Nitrogen Management in Agricultural Soils

Profitable crop production largely depends on adequate amounts of available nitrogen. In continuous corn, for example, the dollar return per one dollar invested in nitrogen fertilizer can be as high as eight to one. However, as beneficial and profitable as nitrgoen fertilizer is to crop production, continued inputs of nitrogen fertilizers have increasingly been a concern regarding occurrence of nitrates in ground and surface waters. Consequently, both crop production economics and environmental concerns necessarily demand increasing the judicious and efficient use of nitrogen fertilizers.