ABSTRACT:
Water infiltration rates were compared between simulated porous and nonporous residue pieces at 0, 25, and 50% soil cover at the end of 1 hr of simulated rainfall applied at 61 mm/hr (2.4 in/hr). All but two of the 12 paired comparisons had a statistically significant (p < 0.05) or nearly significant increase in infiltration rates as cover increased. While porous residue tended to result in higher infiltration rates than nonporous cover, the results were not significant. There was no advantage of having cover pieces, 10 × 42 cm (4 × 16 in), compared to 5 × 42-cm (2 × 16-in) pieces. The data did not support the published equations of Koon et al. (1970), which equated residue perimeter with infiltration rate.
Footnotes
R.A. Kohl and T.E. Schumacher are professors in the Plant Science Department, South Dakota State University, Brookings, South Dakota.
- Copyright 1999 by the Soil and Water Conservation Society
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