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  Subjects -> AGRICULTURE (Total: 767 journals)
    - AGRICULTURAL ECONOMICS (75 journals)
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AGRICULTURE (522 journals)                  1 2 3 | Last

Showing 1 - 200 of 263 Journals sorted alphabetically
Aceh International Journal of Science and Technology     Open Access   (Followers: 2)
Acta agriculturae Slovenica     Open Access   (Followers: 4)
Acta Agronomica Hungarica     Full-text available via subscription   (Followers: 1)
Acta Scientiarum. Animal Sciences     Open Access   (Followers: 2)
Acta Scientiarum. Technology     Open Access   (Followers: 2)
Acta Technologica Agriculturae     Open Access   (Followers: 1)
Acta Universitatis Sapientiae, Alimentaria     Open Access   (Followers: 1)
Advances in Agriculture     Open Access   (Followers: 6)
Advances in Agriculture & Botanics     Open Access   (Followers: 12)
Advances in Agronomy     Full-text available via subscription   (Followers: 14)
Advances in Life Science and Technology     Open Access   (Followers: 14)
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: 4)
African Journal of Food, Agriculture, Nutrition and Development     Open Access   (Followers: 15)
African Journal of Range & Forage Science     Hybrid Journal   (Followers: 6)
Agra Europe     Full-text available via subscription   (Followers: 3)
Agribusiness : an International Journal     Hybrid Journal   (Followers: 6)
Agricultura Tecnica     Open Access   (Followers: 6)
Agricultura Tropica et Subtropica     Open Access   (Followers: 1)
Agricultura, Sociedad y Desarrollo     Open Access   (Followers: 1)
Agricultural and Food Science     Open Access   (Followers: 18)
Agricultural Commodities     Full-text available via subscription  
Agricultural Economics     Hybrid Journal   (Followers: 44)
Agricultural History Review     Full-text available via subscription   (Followers: 6)
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: 28)
Agricultural Water Management     Hybrid Journal   (Followers: 33)
Agriculture     Open Access   (Followers: 6)
Agriculture & Food Security     Open Access   (Followers: 10)
Agriculture (Poľnohospodárstvo)     Open Access   (Followers: 1)
Agriculture and Agricultural Science Procedia     Open Access  
Agriculture and Food Sciences Research     Open Access   (Followers: 2)
Agriculture and Human Values     Hybrid Journal   (Followers: 12)
Agriculture, Ecosystems & Environment     Hybrid Journal   (Followers: 48)
Agriprobe     Open Access  
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: 11)
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: 15)
American Journal of Economics and Sociology     Hybrid Journal   (Followers: 27)
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: 2)
Annals of Silvicultural Research     Open Access   (Followers: 1)
Annual Review of Resource Economics     Full-text available via subscription   (Followers: 12)
APCBEE Procedia     Partially Free   (Followers: 1)
Applied Economics Letters     Hybrid Journal   (Followers: 26)
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)
ARO. The Scientific Journal of Koya University     Open Access  
Arquivos do Instituto Biológico     Open Access   (Followers: 1)
Arthropod-Plant Interactions     Hybrid Journal   (Followers: 2)
Asian Economic Papers     Hybrid Journal   (Followers: 5)
Asian Journal of Agricultural Research     Open Access   (Followers: 4)
Asian Journal of Medical and Biological Research     Open Access   (Followers: 1)
Asian Journal of Plant Sciences     Open Access   (Followers: 2)
Australian Cottongrower, The     Full-text available via subscription   (Followers: 1)
Australian Economic Papers     Hybrid Journal   (Followers: 14)
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: 2)
Bangladesh Journal of Scientific Research     Open Access   (Followers: 1)
Bioagro     Open Access   (Followers: 1)
Biocatalysis and Agricultural Biotechnology     Hybrid Journal   (Followers: 4)
Biocontrol Science and Technology     Hybrid Journal   (Followers: 6)
Biodiversity     Hybrid Journal   (Followers: 26)
Biodiversity : Research and Conservation     Open Access   (Followers: 26)
Biological Agriculture & Horticulture : An International Journal for Sustainable Production Systems     Partially Free   (Followers: 11)
Biosystems Engineering     Hybrid Journal   (Followers: 7)
Biotemas     Open Access  
Boletín Semillas Ambientales     Open Access  
Bragantia     Open Access   (Followers: 2)
Brazilian Archives of Biology and Technology     Open Access   (Followers: 3)
British Poultry Science     Hybrid Journal   (Followers: 5)
Buletin Peternakan : Bulletin of Animal Science     Full-text available via subscription  
Buletin Veteriner Udayana     Open Access   (Followers: 2)
Bulletin of University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca : Food Science and Technology     Open Access  
Cahiers Agricultures     Open Access  
California Agriculture     Open Access   (Followers: 1)
Cambridge Journal of Economics     Hybrid Journal   (Followers: 45)
Canadian Water Resources Journal     Hybrid Journal   (Followers: 20)
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: 2)
Ciencia y Agricultura     Open Access  
Ciencia, Tecnología y Salud     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   (Followers: 1)
Competition & Change     Hybrid Journal   (Followers: 8)
Computers and Electronics in Agriculture     Hybrid Journal   (Followers: 4)
Contributions to Tobacco Research     Open Access   (Followers: 2)
Corps et culture     Open Access   (Followers: 6)
Cuadernos de Desarrollo Rural     Open Access   (Followers: 1)
Cultivos Tropicales     Open Access  
Cultural Geographies     Hybrid Journal   (Followers: 16)
Cultural Sociology     Hybrid Journal   (Followers: 29)
Cultural Studies - Critical Methodologies     Hybrid Journal   (Followers: 15)
Cultural Studies of Science Education     Hybrid Journal   (Followers: 6)
Cultural Trends     Hybrid Journal   (Followers: 13)
Culture & Agriculture     Hybrid Journal   (Followers: 12)
Culture, Agriculture, Food and Environment     Hybrid Journal   (Followers: 6)
Current Life Sciences     Open Access   (Followers: 3)
Current Research in Dairy Sciences     Open Access   (Followers: 5)
Derim     Open Access  
Developments in Agricultural Economics     Full-text available via subscription   (Followers: 4)
Developments in Agricultural Engineering     Full-text available via subscription   (Followers: 1)
Diatom Research     Hybrid Journal   (Followers: 1)
Die Bodenkultur : Journal of Land Management, Food and Environment     Open Access  
Dossiers Agraris     Open Access  
Ecological Applications     Full-text available via subscription   (Followers: 128)
Economic Affairs     Hybrid Journal   (Followers: 7)
Economic and Industrial Democracy     Hybrid Journal   (Followers: 9)
Economic Bulletin     Hybrid Journal   (Followers: 4)
Economic Policy     Hybrid Journal   (Followers: 34)
Economic Record     Hybrid Journal   (Followers: 6)
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  
Eppo Bulletin     Hybrid Journal   (Followers: 2)
Ethiopian Journal of Agricultural Sciences     Open Access  
Ethiopian Journal of Science and Technology     Open Access  
Ethology     Hybrid Journal   (Followers: 6)
EU agrarian Law     Open Access   (Followers: 4)
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: 18)
European Journal of Law and Economics     Hybrid Journal   (Followers: 63)
European Review of Agricultural Economics     Hybrid Journal   (Followers: 12)
EvoDevo     Open Access   (Followers: 3)
Extensão Rural     Open Access   (Followers: 1)
Farmer’s Weekly     Full-text available via subscription  
Farmlink Africa     Full-text available via subscription  
Fitosanidad     Open Access  
Folia Horticulturae     Open Access   (Followers: 2)
Food and Agricultural Immunology     Hybrid Journal   (Followers: 2)
Food and Energy Security     Open Access   (Followers: 4)
Food Biotechnology     Hybrid Journal   (Followers: 12)
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: 30)
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: 3)
Geoderma     Hybrid Journal   (Followers: 9)
Global Approaches to Extension Practice : A Journal of Agricultural Extension     Full-text available via subscription   (Followers: 1)
Global Economic Review     Hybrid Journal   (Followers: 6)
Global Journal of Agricultural Sciences     Full-text available via subscription  
Gontor Agrotech Science Journal     Open Access  
Hacquetia     Open Access  

        1 2 3 | Last

Journal Cover American Journal of Potato Research
  [SJR: 0.558]   [H-I: 35]   [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  [2336 journals]
  • Interactive Effects of Fumigation and Fungicides on Potato Response to
           Nitrogen Rate or Timing
    • Authors: Keith A. Kelling; Walter R. Stevenson; Phillip E. Speth; R. Vaughan James
      Pages: 533 - 542
      Abstract: The availability and use of crop protectants including azoxystrobin in combination with fumigation has extended the Central Wisconsin effective growing season by 2 to 4 weeks. This study, evaluating the influence of these crop protection practices on the optimum nitrogen rate and time of application for Russet Burbank potato (Solanum tuberosum L.), was established as two 3-year field trials designed as split-split plot experiments. Both experiments used metam sodium as the main plots and fungicide treatment (chlorothalonil Zn alone or chlorothalonil Zn alternated with azoxystrobin for the first six sprays) as the first split. In-season fertilizer N rate (179, 224, 269, or 313 kg N ha−1) or in-season N timing (N split into two, three, or four applications at 269 kg N ha−1) was the second split. Not fumigating resulted in significantly higher verticillium ratings and severely repressed crop yield and tuber quality responses to both fungicide treatment and N rate. On average, fumigation increased total yield 13.6 Mg ha−1yr−1, U.S. No. 1 tubers by 9 % and U.S. No. 1 tubers >170 g by 5 % over where fumigation was not used. In 2 of the 3 years when azoxystrobin was included in the fungicide program early blight severity was reduced by about 50 %, and on fumigated areas yields were increased 4.8 Mg ha−1, whereas no yield increase was seen from this fungicide treatment on the non-fumigated plots. In these same years, fumigation increased optimum N rate by about 50 kg ha−1; however, there was no apparent interaction with fungicide treatment. Although fumigation, fungicide treatment, and time of N application each influenced tuber yield or tuber quality in some years, in the two more responsive years some interactions between these factors were statistically significant, with benefits generally only seen where plots were fumigated.
      PubDate: 2016-12-01
      DOI: 10.1007/s12230-016-9532-6
      Issue No: Vol. 93, No. 6 (2016)
  • Characterization and Evaluation of Potato Genotypes ( Solanum tuberosum L
           ) for Tolerance to Drought in Uganda
    • Authors: V. E. Kesiime; G. Tusiime; I. N. Kashaija; R. Edema; P. Gibson; P. Namugga; R. Kakuhenzire
      Pages: 543 - 551
      Abstract: Potato production in Uganda is being affected by rainfall fluctuations in both timing and amount, resulting into inadequate soil moisture availability and low productivity. Also, potato production is expanding into locations at lower altitudes, where drought is more common. Therefore, drought stress mitigation measures and coping mechanisms need to be devised to face future challenges of climate change, particularly in developing countries to ensure steady supply of adequate quantities of quality food. This study thus, aimed at characterizing new potato clones from CIP (International Potato Center) for tolerance to drought under Ugandan conditions. Consequently a screen house experiment was conducted twice at Kachwekano Zonal Agricultural Research and Development Institute (KAZARDI) from October 2011 to February 2012 and April to July 2012 to evaluate and characterize eight potato genotypes; five of which were obtained from CIP’s breeding collection for drought tolerance and low altitude areas, and three locally released varieties from Uganda. These clones were tested for drought tolerance at three levels of simulated moisture deficit; 25 % field capacity, 50 % and 100 % field capacity (FC). Data were collected on leaf chlorophyll content, relative leaf water content, number of days to 50 % flowering, percent ground cover, leaf area, plant height, number of stems per plant, stem diameter, stress score, increment in plant height after imposing stress, tuber dry matter content and yield components. Of all the traits evaluated, yield and number of days to 50 % flowering contributed most to drought tolerance among the potato genotypes evaluated. There were significant (P ≤ 0.05) differences among genotypes for all evaluated traits. Results from both growth, physiological and yield parameters revealed that the new potato clones were less affected by drought stress compared to adapted varieties. Total tuber yield was 23 tons per hectare, 11.4 and 8.1 in plots at full field capacity, 50 % and 25 % moisture stressed plots respectively in the first experiment. A similar trend was obtained in the second experiment with 19 tons per hectare, 13.7 and 11.3 respectively. The new clones at highest moisture stress had significantly (P ≤ 0.05) higher yields than adapted varieties providing a promise for possible new varieties and breeding stock in extreme conditions of moisture deficit.
      PubDate: 2016-12-01
      DOI: 10.1007/s12230-016-9533-5
      Issue No: Vol. 93, No. 6 (2016)
  • Crop Management Practices and Reduction of On-Farm Spread of Potato virus
           Y : a 5-Year Study in Commercial Potato Fields in New Brunswick, Canada
    • Authors: Tyler D. B. MacKenzie; Xianzhou Nie; Mathuresh Singh
      Pages: 552 - 563
      Abstract: In this study, on-farm within-season spread of Potato virus Y (PVY) was measured in 56 seed, processing and tablestock potato fields in New Brunswick, Canada between 2010 and 2014. These represented 13 potato varieties, managed by 16 growers employing a wide range of PVY control techniques. Many aspects of management techniques were quantified, as well local aphid abundances and climatological data. PVY spread, measured in leaves and tubers (by ELISA and RT-PCR), was tracked through the season in individually marked plants. Over the five seasons under study, on-farm PVY spread overall has declined substantially. Across all 56 fields, however, it has varied widely, from 10 fields not showing any spread during the crop season, up to as high as 76 % spread in one 2012 field. Factors correlated with increased PVY spread included seed-borne PVY inoculum planted in the field, aphid abundance early in the season, and to a lesser degree temperatures in July and over the preceding winter. Factors correlated with decreased spread included numbers of foliar mineral oil and insecticide sprays (especially of the lambda-cyhalothrin and flonicamid types), later crop planting and earlier first spraying dates. A mid-season leaf test for PVY was shown to be strongly indicative of ultimate PVY spread at harvest, and may prove a useful test in advising growers. A set of locally-relevant best management practices based on these results is discussed.
      PubDate: 2016-12-01
      DOI: 10.1007/s12230-016-9534-4
      Issue No: Vol. 93, No. 6 (2016)
  • Tuber Chemical Composition and Acrylamide Formation Potential in three
           Potato Cultivars Supplied with two Nitrogen Sources
    • Authors: J. G. Silva; A. P. Araújo; S. M. Vieira; M. G. C. França
      Pages: 572 - 580
      Abstract: Some traits of potato tubers can affect their quality, contributing to potential acrylamide formation in chips. Using three potato cultivars with contrasting dry biomass and reducing sugar contents, the effects of nitrogen source and storage conditions on tuber non-structural carbohydrate and free amino acid contents were evaluated. Color and acrylamide precursors formation were also evaluated. Cultivars presented their own characteristics for accumulation of sugars and free amino acids, the nitrogen source having only a minor effect on carbohydrates and amino acids contents. Starch mobilization and free amino acid accumulation occurred in all cultivars, but one presented the greatest sugars contents after cold storage. In general, tubers having the greatest sugar and amino acids contents also presented color alteration in chips and greatest acrylamide content. Selecting potato cultivars with lower sugars content and sensitivity to cold storage could be strategies to reduce contents of acrylamide precursors in tubers that decrease chips quality.
      PubDate: 2016-12-01
      DOI: 10.1007/s12230-016-9537-1
      Issue No: Vol. 93, No. 6 (2016)
  • Manipulation of Physiological Seed Age of Russet Burbank and Ranger Russet
           Potatoes – Economic Evaluation
    • Authors: Sarad Nepal; Christopher S. McIntosh; Michael K. Thornton; Nora Olsen; Phil Nolte; Paul E. Patterson
      Pages: 590 - 601
      Abstract: Physiological age of seed potatoes can impact stem number per plant and harvestable tuber number and size. Alteration in harvested tuber size has economic implications based upon market and pricing. The objective of this study was to manipulate physiological age of seed potatoes utilizing seven storage temperature regimes for two cultivars (Ranger Russet and Russet Burbank) over three different growing seasons in Idaho and to assess changes in stem number and harvested tuber size profile. Aged seed were planted in three locations in Idaho and evaluated for stem number per plant and yield. As seed storage temperature increased, seed physiologically aged, as evidenced by a rise in the number of stems per plant. This result was similar in all three locations and for both cultivars. The number of stems per plant can be used as an early season predictor of potato yield and size. Stem number per plant, the number of tubers and average tuber size were compared for each treatment and location. Economic returns were analyzed using ordinary least squares regressions. Economic impacts of physiological seed aging in terms of dollars per hectare for fresh and processed markets were mixed.
      PubDate: 2016-12-01
      DOI: 10.1007/s12230-016-9539-z
      Issue No: Vol. 93, No. 6 (2016)
  • Detection and Differentiation of Potato Virus Y Strains by Melting
           Analysis of an Oligonucleotide Virus Probe
    • Authors: N. Rotem; C. Shtein; A. Rosner; D. Levy; H. D. Rabinowitch
      Pages: 620 - 625
      Abstract: A novel simple, fast qualitative method for detection and differentiation of PVY strains in potatoes by the LightCycler technology is described. Fluorescent-labeled probe designed to contain variable degree of homology with a ‘target sequence’ of several known reference PVY strains was annealed to PCR products of these viruses followed by a graded melting analysis. The specific characteristics of the melting curves enable the detection, distinction and differentiation of each of following four known PVY strains O-FL, O-RB, N and NTN, in a single reaction obviating the need for size or nucleotide sequence analyses. In addition, it was demonstrated that virus extracts from plants infected with more than one strain can be resolved using this procedure. The melting-curves of extracts from 55 market size tubers harvested randomly from commercial fields and compared with those of the reference virus strains, revealed the presence of O-FL, O-RB and NTN strains of PVY.
      PubDate: 2016-12-01
      DOI: 10.1007/s12230-016-9531-7
      Issue No: Vol. 93, No. 6 (2016)
  • Accumulation of Genetic Diversity in the US Potato Genebank
    • Authors: John Bamberg; Alfonso del Rio
      Pages: 430 - 435
      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: 2016-10-01
      DOI: 10.1007/s12230-016-9519-3
      Issue No: Vol. 93, No. 5 (2016)
  • Water Regimes and Humic Acid Application Influences Potato Growth, Yield,
           Tuber Quality and Water Use Efficiency
    • Authors: Mekhled Alenazi; Mahmoud Abady Wahb-Allah; Hesham Saleh Abdel-Razzak; Abdullah Anwar Ibrahim; Abdullah Alsadon
      Pages: 463 - 473
      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: 2016-10-01
      DOI: 10.1007/s12230-016-9523-7
      Issue No: Vol. 93, No. 5 (2016)
  • Field Evaluation of Potato Genotypes for Resistance to Powdery Scab on
           Tubers and Root Gall Formation Caused by Spongospora subterranea
    • Authors: Francisco G. Bittara; Asunta L. Thompson; Neil C. Gudmestad; Gary A. Secor
      Pages: 497 - 508
      Abstract: Spongospora subterranea causes root galls and powdery scab on potato tubers (Solanum tuberosum L.). Host resistance represents an economically suitable and long term approach for the management of the disease; however, the relationship between root and tuber symptoms may vary across potato genotypes. To assess susceptibility differences among genotypes, 30 potato cultivars and 83 advanced clones with varying skin type (market class) were evaluated for powdery scab and root gall formation. Five field experiments were conducted during 2011 and 2012 on naturally infested soils in Minnesota and North Dakota. Differences among genotypes in the degree of susceptibility to tuber and root symptoms were observed (P < 0.001, n = 33 to 80). Higher powdery scab pressure (P < 0.001, n = 90) was observed in North Dakota locations across years. Environmental conditions influenced the formation of root galls and the expression of powdery scab, with greatest variability among white- and red-skinned genotypes. Under high disease pressure, the estimates of broad-sense heritability for powdery scab incidence and severity were 0.76 and 0.63, respectively. Across environments, russet-skinned genotypes resulted in less disease on tubers, but yielded similar levels of root galls as red-skinned genotypes. Tuber scab and root gall formation indices were significantly associated (r = 0.42, P < 0.001, n = 80); however, high levels of disease in roots were observed in genotypes ranked resistant to powdery scab. Cultivars Dakota Trailblazer, Dakota Russet and Karu ranked highly resistant, whereas Shepody, Kennebec and Red LaSoda were highly susceptible to both phases of the disease. Cultivar selection is highly recommended for disease management.
      PubDate: 2016-10-01
      DOI: 10.1007/s12230-016-9526-4
      Issue No: Vol. 93, No. 5 (2016)
  • Genetic Fingerprinting of Potato Varieties from the Northwest Potato
           Variety Development Program
    • Authors: Sapinder Bali; Vidyasagar Sathuvalli; Chuck Brown; Rich Novy; Lorie Ewing; Jeanne Debons; David Douches; Joseph Coombs; Duroy Navarre; Jonathan Whitworth; Brian Charlton; Solomon Yilma; Clinton Shock; Jeff Stark; Mark Pavek; N. Richard Knowles
      Abstract: The Northwest Potato Variety Development (NWPVD) Program has released 45 improved potato varieties since 1985. Thirty-four potato varieties, four breeding clones and two advanced selections from NWPVD Program, and six commonly-grown potato varieties were fingerprinted using 32 simple sequence repeat (SSR) markers and 12,808 single nucleotide polymorphism (SNP) markers. Of 32 SSR markers, 29 exhibited significant polymorphism across all the 46 potato clones studied. A total of 143 alleles were observed with an average of 4.6 alleles per SSR marker. These markers span all 12 chromosomes of potato, with a maximum of five markers from chromosome VIII and minimum of one marker from chromosome VI. The polymorphic information content (PIC) and expected heterozygosity (He) of the SSR markers ranges between 0.18 to 0.75 and 0.20 to 0.78, respectively. Based on PIC, He, and ease of scoring, we recommend a set of eight SSR markers: STG0016, STI0004, STI0012, STI0023, STI0030, STI0033, STM1016 and STM1104 for fingerprinting NWPVD varieties. Out of 12,808 SNPs, 88.8% resulted in reliable three cluster diploid calling of which 87.8% were polymorphic. Tetraploid calling resulted in 44.2% of SNPs of which 94.5% were polymorphic. Our study provided fingerprinting resources for the NWPVD varieties and can be used in issues related to intellectual property rights, ownership, trademark and diversity analysis.
      PubDate: 2016-11-14
      DOI: 10.1007/s12230-016-9547-z
  • Morphological Characteristics of Solanum Tuberosum Varieties Cultivated in
           North-West Spain
    • Authors: Ana Seijo-Rodríguez; Olga Escuredo; M. Shantal Rodríguez-Flores; M. Carmen Seijo-Coello
      Abstract: Potato is one of the main agricultural crops in north-western Spain. Varieties such as Baraka, Kennebec, Desiree and Alava are more commonly planted, but there is an interest in introducing other improved cultivars. The first step in the identification of a new potato varieties includes an assessment of the morphological characteristics of its aerial parts and their tubers characteristics. In this work, 36 botanical descriptors of 28 potato varieties were studied. The study took place during 2014 and 2015 in an experimental field at the Agricultural Research Centre of INORDE in A Limia (Ourense), Spain. Each variety was planted in three plots distributed within the experimental field. Morphological characteristics were measured on six plants of each variety. Multivariate statistical analyses were performed to identify differences and similarities between varieties. The floral characteristics and the degree of flowering were important features to differentiate the varieties. Also, plant habit, pigmentation in stem, calix and pedicel contributed to this differentiation.
      PubDate: 2016-11-07
      DOI: 10.1007/s12230-016-9544-2
  • Potato Tuber Length-Width Ratio Assessment Using Image Analysis
    • Authors: Yongsheng Si; Sindhuja Sankaran; N. Richard Knowles; Mark J. Pavek
      Abstract: Potato tuber length to width (L/W) ratio is a critical crop trait evaluated during the development and selection of new cultivars to assess the effects of environment and management on tuber size and shape. The major challenges in manual measurement of L/W ratio are that it is labor-intensive, time consuming, and sometimes inconsistent. A high-throughput, digital image-based method for estimation of L/W ratio was developed in this study. Tests were conducted using tubers from a local retail market (red, white and russet) and from a field experiment with Payette Russet cultivar specifically designed to alter tuber size and shape. An image processing algorithm was developed to process the potato tuber images and the L/W ratio data from the images were compared to manual caliper measurements. A high accuracy in tuber L/W ratio estimation was consistently observed using image-based analysis. Among the different potato cultivars, red cultivars had a lower average accuracy in L/W ratio estimation of 94%, while other cultivars exhibited 96% and higher average accuracies.
      PubDate: 2016-11-04
      DOI: 10.1007/s12230-016-9545-1
  • Characterization, Pathogenicity and Chemical Control of Streptomyces
           acidiscabies Associated to Potato Common Scab
    • Authors: María Elena Santos-Cervantes; Ruben Felix-Gastelum; Gabriel Herrera-Rodríguez; Mariela Guadalupe Espinoza-Mancillas; Arlene Guadalupe Mora-Romero; Norma Elena Leyva-López
      Abstract: The pathogenicity of 10 bacterial isolates was investigated on potato, radish, carrot and beet, including sensitivity and pathogen control efficacy. The isolates were identified by morphological, biochemical and molecular methods. All isolates were pathogenic on radish, carrot, and beet, and were highly virulent on potato. Although the isolates were obtained from different locations in the El Fuerte Valley (Sinaloa, Mexico), they were similar in their morphological, physiological and biochemical characteristics. Sequences of the 16S rRNA gene obtained by PCR were identical for all isolates. These results indicate that the bacterial isolates from potato scabby tissue belong to S. acidiscabies. Furthermore, the effectiveness of fluazinam, both in vitro and under greenhouse and field conditions, represents a possible option for chemical control of potato common scab disease. While our results suggest that spraying at seeding is effective in controlling common scab, future studies to combine this treatment with seed dressing before planting will be conducted to determine if there is an increase in disease control.
      PubDate: 2016-11-04
      DOI: 10.1007/s12230-016-9541-5
  • How Long can Rogued Potato Plants Left in the Field Be a Source of Potato
           Virus Y for Aphids?
    • Authors: Sébastien Boquel; Jianhua Zhang; Xianzhou Nie
      Abstract: Removal of diseased plants (roguing) is commonly practiced in seed potato production. Diseased plants left to desiccate in fields could possibly serve as sources of Potato virus Y (PVY). PVY acquisition by three aphid species (Myzus persicae, Rhopalosiphum padi, Aphis fabae) was evaluated with leaflets from rogued plants for seven days. Results showed greater PVY acquisition rates in non-colonizing aphids species compared to colonizing ones. The proportion of aphids leaving leaflets increased with time (i.e. days after plants were uprooted) and some aphids were carrying PVY in their stylets on each of the seven days of the experiment, suggesting that aphids were able to probe and acquire PVY even when plants wilted. These results confirmed that diseased plants left in fields can serve as a source of PVY for aphids even after they wilted and emphasises that proper actions must be taken to efficiently remove diseased plants from fields.
      PubDate: 2016-10-31
      DOI: 10.1007/s12230-016-9542-4
  • Genetic Diversity and Relationship of Ethiopian Potato Varieties to
           Germplasm from North America, Europe and the International Potato Center
    • Authors: Semagn Asredie Kolech; Donald Halseth; Keith Perry; David Wolfe; David S. Douches; Joseph Coombs; Walter De Jong
      Abstract: Potato is an increasingly important crop in Ethiopia, but the origin of local cultivars grown throughout the country is unknown. To evaluate the genetic diversity of Ethiopian potato cultivars, and to assess their relationship with germplasm from North America, Europe and the International Potato Center (CIP), 8303 SNP markers were used to characterize 44 local Ethiopian cultivars, as well as 26 CIP, 22 American and 17 European potato cultivars and advanced breeding clones. The marker data revealed that most of the local cultivars were duplicates; among the 44 cultivars tested, only 15 unique genotypes were observed. Principal component and neighbor-joining dendrogram analyses showed that American, European and CIP germplasm form three distinct clusters, with older Ethiopian cultivars overlapping the European cultivars, suggesting that the oldest local cultivars are of European descent. Local cultivars overall separated into two distinct clusters, suggesting that at least two distinct introductions gave rise to current local cultivars in Ethiopia. Ethiopian germplasm harbors comparable levels of genetic diversity to American, European, and CIP germplasm and could provide the foundation for a national potato breeding program.
      PubDate: 2016-10-20
      DOI: 10.1007/s12230-016-9543-3
  • Yukon Nugget: a Mid-Season Yellow Skin, Yellow Flesh Specialty Potato with
           Extreme Resistance to Potato Virus X
    • Authors: V. Sathuvalli; C. R. Brown; S. Yilma; B. A. Charlton; C. C. Shock; R. Quick; E. Feibert; J. L. Whitworth; R. G. Novy; J. C. Stark; M. J. Pavek; N. R. Knowles; R. A. Navarre; J. Debons; M. I. Vales
      Abstract: Yukon Nugget is a mid-season specialty potato with yellow flesh, yellow skin and distinct red eyes. Yukon Nugget was developed to provide the potato industry with an alternative to Yukon Gold. The overall tuber size profile of Yukon Nugget is smaller and more uniform than Yukon Gold and it typically produces an average of four more tubers per plant than Yukon Gold. Yukon Nugget tubers are ideal for boiling, baking, and microwaving, and have culinary and nutritional qualities generally similar to Yukon Gold. Yukon Nugget has extreme resistance to Potato Virus X due to presence of PVX resistance allele Rx1. It also has moderate resistance to powdery scab and tuber late blight. Yukon Nugget has less vascular and stem end discoloration and less hollow heart than Yukon Gold. Yukon Nugget is similar to Yukon Gold in terms of susceptibility to several major potato diseases, such as PVY, PLRV, and foliage late blight. It was released in 2013 by the Agricultural Experiment Stations of Oregon, Idaho and Washington and the USDA-ARS, and is a product of the Pacific Northwest (Tri-State) Potato Variety Development Program.
      PubDate: 2016-10-19
      DOI: 10.1007/s12230-016-9540-6
  • Core Collections of Potato ( Solanum ) Species Native to the USA
    • Authors: John Bamberg; Alfonso del Rio; David Kinder; Lisbeth Louderback; Bruce Pavlik; Charles Fernandez
      Abstract: Potato has two wild relatives native to the USA, Solanum jamesii (jam) and S. fendleri (fen). Core collections are a useful tool for genebanks, identifying a ranked minimum number of samples that together encompass most of the total genetic diversity. With diversity measured as presence of AFLP bands, we made core collections for each species such that >90 % of diversity was captured in a minimum of populations. For fen, bulks containing about 25 % of populations accomplished that standard. For jam, a single “mega-population” at Mesa Verde, CO, consisting of many thousands of plants, was found to encompass 82 % of the AFLP bands detected in all samples across the entire USA range, and adding three more populations captured a total of >90 %. Core members for both jam and fen with the most diversity originated from the northern part of the range. That suggests that these areas merit more collecting. If resources for germplasm preservation and evaluation are limited, samples in the core collections should take priority.
      PubDate: 2016-10-17
      DOI: 10.1007/s12230-016-9536-2
  • Relationship between Sugars and Phenylpropanoids in Tubers from Diverse
    • Authors: Rajesh K Singh; Duroy A Navarre; Charles R. Brown
      Abstract: Previous studies suggested sucrose may play a regulatory role in potato phenylpropanoid metabolism via activation of MYB transcription factors, but the interaction between sucrose and phenylpropanoids has not been studied in field grown potatoes. Exogenous sucrose increased phenylpropanoids in plantlets, whereas wounding of tuber samples increased sucrose and phenylpropanoids. Tuber sugars and phenylpropanoids were measured in over 100 different potato samples representing different genotypes, developmental stages and locations. Total phenolic content ranged from 1.6 to 17.0 mg/g dry wt and sucrose concentrations ranged from 4.7 to 132 mg/g dry wt. Sucrose was the most abundant sugar, followed by glucose and fructose. Overall, a modest positive correlation was seen between sucrose and phenolic concentrations (R2 = 0.55; p < 0.01). Typically, tubers with a higher concentration of sucrose contained higher phenolic levels. When the same cultivars were grown in multiple locations, the tubers with the lowest amount of phenolics also had the lowest amount of sucrose. The higher amounts of phenolics found in immature potatoes relative to mature potatoes also correlated with higher amounts of sucrose. Tubers infected with Zebra chip disease had higher amounts of phenylpropanoids, and also higher amounts of sucrose. These data support a regulatory role for sucrose in tuber phenylpropanoid metabolism and suggest that the absolute amount of tuber sucrose is important, but also changes in tuber sucrose homeostasis.
      PubDate: 2016-09-20
      DOI: 10.1007/s12230-016-9538-0
  • A Geostatistical Approach to Visualize the Diversity of Soil Inhabiting
           Bacteria and Edaphic Qualities in Potato ( Solanum tuberosum) Production
    • Authors: N. Rosenzweig; L. Steere; B. Gerondale; W. W. Kirk
      Abstract: A study was conducted in Michigan (MI) to assess spatial patterns of soil biological and physiochemical factors related to yield in potato production. The project developed an approach to integrate techniques including: high-throughput DNA sequencing; GIS; geostatistics; traditional soil analyses; and yield data. Twenty soil samples were taken and GPS marked in the fall of 2012 from a grower’s field scheduled to be in potato production, and total genomic DNA was extracted. Parallel sequencing targeting the 16S rRNA gene was used to assess bacterial diversity. The total number of taxa identified by sequence analysis was 21, 81, 140, 300 and 814 at the level of phyla, class, order, family and genus respectively. Sequencing results and information gathered on yield at each point was used to generate multi-layer GIS-based maps.
      PubDate: 2016-08-08
      DOI: 10.1007/s12230-016-9530-8
  • The Analysis of Potato Farming Systems in Chencha, Ethiopia: Input, Output
           and Constraints
    • Authors: Waga Mazengia Dersseh; Yenenesh Tadesse Gebresilase; Rogier P. O. Schulte; Paul C. Struik
      Abstract: A household survey was conducted for mixed farming systems in Chencha, Ethiopia. Goals of the survey were to establish a baseline for the current production system, to quantify the variation in input and output, and to identify constraints hindering expansion of potato production. Descriptive statistics and principal component analysis were computed using SPSS and XLSTAT. Input and product use constraints varied over household characteristics. Using improved varieties, inorganic fertilizers, and selling products strongly and positively correlated with the households’ wealth, adoption, and education levels. Problems of cash and inadequate produce negatively correlated with wealth, adoption factors, and education levels. Access to improved varieties, training, and fertilizer were positively correlated with age, family size and gender. Land and labour shortages and pests were identified as cross-cutting constraints. Results of the analysis identify a need for a pluriform advisory model recognizing and building upon alleviation of the diversity of constraints identified in this analysis.
      PubDate: 2016-07-20
      DOI: 10.1007/s12230-016-9521-9
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