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Full-Text Articles in Life Sciences
Modeling An Improvement In Phosphorus Utilization In Tropical Agriculture, David Edelstein, David J. Tonjes
Modeling An Improvement In Phosphorus Utilization In Tropical Agriculture, David Edelstein, David J. Tonjes
Technology & Society Faculty Publications
Studies of Terra Preta soils have generated interest in recreating their fertility elsewhere. Much of the research has focused on soil amendment charcoal (“biochar”). Terra Preta also contains bone fragments, producing a high concentration of phosphorus. Some forecast worldwide declines in phosphorus supplies, and better agricultural system management is required to improve phosphorus use efficiency. A conceptual model is offered to consider the influence of charcoal on bioavailability of phosphorus. The model describes a system where improvements in the chemical and biological condition of the soil result in increased phosphorus availability and cycling. Mechanisms of phosphorus/charcoal interaction are considered, and …
Biomass Yield And Nutrient Responses Of Switchgrass To Phosphorus Application, M. K. Kering, J. T. Biermacher, T. J. Butler, J. Mosali, John A. Guretzky
Biomass Yield And Nutrient Responses Of Switchgrass To Phosphorus Application, M. K. Kering, J. T. Biermacher, T. J. Butler, J. Mosali, John A. Guretzky
Department of Agronomy and Horticulture: Faculty Publications
Increasing desire for renewable energy sources has increased research on biomass energy crops in marginal areas with low potential for food and fiber crop production. In this study, experiments were established on low phosphorus (P) soils in southern Oklahoma, USA to determine switchgrass biomass yield, nutrient concentrations, and nutrient removal responses to P and nitrogen (N) fertilizer application. Four P rates (0, 15, 30, and 45 kg Pha−1) and two N fertilizer rates (0 and 135 kg Nha−1) were evaluated at two locations (Ardmore and Waurika) for 3 years.While P fertilization had no effect on yield …
Sensing Development Of A Soybean Canopy Under P Or K Nutritional Stress, Martin M. Navarro
Sensing Development Of A Soybean Canopy Under P Or K Nutritional Stress, Martin M. Navarro
Theses and Dissertations--Plant and Soil Sciences
The normalized difference vegetative index (NDVI) has been correlated with physiological plant parameters and used to evaluate plant growth. There is little information about the use of this technique to detect soybean nutrient deficiencies. The objective of this work was to determine the ability of the NDVI sensor to detect P and K deficiencies, and grain yield reduction, in soybean. During 2010 and 2011, NDVI measurements were made on a soybean field trial site known to exhibit yield responses to both P and K nutrition. Four replicates of 8 levels each of P and K nutrition were evaluated. The NDVI …