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Submitted to: Crop Simulation Workshop Abstracts
Publication Type: Abstract Only Publication Acceptance Date: 3/21/1995 Publication Date: N/A Citation: N/A Interpretive Summary: Technical Abstract: Materials applied to the soil must remain in place long enough to accomplish the purpose for which they were applied, but long-lived materials can cause problems with subsequent crops or environmental pollution (e.g. contamination of runoff and/or groundwater, atmosphere, etc.). From both a pollution control and a production management point of view, knowledge of the relative rates of two main processes is of primary interest. These are: a) degradation (or chemical transformation) of materials at the site of application - perhaps aided by microbial processes and b) movement away from the application site - perhaps volatilization, leaching, or dissolved in surface runoff. Often a combination of processes affects material applied to the soil. As with many complex interaction problems, numerical simulation techniques may provide a basis for estimating the relative importance of competing physical and chemical processes. Owing to the relative abundance of published analytical data and the relative safety of field application experiments, nitrogen fertilizer application was chosen as a surrogate for many soluble pesticides. Field data and modeling experiments include both 1- and 2-dimensional soil profile descriptions. |
