Abstract
ABSTRACT Laboratory rainfall simulation experiments were conducted to determine rainfall interception by corn and soybean residue. Rainfall intensities of 25.4, 63.5, and 127 mm/hr for durations up to 60 min were applied to 54 replications of residue. Com and soybean residue intercepted an average depth of 1.55 mm and 1.03 mm, respectively, for rainfall duration of 60 min and averaged over all intensities. Approximately one-half of the rainfall amount during the first 2 min of a 25.4 mm/h intensity storm was intercepted by residue; about one-third and one-tenth of the 63.5 and 127 mm/h intensity rainfall, respectively, was intercepted by residue. Rainfall interception by residue was a significant portion of total rainfall depth for storms having durations up to 36 min and depending on rainfall intensity. Rainfall intensities of 25.4 to 127 mm/h had little effect on the rate of rainfall interception by residue. An empirical equation that relates rainfall interception of corn or soybean residue to cumulative rainfall was developed.
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