Abstract
ABSTRACT THE spatial and temporal dependence of soil water regime associated with different drain spacings on naturally poorly-drained Clermont silt loam in southeastern Indiana was characterized in 1986 and 1987. Effects of distance from the drain were more apparent in the drier mid-growing season periods than in the early part of the seasons due to the carryover of antecedent moisture and differential redistribution rates of soil water. The practical benefits of drainage on timeliness of tillage operations were quite small. The data indicate that a drain spacing of 20 m resulted in a drier soil moisture regime than a 40-m spacing but was not substantially different from 5- or 10-m drain spacings.
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