A Framework for Drought Tolerance Research in No-till Winter Wheat in Saskatchewan PDF Download
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Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Insufficient water is the environmental factor most limiting crop productivity in the semi-arid and dry subhumid regions of Saskatchewan. This study was undertaken to establish a framework for the development of winter wheat cultivars which are less sensitive to drought stress. Five winter wheat genotypes, 'Norstar' and 'Norwin' (products of previous breeding efforts) and three more recently selected 'CDC Kestrel-type' advanced Lines were grown in 17 field environments between 1989 and 1991. This study established that the CDC Kestrel-type lines have a higher yield potential and higher average yield than Norstar or Norwin, but they do not differ in yield under most dryland conditions. The yield advantage of the CDC Kestrel type Lines was associated with conditions that favoured the establishment of yield potential. Conversely, the elimination of the CDC Kestrel-type yield advantage was associated with conditions which suppressed the establishment of yield potential. Differences in rainfall, evaporative demand, soil water depletion, evapotranspiration and aerial biomass accumulation during four periods of crop development resulted in three temporal patterns of drought stress: (1) intermittent, (2) terminal and (3) low stress. The environmental effect on grain yield was due to crop water conditions during all development periods. Crop water conditions from heading to anthesis were particularly important to grain yield. Flag leaf water content was positively related to grain yield in the dryland trials. There was no association between aerial biomass at anthesis and grain yield. Both pre- and post-anthesis ET were of similar importance to grain yield. Soil water reserves were depleted by the time the crop had headed in the dryland trials. Consequently, flag leaf water content declined. The distribution of growing season rainfall determined the timing and intensity of drought. A relatively small genotype-environment (GE) interaction for grain yield resulted in a poor co.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Insufficient water is the environmental factor most limiting crop productivity in the semi-arid and dry subhumid regions of Saskatchewan. This study was undertaken to establish a framework for the development of winter wheat cultivars which are less sensitive to drought stress. Five winter wheat genotypes, 'Norstar' and 'Norwin' (products of previous breeding efforts) and three more recently selected 'CDC Kestrel-type' advanced Lines were grown in 17 field environments between 1989 and 1991. This study established that the CDC Kestrel-type lines have a higher yield potential and higher average yield than Norstar or Norwin, but they do not differ in yield under most dryland conditions. The yield advantage of the CDC Kestrel type Lines was associated with conditions that favoured the establishment of yield potential. Conversely, the elimination of the CDC Kestrel-type yield advantage was associated with conditions which suppressed the establishment of yield potential. Differences in rainfall, evaporative demand, soil water depletion, evapotranspiration and aerial biomass accumulation during four periods of crop development resulted in three temporal patterns of drought stress: (1) intermittent, (2) terminal and (3) low stress. The environmental effect on grain yield was due to crop water conditions during all development periods. Crop water conditions from heading to anthesis were particularly important to grain yield. Flag leaf water content was positively related to grain yield in the dryland trials. There was no association between aerial biomass at anthesis and grain yield. Both pre- and post-anthesis ET were of similar importance to grain yield. Soil water reserves were depleted by the time the crop had headed in the dryland trials. Consequently, flag leaf water content declined. The distribution of growing season rainfall determined the timing and intensity of drought. A relatively small genotype-environment (GE) interaction for grain yield resulted in a poor co.
Author: Publisher: ISBN: Category : Agriculture Languages : en Pages : 850
Book Description
Sept.-Oct. issue includes list of theses and dissertations for U.S. and Canadian graduate degrees granted in crop science, soil science, and agronomic science during the previous academic year.
Author: H.T. Buck Publisher: Springer ISBN: 9781402054969 Category : Science Languages : en Pages : 795
Book Description
Providing a unique overview to wheat and related species, this book comprises the proceedings of the 7th International Wheat Conference, held in Mar del Plata, Argentina, at the end of 2005. Leading scientists from all over the world, specialized in different areas that contribute to the better understanding of wheat production and use, review the present achievements and discuss the future challenges for the wheat crop.
Author: National Research Council Publisher: National Academies Press ISBN: 0309148960 Category : Technology & Engineering Languages : en Pages : 598
Book Description
In the last 20 years, there has been a remarkable emergence of innovations and technological advances that are generating promising changes and opportunities for sustainable agriculture, yet at the same time the agricultural sector worldwide faces numerous daunting challenges. Not only is the agricultural sector expected to produce adequate food, fiber, and feed, and contribute to biofuels to meet the needs of a rising global population, it is expected to do so under increasingly scarce natural resources and climate change. Growing awareness of the unintended impacts associated with some agricultural production practices has led to heightened societal expectations for improved environmental, community, labor, and animal welfare standards in agriculture. Toward Sustainable Agricultural Systems in the 21st Century assesses the scientific evidence for the strengths and weaknesses of different production, marketing, and policy approaches for improving and reducing the costs and unintended consequences of agricultural production. It discusses the principles underlying farming systems and practices that could improve the sustainability. It also explores how those lessons learned could be applied to agriculture in different regional and international settings, with an emphasis on sub-Saharan Africa. By focusing on a systems approach to improving the sustainability of U.S. agriculture, this book can have a profound impact on the development and implementation of sustainable farming systems. Toward Sustainable Agricultural Systems in the 21st Century serves as a valuable resource for policy makers, farmers, experts in food production and agribusiness, and federal regulatory agencies.
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Author: American Society of Agronomy
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Author: Greg Bowman
Author: H.T. Buck
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Author: National Research Council