Abstract
ABSTRACT THERE are about 4 million hectares of claypan soils in the Mid-west. These soils have a very slowly permeable clay subsoil which severely limits root development and water penetration. The crop yield on these soils is usually low because of limited water management. A water management simulation model, DRAINMOD, was used to investigate the suitability of controlled-drainage/subirrigation of corn on these soils. Several years of crop, soil and weather data collected on a clay pan soil in Illinois were used in this study. Various drain spacing and depth combinations for both good and poor surface drainage were simulated. Results indicated that the optimum drain spacing would be 6 m for controlled-drainage/subirrigation on these soils under good surface drainage and with a weir setting of 35 cm on a 5-year recurrence interval basis.
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