Modern agriculture has become heavily dependent on fossil-fuel-based commercial nitrogen (N) for maintaining soil fertility and high crop yields. In the past, farmers have not had the means to monitor soils routinely for N concentrations, nor have they been able to match yield goals to those concentrations. In addition, the nutrient value of manure applied to fields often is not taken into account before commercial N fertilizer is applied. As a result, N has been over-applied on many midwestern farms, prompting concerns about the cost of commercial inputs into farming and the amount of nitrate in groundwater.
Delmar Vander Zee
Ronald J. Vos, Christian L. Goedhart
Year of Grant Completion
Vander Zee, Delmar; Vos, Ronald J.; and Goedhart, Christian L., "Monitoring and modeling cropping system nitrogen for a sustainable agriculture" (1992). Leopold Center Completed Grant Reports. 1.