture and Food Sciences Research     Open Access  
Agriculture and Human Values     Hybrid Journal   (Followers: 12)
Agriculture, Ecosystems & Environment     Hybrid Journal   (Followers: 43)
Agriprobe     Full-text available via subscription  
Agrivita : Journal of Agricultural Science     Open Access   (Followers: 2)
Agro-Science     Full-text available via subscription  
Agroalimentaria     Open Access  
Agrociencia     Open Access   (Followers: 1)
Agrociencia Uruguay     Open Access  
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 2)
Agrokreatif Jurnal Ilmiah Pengabdian kepada Masyarakat     Open Access  
Agronomía Colombiana     Open Access  
Agronomía Costarricense     Open Access   (Followers: 1)
Agronomía Mesoamericana     Open Access  
Agronomie Africaine     Full-text available via subscription  
Agronomy     Open Access   (Followers: 8)
Agrosearch     Open Access   (Followers: 1)
Akademik Ziraat Dergisi     Open Access  
Alinteri Zirai Bilimler Dergisi : Alinteri Journal of Agricultural Sciences     Open Access  
Ambiente & Agua : An Interdisciplinary Journal of Applied Science     Open Access   (Followers: 1)
American Journal of Agricultural and Biological Sciences     Open Access   (Followers: 10)
American Journal of Botany     Full-text available via subscription   (Followers: 14)
American Journal of Economics and Sociology     Hybrid Journal   (Followers: 26)
American Journal of Potato Research     Hybrid Journal   (Followers: 2)
American Journal of Rural Development     Open Access   (Followers: 3)
Anais da Academia Brasileira de Ciências     Open Access   (Followers: 2)
Annales des Sciences Agronomiques     Full-text available via subscription  
Annals of Agricultural and Environmental Medicine     Open Access   (Followers: 1)
Annals of Agricultural Sciences     Open Access   (Followers: 1)
Annals of Silvicultural Research     Open Access   (Followers: 1)
Annual Review of Resource Economics     Full-text available via subscription   (Followers: 10)
APCBEE Procedia     Partially Free   (Followers: 1)
Applied Economics Letters     Hybrid Journal   (Followers: 24)
Applied Financial Economics Letters     Hybrid Journal   (Followers: 7)
Arboricultural Journal : The International Journal of Urban Forestry     Hybrid Journal   (Followers: 6)
Archivos de Zootecnia     Open Access   (Followers: 1)
Arquivos do Instituto Biológico     Open Access   (Followers: 1)
Arthropod-Plant Interactions     Hybrid Journal   (Followers: 1)
Asian Economic Papers     Hybrid Journal   (Followers: 4)
Asian Journal of Agricultural Research     Open Access   (Followers: 3)
Asian Journal of Medical and Biological Research     Open Access   (Followers: 1)
Asian Journal of Plant Sciences     Open Access   (Followers: 1)
Australian Cottongrower, The     Full-text available via subscription   (Followers: 1)
Australian Economic Papers     Hybrid Journal   (Followers: 8)
Australian Economic Review     Hybrid Journal   (Followers: 7)
Australian Forest Grower     Full-text available via subscription   (Followers: 2)
Australian Forestry     Full-text available via subscription   (Followers: 2)
Australian Grain     Full-text available via subscription   (Followers: 3)
Australian Holstein Journal     Full-text available via subscription  
Australian Journal of Agricultural and Resource Economics     Hybrid Journal   (Followers: 3)
Australian Journal of Agricultural Engineering     Open Access   (Followers: 1)
Australian Sugarcane     Full-text available via subscription  
Avances en Investigacion Agropecuaria     Open Access   (Followers: 1)
B.E. Journal of Theoretical Economics     Full-text available via subscription  
Bangladesh Agronomy Journal     Open Access  
Bangladesh Journal of Agricultural Research     Open Access   (Followers: 1)
Bangladesh Journal of Scientific Research     Open Access  
Bioagro     Open Access  
Biocatalysis and Agricultural Biotechnology     Hybrid Journal   (Followers: 3)
Biocontrol Science and Technology     Hybrid Journal   (Followers: 6)
Biodiversity     Hybrid Journal   (Followers: 21)
Biodiversity : Research and Conservation     Open Access   (Followers: 23)
Biological Agriculture & Horticulture : An International Journal for Sustainable Production Systems     Partially Free   (Followers: 10)
Biosystems Engineering     Hybrid Journal   (Followers: 4)
Biotemas     Open Access  
Boletín Semillas Ambientales     Open Access  
Bragantia     Open Access   (Followers: 2)
Brazilian Archives of Biology and Technology     Open Access   (Followers: 1)
British Poultry Science     Hybrid Journal   (Followers: 5)
Buletin Peternakan : Bulletin of Animal Science     Full-text available via subscription  
Buletin Veteriner Udayana     Open Access  
Bulletin of University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca : Food Science and Technology     Open Access  
California Agriculture     Open Access  
Cambridge Journal of Economics     Hybrid Journal   (Followers: 39)
Canadian Water Resources Journal     Hybrid Journal   (Followers: 17)
Capitalism Nature Socialism     Hybrid Journal   (Followers: 11)
Ceiba     Open Access  
Cereal Chemistry     Full-text available via subscription   (Followers: 4)
CERNE     Open Access  
CESifo Economic Studies     Hybrid Journal   (Followers: 7)
Change and Adaptation in Socio-Ecological Systems     Open Access   (Followers: 1)
Chemical and Biological Technologies for Agriculture     Open Access  
Chilean Journal of Agricultural Research     Open Access   (Followers: 1)
Ciencia & Natura     Open Access  
Ciência e Agrotecnologia     Open Access  
Ciencia e investigación agraria     Open Access  
Ciência e Técnica Vitivinícola     Open Access  
Ciencia forestal en México     Open Access  
Ciência Rural     Open Access   (Followers: 1)
Ciencia y Agricultura     Open Access  
COCOS : The Journal of the Coconut Research Institute of Sri Lanka     Open Access   (Followers: 1)
Coffee Science     Open Access  
Cogent Food & Agriculture     Open Access  
Competition & Change     Hybrid Journal   (Followers: 9)
Computers and Electronics in Agriculture     Hybrid Journal   (Followers: 2)
Contributions to Tobacco Research     Open Access   (Followers: 1)
Corps et culture     Open Access   (Followers: 5)
Cuadernos de Desarrollo Rural     Open Access   (Followers: 1)
Cultivos Tropicales     Open Access  
Cultural Geographies     Hybrid Journal   (Followers: 16)
Cultural Sociology     Hybrid Journal   (Followers: 27)
Cultural Studies - Critical Methodologies     Hybrid Journal   (Followers: 14)
Cultural Studies of Science Education     Hybrid Journal   (Followers: 5)
Cultural Trends     Hybrid Journal   (Followers: 13)
Culture & Agriculture     Hybrid Journal   (Followers: 10)
Culture, Agriculture, Food and Environment     Hybrid Journal   (Followers: 5)
Current Life Sciences     Open Access   (Followers: 2)
Current Research in Dairy Sciences     Open Access   (Followers: 5)
Dairy Mail Africa : Publication for the Dairy Industry in Africa     Full-text available via subscription   (Followers: 2)
Derim     Open Access  
Developments in Agricultural Economics     Full-text available via subscription   (Followers: 4)
Developments in Agricultural Engineering     Full-text available via subscription  
Diatom Research     Hybrid Journal  
Die Bodenkultur : Journal of Land Management, Food and Environment     Open Access  
Dossiers Agraris     Open Access  
Ecological Applications     Full-text available via subscription   (Followers: 116)
Economic Affairs     Hybrid Journal   (Followers: 6)
Economic and Industrial Democracy     Hybrid Journal   (Followers: 6)
Economic Bulletin     Hybrid Journal   (Followers: 4)
Economic Policy     Hybrid Journal   (Followers: 23)
Economic Record     Hybrid Journal   (Followers: 4)
Empirical Economics     Hybrid Journal   (Followers: 8)
Encuentro     Open Access  
Engineering in Agriculture, Environment and Food     Hybrid Journal  
Ensaios e Ciência: Ciências Biológicas, Agrárias e da Saúde     Open Access  
Environment and Development Economics     Hybrid Journal   (Followers: 26)
Eppo Bulletin     Hybrid Journal   (Followers: 2)
Ethology     Hybrid Journal   (Followers: 6)
EU agrarian Law     Open Access   (Followers: 3)
Euphytica     Hybrid Journal   (Followers: 7)
Eurochoices     Hybrid Journal   (Followers: 1)
European Agrophysical Journal     Open Access  
European Journal of Agronomy     Hybrid Journal   (Followers: 9)
European Journal of American Culture     Hybrid Journal   (Followers: 2)
European Journal of Health Economics     Hybrid Journal   (Followers: 17)
European Journal of Law and Economics     Hybrid Journal   (Followers: 62)
European Review of Agricultural Economics     Hybrid Journal   (Followers: 10)
EvoDevo     Open Access   (Followers: 1)
Extensão Rural     Open Access  
Farmer’s Weekly     Full-text available via subscription  
Farmlink Africa     Full-text available via subscription  
Fitosanidad     Open Access  
Folia Horticulturae     Open Access   (Followers: 1)
Food and Agricultural Immunology     Hybrid Journal   (Followers: 2)
Food and Energy Security     Open Access   (Followers: 4)
Food Biotechnology     Hybrid Journal   (Followers: 11)
Food Economics - Acta Agriculturae Scandinavica, Section C     Hybrid Journal   (Followers: 2)
Food New Zealand     Full-text available via subscription   (Followers: 3)
Food Policy     Hybrid Journal   (Followers: 27)
Forestry Chronicle     Full-text available via subscription   (Followers: 10)
Forum for Health Economics & Policy     Hybrid Journal   (Followers: 7)
Frontiers in Science     Open Access   (Followers: 1)
Frontiers of Agriculture in China     Hybrid Journal   (Followers: 2)
Future of Food : Journal on Food, Agriculture and Society     Open Access   (Followers: 1)
Geoderma     Hybrid Journal   (Followers: 8)
Ghana Journal of Agricultural Science     Full-text available via subscription   (Followers: 2)
Global Approaches to Extension Practice : A Journal of Agricultural Extension     Full-text available via subscription  
Global Economic Review     Hybrid Journal   (Followers: 6)
Global Journal of Agricultural Sciences     Full-text available via subscription  
Hacquetia     Open Access  
Handbook of Agricultural Economics     Full-text available via subscription   (Followers: 4)

        1 2 3 | Last

Journal Cover American Journal of Potato Research
  [SJR: 0.519]   [H-I: 29]   [2 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1874-9380 - ISSN (Online) 1099-209X
   Published by Springer-Verlag Homepage  [2335 journals]
  • Growing Potato Profitably for Organic Dry Matter Production in Western
           Nebraska
    • Abstract: Abstract Growing potato conventionally for dehydration is not economically feasible. The key cost would be seed under organic farming. The objective is to identify seed-piece sizes and spacings producing a profitable return for potato dehydration in western Nebraska. Atlantic potatoes were grown under dryland conditions using organic practices. Rain was 205, 270, and 360 mm in 2013, 2014, and 2015. Seed-pieces were hand-cut into five weights from 42.5 to 85.0 g and planted in five spacings from 15.2 to 45.7 cm. Seeding rates were 1.02 to 6.1 Mg/ha. Yield was highest at the spacing of 15.2 cm (16.1 Mg/ha) and decreased to 12.4 Mg/ha when seed-pieces were planted at 38.1 and 45.7 cm apart. Seed-piece size had little effect except that yield was lowest with 42.5 g pieces at 13.2 Mg/ha and increased to 14.2 Mg/ha with 63.8 g and larger. Specific gravity decreased slightly when pieces were spaced 30.5 cm (1.092) compared to 15.2 cm (1.094). Seed size had no effect. The size and spacing combinations with the highest yield were not found to be economical due to higher seed cost. Planting seed-pieces weighing 56.7 g, and planted 38.1 and 45.7 cm apart in 91 cm rows were economically feasible for dry matter production. The net returns, taking into account seed cost, transportation, and operations, for this combination was $326/ha, greater than for dryland winter wheat and millet. This study showed that western Nebraska would be a good location to grow dryland potatoes for organic dry matter production.
      PubDate: 2016-06-22
       
  • Genome-Wide Analyses of Subtilisin-Like Serine Proteases on Solanum
           tuberosum
    • Abstract: Abstract Plant subtilisin-like serine proteases or subtilases constitute a large expanded gene subfamily in potato. We identified 82 potato subtilases encoded by 74 genes. All subtilases present a characteristic S08 domain, and the majority of them have an association protein domain, an inhibition_I9 domain and a signal peptide that consists of a signal sequence for targeting to the secretory pathway. Phylogenetic studies revealed five subtilase groups named StSBT1 to StSBT5. A genome expansion of potato subtilase subfamily was reflected in two phylogenetic clusters, StSBT1 and StSBT4 both characterized by intronless genes in tandem arrays mainly in chromosome I and VIII. Twenty nine of the identified subtilases co-localize with six out of 24 metaQTLs related to late blight resistance previously described in potato. These metaQTLs includes subtilase genes up regulated in detached potato leaves inoculated with P. infestans, some of which are homologous to p69 subtilases genes from tomato.
      PubDate: 2016-06-10
       
  • A Historical Look at Russet Burbank Potato ( Solanum tuberosum L.) Quality
           Under Different Storage Regimes
    • Abstract: Abstract Russet Burbank is the predominant potato (Solanum tuberosum L.) cultivar grown and stored for fresh market and frozen processing (French fry) use in North America. Multi-year assessments of potato tuber quality under different storage regimes can provide information about a cultivar’s ability to retain process quality when challenged with seasonal variations across multiple years. The objective of a 15-year study initiated in 1999 was to evaluate the quality of Russet Burbank tubers grown and stored at the Kimberly Research and Extension Center. Potatoes were measured for specific gravity at harvest and stored for eight months under three temperatures (5.6, 7.2 and 8.9 °C) and periodically sampled throughout the storage season to determine dormancy length, sugar content, fry color and mottling severity (a quality issue), and weight loss. The year in which the crop was grown significantly (p < 0.001) affected all quality characteristics except specific gravity (average ranged between 1.071 and 1.081). Tubers held during the 2011–2012 and 2013–2014 storage seasons exhibited generally higher glucose, darker fry color, more severe mottling, and higher weight loss. Average sucrose content at 7.2 °C and 8.9 °C across the 15 years significantly decreased over the eight-month storage while average glucose content remained consistent after first month of storage. Average percent weight loss across the 15 years was 6.1 % after eight months in storage. This 15-year study emphasized that variation of post-harvest storage quality from year to year was likely a result of variable seasonal growing conditions. Storage temperatures between 7.2 and 8.9 °C were the optimum range for storing fry processing Russet Burbank potatoes and the warmer temperature of 8.9 °C appears to ameliorate the seasonal effects on glucose content and fry color to maintain better processing quality throughout storage.
      PubDate: 2016-06-06
       
  • The Adoption of Cv. Igorota in the Philippines and Vietnam
    • Abstract: Abstract Igorota (also known as PO3) is a high yielding potato cultivar with durable resistance to LB (Phytophthora infestans (Mont.) De Bary), resistance to PVY and PLRV, tolerant to heavy rain and good adaptation to growing conditions in the tropical highlands. Igorota is a result of intercrossing poorly adapted but highly LB resistant Solanum tuberosum ssp. Andigena clones obtained from the International Potato Center (CIP), Lima, Peru in 1986. Igorota is a seedling, selected at La Trindad, Benguet, the Philippines in 1988. Igorota, as second clonal generation rooted cuttings, was grown in an experiment with 46 other entries in 1989 in which it was the highest yielder with 26.5 tons/ha and showed high level of LB resistance. From the 3rd clonal generation, it was also evaluated by farmers, who soon saw its potential. Igorota has excellent vegetative growth, medium maturity in both the wet season and dry seasons. Igorota was officially registered in the Philippines in 1997 and in Vietnam in 2004. At present, Igorota covers around 70 % of the total highland potato production area of 11,000 ha in the Philippines and also 60 % of the total area of 1200 ha in Lamdong, Vietnam. Igorota continues to have durable resistance to LB in extremely high LB pressure environments. Igorota is conducive to rapid multiplication by apical shoot cutting farmer multipliers, who supply the demand for planting material in both countries.
      PubDate: 2016-06-01
       
  • Effect of Light Quality on the Expression of Glycoalkaloid Biosynthetic
           Genes Contributing to Steroidal Glycoalkaloid Accumulation in Potato
    • Abstract: Abstract Light quality and intensity have severe impact on Steroidal glycoalkaloid (SGA) biosynthesis, causing the quality degradation of potato by greening and accelerating SGA-induced toxicity. In this study, Atlantic and Haryoung cultivars responded differently when exposed to seven light qualities viz., purple, red, blue, green, yellow, UV and fluorescent lights. Haryoung tuber exhibited a 44 % lesser SGA accumulation in yellow light compared to fluorescent light. Further screening of selected light sources by investigating the expression pattern of key genes and SGA contents, showed lower transcript levels of key genes in yellow light which in-turn reflected in the least amount of SGA accumulation with a 22 % lesser SGA levels in yellow light compared to fluorescent light. This suppression in the SGA accumulation suggests that yellow light can be used as an alternative light source instead of fluorescent light which would help in minimizing the quality degradation and SGA- induced toxicity.
      PubDate: 2016-06-01
       
  • In-canopy Environment of Sprinkler Irrigated Potato Fields as a Factor for
           Late Blight Management in the Semiarid Environment of the Columbia Basin
    • Abstract: Abstract Relative humidity (RH), leaf wetness and temperature were quantitatively characterized within potato crop canopies and their potential effect on late blight development was estimated in commercial potato fields under sprinkler irrigation in the Columbia Basin in 1993, 1994, 1996, 2004, and 2013. Humid periods of relative humidity > 90 % for 10 or more hours per day with mean temperatures favorable of late blight development were not observed prior to canopy closure. However, at and after canopy closure, a total of 34 of 54 (62.9 %) weeks summed over 5 fields during 1993, 1994, 1996, and 2004 had humid periods favorable for late blight development when considering 10 h humid periods, and a total of 47 of 54 (87 %) weeks had late blight favorable periods when considering 12 h humid periods. In 2013, the mean number of days per week after canopy closure from four sites ranged from 0 to 5.5 days when RH was > 90 % for at least 10 h per day, ranged from 0 to 4.3 days when RH was > 90 % for at least 12 h per day, ranged from 0 to 3.0 days when RH was > 90 % for at least 14 h per day, and ranged from 0 to 2.0 days when RH was > 90 % for at least 16 h per day. Daily hours of contiguous RH > 90 % varied between mid- and low-canopy levels, monitoring sites within fields and between fields. Daily humid periods favorable for late blight development were frequent in June at mid- and low-canopy levels and continued intermittently in July and August in 2 of 2 fields in 2013. Mean temperatures after row closure were generally favorable for late blight development during the humid periods and were > 7.2 °C in June and > 12.2 °C in July and August. Number of rainy days per week and weeks with long periods of RH > 90 % within the potato canopy was significantly correlated, indicating that rare rain events in a semi-arid environment promote long periods of RH in irrigated fields. However, favorable late blight periods occurred without rain and were a factor of sprinkler irrigation. Canopy and ambient relative humidity and temperatures were highly associated, and the association could be used to model late blight development from existing, proximal weather stations. The mean hourly RH over the trial season at all sites for potato canopies attained minima between 1500 and 1700 h in 2013 of < 46 %. From the minima the RH increased rapidly to approximately 2200 h then increased moderately until attaining maxima at 0600. Monitoring duration of RH > 90 % was more practical and efficient than monitoring leaf wetness.
      PubDate: 2016-06-01
       
  • Colorado Potato Beetle Response to Potato Plants Infected with Potato
           Virus Y and Potato Leafroll Virus
    • Abstract: Abstract Agricultural systems are often simultaneously impacted by multiple stressors. In our study, we investigated the effects of two commonly occurring viruses of potato, Potato virus Y (PVY) and Potato leafroll virus (PLRV) on host plant selection and utilization across various spatial scales by the Colorado potato beetle. Adult beetles selected PLRV-infected foliage in the cage choice trails, and larvae that fed exclusively on PLRV-infected foliage developed into larger adults. PVY-infected foliage was avoided in the cage trials and had no effect on the weight of developing adults. In field trials, preference and utilization of potato plants was more dependent on plant size than on virus infection. These results demonstrate that while virus-infected plants can cause physiological changes that influence beetle preference, beetle abundance and/or distribution is driven by a more complex array of factors at the field level. Additionally, this study demonstrates the importance of investigating the applicability of laboratory findings at the field level.
      PubDate: 2016-06-01
       
  • Canopy Indices to Quantify the Economic Optimum Nitrogen Rate in
           Processing Potato
    • Abstract: Abstract In-season N applications to processing potato crops may increase profits and improve N fertilizer use efficiency. The objective of our study was to evaluate indices to predict the differential economic optimum N rate (dEONR) using a SPAD 502 chlorophyll meter, a Crop Circle ACS-210 (CC), and a Green Seeker 506 (GS). Additionally, algorithms were developed to determine N fertilizer variable rates. The relative chlorophyll meter reading (RCM), the relative chlorophyll index (RCI), and the relative normalized differential vegetative index (RNDVI) were calculated using the mean sensor value divided by the value determined in plots with the highest N rate within each site-year. The relationship between relative indices and dEONR was evaluated by fitting quadratic and quadratic-plateau regression models. The canopy chlorophyll indices (RCM and RCI) were significantly associated with dEONR during the growing season (R2 = 0.48, 0.22 at 40 days after planting (DAP), R2 = 0.28, 0.73 at 60 DAP, R2 = 0.62, 0.82 at 80 DAP, R2 = 0.58, 0.83 at 100 DAP for RCM and RCI, respectively). The canopy biomass index (RNDVI) was significantly associated with dEONR only at tuber bulking (R2 = 0.51, 0.85 at 80 DAP and R2 = 0.48, 0.51 at 100 DAP, for GS and CC, respectively). The canopy chlorophyll indices performed better than the canopy biomass indices in measuring N stress. The optical sensor CC was better than the GS in predicting N stress because it measures the RNDVI and the RCI in a single reading.
      PubDate: 2016-06-01
       
  • Development of Molecular Markers Closely Linked to the Potato Leafroll
           Virus Resistance Gene, Rlr etb , for use in Marker-Assisted Selection
    • Abstract: Abstract Potato leafroll virus (PLRV) is a major pathogen of potato with worldwide impact on seed and commercial production of potato. In North America, the primary potato cultivars grown by industry are not resistant to PLRV and require the application of insecticides to control the aphid vector of PLRV, so as to prevent PLRV infection of the crop. The Solanum etuberosum- derived dominant gene Rlr etb confers resistance to PLRV and has been mapped to chromosome 4. The previous closest marker to Rlr etb , C2_At1g42990, was mapped 13.6 cM from the gene in a BC3 population. Cleaved amplified polymorphic sequence markers were developed in the region surrounding C2_At1g42990 and mapped along with Rlr etb in 102 BC4 progeny. Sixteen markers were identified surrounding Rlr etb , with flanking markers at 2.1 and 9.3 cM. Two markers, 1367-8a and DMB32-11, both 2.1 cM from Rlr etb , are shown to be well suited for marker assisted selection. The development of additional molecular markers more closely linked to Rlr etb will greatly facilitate its use in potato breeding and its continued introgression into cultivated potato for the development of PLRV-resistant cultivars.
      PubDate: 2016-06-01
       
  • Grading Seed Potato Lots to Remove Tubers with Powdery Scab Damage may not
           Eliminate the Pathogen Threat
    • Abstract: Abstract Grading seed tubers is a common practice to remove visually diseased tubers and meet certification standards. This study sought to quantify Spongospora subterranea inocula, the causal agent of powdery scab in eight commercial seedlots prior to and following grading. Pathogen levels generally decreased although the extent of reduction was dependant on the mean disease level within each seedlot, prior to grading. Where mean seedlot disease incidence was high (20 to 40 %) grading was not effective, reducing pathogen levels by only 2-fold (P > 0.05) on the visually disease-free seed following grading which remained a high risk for disease in progeny plants. However, where mean seedlot disease incidence was low (5 to 7 %) grading substantially reduced S. subterranea inoculum (12–23-fold, P < 0.05) on the visually disease-free seed to low risk levels. In further pot and field trials, planting visually disease-free tubers graded from contaminated lines gave variable disease levels in progeny plants, although under conducive conditions resulted in root and tuber disease no different to planting diseased seed.
      PubDate: 2016-06-01
       
  • Influence of a Native Solanum tuberosum ssp. andigenum Potato Variety on
           Management of the Guatemalan Potato Moth in the Venezuelan Andes
    • Abstract: Abstract Smallholder farmers in the Venezuelan Andes have observed that native Solanum tuberosum ssp. Andigenum (Andigena) potato varieties are less susceptible to damage from the invasive pest, Tecia solanivora P. (Lepidoptera: Gelechiidae) than improved varieties. Surprisingly, the value of using Andigena varieties in the management of T. solanivora remains unexplored. Field trials were established in Misinta, Venezuela, to assess T. solanivora damage on potatoes from an Andigena variety, ‘Imilla negra’, and two improved varieties, ‘Andinita’ and ‘Unica’. The influence of intercropped Imilla negra varieties on T. solanivora damage and marketable yield in neighboring improved potato varieties was also assessed. While Imilla negra had significantly less T. solanivora damage per plant (percentage of damaged tubers) and per tuber (number of larval exit perforations) than Andinita and Unica in monoculture trials, intercropped Imilla negra did not reduce T. solanivora damage or increase undamaged tuber yield of improved varieties in polycultures. The results support Andean farmer knowledge on Andigena potato varieties and suggest that the proper incorporation of these varieties into potato cropping systems might be a promising strategy in managing T. solanivora. Nevertheless, further evaluation extending beyond a single growing season is needed to validate the findings of this study over time, as year to year variability in environmental conditions can alter host plant preference in herbivorous insects.
      PubDate: 2016-06-01
       
  • Exposure of Potato Tuber to Varying Concentrations of
           1,4-Dimethylnaphthalene Decrease the Expression of Transcripts for Plastid
           Proteins
    • Abstract: Abstract Application of the compound 1,4-dimethylnaphthalene (DMN) has been found to reduce premature sprouting in stored potato tubers. The mechanism of action for DMN has yet to be elucidated but transcriptional changes are known to occur following exposure. In this study non-dormant potato tubers (Solanum tuberosum L., cv. Russet Burbank) were treated with varying amounts of DMN resulting in an increasing residue on the tuber surface. RNA sequencing was used to measure transcriptome changes in excised meristems from tubers having increasing DMN exposure. Treatment of tubers with DMN that resulted in surface residue levels greater than 2 ppm was associated with a decrease in 45 transcripts that encoded for proteins linked with plastid development and function and an increase in the expression of 15 transcripts that encoded for WRKY-type transcription factors. qt-PCR analysis showed that repression of plastid transcripts appeared to recover 7 days after DMN exposure but induction of WRKY transcripts was maintained up to 35 days post treatment. The data suggests DMN may inhibit plastid development short term but also results in long-term changes in some regions of the transcriptome.
      PubDate: 2016-06-01
       
  • Economic Comparison of Conventional and Conservation Management Practices
           for Irrigated Potato Production in Southern Alberta
    • Abstract: Abstract Conventional (CONV) potato (Solanum tuberosum L.) production in Alberta has relied on high levels of soil disturbance which may result in long-term degradation of soil resources. A 12-yr (2000–2011) study was conducted to address issues with the CONV system and to evaluate the effects of conservation (CONS) practices on the economics of irrigated potato production. Potato was grown in 3- to 6-yr rotations which included dry bean (Phaseolus vulgaris L.), sugar beet (Beta vulgaris L.), soft wheat (Triticum aestivum L.), oat (Avena sativa L.), and timothy (Phleum pratense L.). CONS included reduced tillage, cover crops, compost addition, and solid-seeded bean. Averaged over 12-yr, potato yields for 4-yr CONV rotations (potato–wheat–beet–bean) were lower than those for CONS systems. However, the decreased costs associated with not using compost in 4-yr CONV offset the losses in yield, thereby resulting in an overall net income higher than that of CONS systems.
      PubDate: 2016-05-13
       
  • Water Regimes and Humic Acid Application Influences Potato Growth, Yield,
           Tuber Quality and Water Use Efficiency
    • Abstract: Abstract This study assessed effects of irrigation water regimes and humic acid (HA) application on vegetative growth, yield, tuber quality and water use efficiency (WUE) of potato. Five irrigation treatments were applied at three developmental stages; (WR1) control (100 % crop evapotranspiration, 100 % ETc) at all plant growth, (WR2) 75 % ETc at all stages, (WR3) 75 % ETc at stage S1 (vegetative growth), (WR4) 75 % ETc at stage S2 (tuber initiation), and (WR5) 75 % ETc at stage S3 (tuber bulking). HA was applied at a rate of 1.5 g L−1 30 day after seed pieces planting. Plants experiencing water stress at S1 were shorter with fewer branches and lower fresh and dry vine weights. Water stress imposed at S2 significantly reduced tuber number, size, and yield. HA application increased vegetative growth, tuber weight, yield, WUE, and tuber quality (specific gravity and starch content). Thus, applying 1.5 g L−1 HA during vegetative growth and a 75 % ET water regime at S3 can increase potato production and tuber quality while reducing water use.
      PubDate: 2016-05-13
       
  • Accumulation of Genetic Diversity in the US Potato Genebank
    • Abstract: Abstract Efficient assessment of genetic diversity in a potato genebank includes understanding how much of the available genetic diversity has been captured in the genebank (from the wild or from other ex situ sources). We used existing datasets from three of the genebank’s 93 species to model the increase of diversity over time, as measured by the addition of AFLP bands. DNA samples of a total of 411 populations of S. microdontum (mcd), S. jamesii (jam), and S. fendleri (fen) were analyzed. Assuming the first (oldest) populations as the baseline, the number of AFLP markers have increased by 128 % (mcd), 154 % (jam) and 111 % (fen) with addition of populations to the genebank. The pattern of actual observed chronological gain in diversity was similar to that which one would expect from random additions of populations except for fen, suggesting recent additions were somewhat redundant. All species continued to accumulate new loci at least up to 100 populations, jam particularly so. Much effort has been made over many years to thoroughly collect jam, so its 125 populations could serve as a model for the number of samples one might practically hope to acquire for the average species. Since 100 jam populations captured 95 % of its polymorphic loci, 100 populations might be set as an optimal benchmark. The average species in the genebank now has about 54 populations, so the size of the genebank would need to roughly double its capacity to optimize diversity according to the jam model. That would be a challenge, but probably not as limiting as the great time and resources needed to collect the germplasm.
      PubDate: 2016-05-13
       
  • Erratum to: Nutritional and Structural Response of Potato Plants to
           Reduced Nitrogen Supply in Nutrient Solution
    • PubDate: 2016-04-29
       
  • Potato Production in Thailand
    • Abstract: Abstract Potato production has increased dramatically in recent years in Thailand. Consumer demand for fresh and processed potatoes has driven this trend. Most potatoes are produced in northern Thailand in either double cropping highland zones or as a single winter crop following rice in lowland regions. Major production constraints are quality seed, cultivars adapted to short season warm climates, and high disease incidence. There is a need for increased research for cultivar development, access to high quality seed and improved commercial potato production practices.
      PubDate: 2016-04-29
       
  • Intuitive Visual Impressions (Cogs) for Identifying Clusters of Diversity
           within Potato Species
    • Abstract: Abstract One of the basic research activities of genebanks is to partition stocks into groups that facilitate the efficient preservation and evaluation of the full range of useful phenotype diversity. We sought to test the usefulness of making intraspecific groups by replicated rapid visual intuitive impressions of coded plants by multiple uncoached observers. We invented the term “cog” (shorthand for cognate = “born together”) to indicate assumed genetic relatedness of cog members. All of the 16 populations of the wild potato species Solanum okadae in the genebank were thus examined in four separate grow-outs by up to seven genebank staff members, a total of 26 times. They were instructed to place them into two cogs defined only as big and not-big. Four populations were placed in the big cog for 70–90 % of observations, while all remaining populations but one were placed in the big cog for less than 5 % of observations. All populations were then assessed for DNA markers and various empirical traits. AFLP and SNP markers clearly distinguished the two cogs. The big cog populations were also distinguished from the others by virtue of having less foliar late blight resistance, more leaf hairiness, and lower tuber tomatine content. SNP similarity suggests one population of reputed Bolivian origin is really a mislabeled duplicate of another from Argentina. If so, the two cogs also perfectly align with country of natural origin, with big originating exclusively from Bolivia. Using S. okadae as a model, we demonstrated that rapid, simple, and inexpensive visual intuitive cogs reliably predict significant genetic and phenotypic differences. We propose testing the cog technique on other species and applying it as a new potato germplasm descriptor.
      PubDate: 2016-04-29
       
  • Salt Accumulation and Potato Tuber Yield Response to Historical Dairy
           Manure Applications in South-Central Idaho
    • Abstract: Abstract Dairy manure applications are common practice in southern Idaho. Questions have arisen regarding the salt accumulations commonly associated with dairy manure applications on salt-sensitive crops like potatoes. The objective of this 2-year study was to evaluate the impact of dairy manure, dairy compost, dairy lagoon water and fertilizer application on salt accumulation and tuber yields in south-central Idaho based on grower-reported nutrient applications and yields. Soil samples and grower-reported tuber yield information were collected midseason (during time period of July 1st-July 30th) from 84 cooperator potato fields in south-central Idaho in both 2009 and 2010. Soil samples were collected to a 30 cm depth and analyzed for soil electrical conductivity (EC), soluble K, Na, Ca, Mg, and pH. Information on manure application, cultural management practices, and total tuber yield was collected for each field. Average reported application rates (wet basis) of these amendments were: 128 Mg ha−1 dairy manure (28 fields), 29 Mg ha−1 dairy compost (11 fields), 415,000 l ha−1 dairy lagoon water (9 fields), or no manure applied (33 fields) over the 4 year period prior to the study. Mean soil soluble K for dairy manure (1.6 mmolc L−1) and dairy lagoon water fields (1.4 mmolc L−1) were significantly greater than dairy compost (0.6 mmolc L−1) or fertilizer fields (0.4 mmolc L−1). Manure application history had no significant treatment effect on soil electrical conductivity (EC), sodium adsorption ratio (SAR), soluble Na, Ca, or K, soil pH, or grower-reported total tuber yield. These overall findings suggest that current dairy manure, compost, and lagoon water application practices to potato production systems in south-central Idaho are not significantly influencing tuber yield or soil salt accumulations. However, significant soluble K accumulations in the soil suggest that dairy manure and dairy lagoon water applications should still be monitored to avoid potential salt accumulations and yield losses.
      PubDate: 2016-04-01
       
  • Yield and Physiological Response of Potatoes Indicate Different Strategies
           to Cope with Drought Stress and Nitrogen Fertilization
    • Abstract: Abstract Access to Water and Nitrogen (N) are key challenges in potato crop management that could be optimized through understanding related agronomic and physiological traits. The responses to water deficit and two levels of nitrogen (0 and 200 kg N.ha-1) were assessed here for agronomic and physiological traits for potato genotypes UNICA, Achirana-INTA, and CIP397077.16, chosen for their short vegetative period (90–-110 days) and tolerance to water deficit. Nitrogen Use Efficiency (NUE) was greatly reduced in all genotypes under drought, even dropping to nearly zero. Despite this, the tuber yield and total biomass reduction of around 50 % for all genotypes could be alleviated with N application. Normalized Difference Vegetation Index (NDVI), chlorophyll content (SPAD), and Canopy cover (CC) were found to be good indicators for predicting nitrogen deficits and detecting early stress by drought. Overall, each genotype had different strategies to manage N and cope with drought stress. UNICA was the most efficient genotype at using the N present in the soil and tolerating drought stress, while Achirana-INTA was most affected by drought in terms of NUE. Based on the results, it is suggested that maximum fertilizer use efficiency can be obtained with low N rates applied under well-watered conditions. Improved NUE and a greater understanding of the physiological response of crops to drought stress and N fertilization will help to reduce fertilizer use, lessening the effects of water contamination and improving input efficiency.
      PubDate: 2016-03-25
       
 
 
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