The assessment of optimum nitrogen (N) fertilizer need for winter wheat (Triticum aestivum L.) is important for economic and environmental sustainability. A comprehensive understanding of fertilizer N requirement depends on estimation of the quantity of N needed by the crop vers…
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Although the main limitation of crop production in the arid and semiarid regions of Morocco is lack of sufficient rainfall, phosphorus (P) nutrient deficiencies also are major obstacle to maximum crop production. Fertilizer management is an important step in sustainability of cr…
Paddy-soils in Java, Indonesia, have been intensively fertilized with phosphate for at least three decades through centralized government programs, which provide subsidized intensification packets to farmers. One side effect of these programs has been an excessive accumulation o…
A hydrogeological study, during the period from June, 1991 to June, 1992, in the clay-soil mantled portion of a limestone terrain in southern Indiana showed a major movement of nitrate in quick pulses through the unsaturated zone immediately after a major storm event on April 15…
For the past three decades, African agricultural crop production has been increasing. However, much of exhibited growth has come from additional harvested land rather than the increased yield per hectare. This paper studies crop production of the world, African in general, East …
Much of agricultural research concerns the relationship between the agroecological environment and the application of purchased inputs. In highly variable environments, economic models of intra-seasonal input decisions should incorporate the stochastic nature of biological respo…