BC4 FRONT COVER REV1.indd
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B et te r C ro ps /V ol . 9 7 (2 01 3, N o. 4 ) Silicon is a major component of sand, silt and clay minerals. Because of this abundance, it typically has not been considered as a limiting factor in soil fertility. However numerous fi eld studies have shown that supplying crops with adequate plant-available Si can suppress plant disease, reduce insect attack, improve environmental stress tolerance, and increase crop productivity.
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BC4 FRONT COVER REV1.indd
The need for precise and responsive management of N fertilizer in corn production is compelling for both economic and environmental reasons, but the optimum N rate remains an elusive notion. Economically optimal N rates (EONR) in much of North America may range from zero to 225 lb/A (Scharf et al., 2006; Sawyer et al. 2006), and may vary as the growing season progresses (van Es et al., 2007). M...
متن کاملBC4 FRONT COVER REV1.indd
The need for precise and responsive management of N fertilizer in corn production is compelling for both economic and environmental reasons, but the optimum N rate remains an elusive notion. Economically optimal N rates (EONR) in much of North America may range from zero to 225 lb/A (Scharf et al., 2006; Sawyer et al. 2006), and may vary as the growing season progresses (van Es et al., 2007). M...
متن کاملBC4 FRONT COVER REV3.indd
Nitrogen fertilization is essential for optimizing crop yields and economic returns in irrigated cropping systems in the Central Great Plains area of the USA. However, N application generally increases the emissions of the potent greenhouse gas, N 2 O, from these systems. Nitrous oxide is produced through nitrifi cation and denitrifi cation processes in the soil. Agriculture contributes approxi...
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Abbreviations and Notes: N = nitrogen; P = phosphorus; K = potassium; Ca = calcium; Fe = iron; Si = silicon. The Origins of Biodynamic Agriculture Biodynamics is system of agricultural management based on a series of lectures given by Rudolf Steiner in 1924. A philosopher by training, Steiner sought to infl uence organic life on earth through cosmic and terrestrial forces via nine preparations ...
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