The Experts below are selected from a list of 111 Experts worldwide ranked by ideXlab platform
Patrick J Horn - One of the best experts on this subject based on the ideXlab platform.
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the impact of Seed size and chemical composition on Seedling vigor yield and fiber quality of cotton in five production environments
Field Crops Research, 2016Co-Authors: John L Snider, Kent D Chapman, Guy D Collins, Jared Whitaker, Patrick J HornAbstract:Abstract Seed mass and oil content of the quiescent cotton Seed are positively associated with Seedling vigor. In contrast, Seed size has been negatively associated with lint yield due to selection for cultivars with greater lint percent. The current study addressed the hypothesis that Planting Seed mass and total oil + protein calorie content of the quiescent cotton Seed would be strongly predictive of Seedling vigor across most field conditions and that the impact of Seed traits on yield would be dependent upon yield environment. When considered in each yield environment, Seedling vigor was positively associated with Seed size and the total oil + protein calorie content per Seed in four out five environments tested. Regression analysis of cultivar mean oil + protein kcal content per Seed versus Seedling vigor across all environments indicated a strong, positive relationship between the two parameters (r2 = 0.65). Although lint percent was positively correlated with lint yield in every environment, Planting Seed mass and calorie content were not correlated with lint yield in four of the five environments tested or when cultivar means for lint yield and Seed characteristics were averaged across all environments. Thus, it is concluded that individual Planting Seed mass and total energy content for oil + protein are strong predictors of early Seedling vigor. Furthermore, selecting commercially available cultivars with characteristics indicative of Seedling vigor does not appear to limit lint yield in most environments tested.
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effects of nitrogen and Planting Seed size on cotton growth development and yield
Agronomy Journal, 2013Co-Authors: Christopher L Main, Tomas L Barber, Randall K Boman, Kent D Chapman, Darrin M Dodds, Stewart Duncan, Keith L Edmisten, Patrick J Horn, Michael A Jones, Gaylon D MorganAbstract:A standardized experiment was conducted during 2009 and 2010 at 20 location-years across U.S. cotton (Gossypium hirsutum L.)-producing states to compare the N use requirement of contemporary cotton cultivars based on their Planting Seed size. Treatments consisted of three cotton varieties with Planting Seed of different numbers of Seed per kg and N rates of 0, 45, 90, and 134 kg ha–¹. Soil at each trial location was sampled and tested for nitrate presence. High levels of soil nitrate (>91 N-NO₃– kg ha–¹) were found in Arizona and western Texas, and soil nitrate in the range of 45 to 73 kg N-NO₃– ha–¹ was found at locations in the central United States. Cotton lint yield responded to applied N at 11 of 20 locations. Considering only sites that responded to applied N, highest lint yields were achieved with 112 to 224 kg ha–¹of applied plus pre-plant residual soil NO₃—translating to an optimal N requirement of 23 kg ha–¹ per 218 kg bale of lint produced. Among the varieties tested those with medium-sized Seed produced higher yields in response to N than did larger and smaller Seeded varieties. Varieties with larger Seed had longer and stronger fibers, higher fiber length uniformity than small Seeded varieties and decreased micronaire. Seed protein and oil increased and decreased slightly in response to increasing amounts of soil nitrate plus applied N, respectively.
Kent D Chapman - One of the best experts on this subject based on the ideXlab platform.
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the impact of Seed size and chemical composition on Seedling vigor yield and fiber quality of cotton in five production environments
Field Crops Research, 2016Co-Authors: John L Snider, Kent D Chapman, Guy D Collins, Jared Whitaker, Patrick J HornAbstract:Abstract Seed mass and oil content of the quiescent cotton Seed are positively associated with Seedling vigor. In contrast, Seed size has been negatively associated with lint yield due to selection for cultivars with greater lint percent. The current study addressed the hypothesis that Planting Seed mass and total oil + protein calorie content of the quiescent cotton Seed would be strongly predictive of Seedling vigor across most field conditions and that the impact of Seed traits on yield would be dependent upon yield environment. When considered in each yield environment, Seedling vigor was positively associated with Seed size and the total oil + protein calorie content per Seed in four out five environments tested. Regression analysis of cultivar mean oil + protein kcal content per Seed versus Seedling vigor across all environments indicated a strong, positive relationship between the two parameters (r2 = 0.65). Although lint percent was positively correlated with lint yield in every environment, Planting Seed mass and calorie content were not correlated with lint yield in four of the five environments tested or when cultivar means for lint yield and Seed characteristics were averaged across all environments. Thus, it is concluded that individual Planting Seed mass and total energy content for oil + protein are strong predictors of early Seedling vigor. Furthermore, selecting commercially available cultivars with characteristics indicative of Seedling vigor does not appear to limit lint yield in most environments tested.
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effects of nitrogen and Planting Seed size on cotton growth development and yield
Agronomy Journal, 2013Co-Authors: Christopher L Main, Tomas L Barber, Randall K Boman, Kent D Chapman, Darrin M Dodds, Stewart Duncan, Keith L Edmisten, Patrick J Horn, Michael A Jones, Gaylon D MorganAbstract:A standardized experiment was conducted during 2009 and 2010 at 20 location-years across U.S. cotton (Gossypium hirsutum L.)-producing states to compare the N use requirement of contemporary cotton cultivars based on their Planting Seed size. Treatments consisted of three cotton varieties with Planting Seed of different numbers of Seed per kg and N rates of 0, 45, 90, and 134 kg ha–¹. Soil at each trial location was sampled and tested for nitrate presence. High levels of soil nitrate (>91 N-NO₃– kg ha–¹) were found in Arizona and western Texas, and soil nitrate in the range of 45 to 73 kg N-NO₃– ha–¹ was found at locations in the central United States. Cotton lint yield responded to applied N at 11 of 20 locations. Considering only sites that responded to applied N, highest lint yields were achieved with 112 to 224 kg ha–¹of applied plus pre-plant residual soil NO₃—translating to an optimal N requirement of 23 kg ha–¹ per 218 kg bale of lint produced. Among the varieties tested those with medium-sized Seed produced higher yields in response to N than did larger and smaller Seeded varieties. Varieties with larger Seed had longer and stronger fibers, higher fiber length uniformity than small Seeded varieties and decreased micronaire. Seed protein and oil increased and decreased slightly in response to increasing amounts of soil nitrate plus applied N, respectively.
John L Snider - One of the best experts on this subject based on the ideXlab platform.
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the impact of Seed size and chemical composition on Seedling vigor yield and fiber quality of cotton in five production environments
Field Crops Research, 2016Co-Authors: John L Snider, Kent D Chapman, Guy D Collins, Jared Whitaker, Patrick J HornAbstract:Abstract Seed mass and oil content of the quiescent cotton Seed are positively associated with Seedling vigor. In contrast, Seed size has been negatively associated with lint yield due to selection for cultivars with greater lint percent. The current study addressed the hypothesis that Planting Seed mass and total oil + protein calorie content of the quiescent cotton Seed would be strongly predictive of Seedling vigor across most field conditions and that the impact of Seed traits on yield would be dependent upon yield environment. When considered in each yield environment, Seedling vigor was positively associated with Seed size and the total oil + protein calorie content per Seed in four out five environments tested. Regression analysis of cultivar mean oil + protein kcal content per Seed versus Seedling vigor across all environments indicated a strong, positive relationship between the two parameters (r2 = 0.65). Although lint percent was positively correlated with lint yield in every environment, Planting Seed mass and calorie content were not correlated with lint yield in four of the five environments tested or when cultivar means for lint yield and Seed characteristics were averaged across all environments. Thus, it is concluded that individual Planting Seed mass and total energy content for oil + protein are strong predictors of early Seedling vigor. Furthermore, selecting commercially available cultivars with characteristics indicative of Seedling vigor does not appear to limit lint yield in most environments tested.
S.l. Chowdhury - One of the best experts on this subject based on the ideXlab platform.
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Improved cropping systems for rainfed agriculture in India
Field Crops Research, 2003Co-Authors: E.d. Spratt, S.l. ChowdhuryAbstract:Abstract In 1970, 23 agricultural research units were established in India to develop dryland cropping techniques in eight differing soil/climatic zones. The production potential of various rainfed (non-irrigated) crops has been established and new cropping systems devised to help farmers make better use of the soil and climatic resources of each agro-ecological zone. The cropping methods used by local farmers were compared each season with the integrated techniques evolved from crop management research at each research unit. The farmers' own labor, bullocks and equipment were used. Yields were increased substantially by improved varieties, good sowing methods, weed control and fertilizer use. In addition, environmental resources could often be further exploited by growing intercrops and sequential crops. Sequential cropping is traditionally practiced in regions receiving over 1000 mm of rainfall per annum, but there is a great potential for two crops per year in areas now considered marginal, through the introduction of timely Seeding and short-durati varieties and crops. Various comparative experiments confirmed that yields could be increased by judiciously and carefully executing management inputs such as advancing the date of sowing, using good Seed, Planting Seed uniformly and at the correct depth (into moist soil) to obtain recommended plant populations, and thorough weeding. This type of management was necessary to obtain additional crop responses to costly inputs such as fertilizers and water management.
Jared Whitaker - One of the best experts on this subject based on the ideXlab platform.
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the impact of Seed size and chemical composition on Seedling vigor yield and fiber quality of cotton in five production environments
Field Crops Research, 2016Co-Authors: John L Snider, Kent D Chapman, Guy D Collins, Jared Whitaker, Patrick J HornAbstract:Abstract Seed mass and oil content of the quiescent cotton Seed are positively associated with Seedling vigor. In contrast, Seed size has been negatively associated with lint yield due to selection for cultivars with greater lint percent. The current study addressed the hypothesis that Planting Seed mass and total oil + protein calorie content of the quiescent cotton Seed would be strongly predictive of Seedling vigor across most field conditions and that the impact of Seed traits on yield would be dependent upon yield environment. When considered in each yield environment, Seedling vigor was positively associated with Seed size and the total oil + protein calorie content per Seed in four out five environments tested. Regression analysis of cultivar mean oil + protein kcal content per Seed versus Seedling vigor across all environments indicated a strong, positive relationship between the two parameters (r2 = 0.65). Although lint percent was positively correlated with lint yield in every environment, Planting Seed mass and calorie content were not correlated with lint yield in four of the five environments tested or when cultivar means for lint yield and Seed characteristics were averaged across all environments. Thus, it is concluded that individual Planting Seed mass and total energy content for oil + protein are strong predictors of early Seedling vigor. Furthermore, selecting commercially available cultivars with characteristics indicative of Seedling vigor does not appear to limit lint yield in most environments tested.