Simulating the Effects of Soil Depth and Climatic Factors on Corn Yield
1987
Swan, J. B. | Shaffer, M. J. | Paulson, W. H. | Peterson, A. E.
Simulation models are needed to estimate crop yield responses to climate and soil water storage. Measured corn yields (Zea Mays L.) from a tillage-residue management study on the Univ. of Wisconsin Lancaster Exp. Stn. were compared to simulated yields determined using the Nitrogen-Tillage-Residue Management (NTRM) simulation model. Data collected at the site from 1982 to 1985 on crop, soil, climate, and management charactertistics were utilized in the model. A significant interaction effect on corn yield was observed between climate and soil-water-holding capacity of individual plots. In 1983, 1984, and 1985 corn yields increased as soil depth to red clay residuum increased; in 1981 and 1982 corn yield had little relationship to soil depth to residuum. The observed differential effect of soil depth to residuum on corn yield under different years' climatic conditions necessitated the use of a simulation model to estimate corn yield accurately in a given year and to express the probability of obtaining a given yield level. Frequency distributions for grain yield were determined for specific soil depths to residuum. Grain yield was determined as a function of soil depth for specific probability levels based on simulated site-specific daily climatic values generated for a 100-yr period.
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