ABSTRACT:
We investigated the effects of rain infiltration rate and manure application rate on the quality of leachate and runoff from four soils. Tall fescue (Festuca arundinacea Schreber) plots received swine (Sus scrofa L) manure slurry at 1 or 2 Mg (dry weight) ha−1 to provide N at 78.4 or 156.8 kg ha−1. Simulated rain (75 mm hr−1) applied 24 hr after slurry application produced 30 min of runoff from each plot. Mean infiltration rates ranged from 7.7 to 60.6 mm hr−1. Concentrations and mass losses of total Kjeldahl nitrogen (TKN), NH4-N, dissolved reactive P (DRP), and total P in runoff increased significantly (α = 0.05) following slurry applications, and doubled when slurry application doubled. High infiltration rates reduced runoff volumes and runoff concentrations of Cl, total dissolved solids, DRP, TKN, and NH4-N. Concentrations of NO3-N and NH4-N in leachate water, collected at 0.4 m depth by suction cup lysimeters, did not increase following slurry applications.
Footnotes
Daniel H. Pote is with the USDA-ARS at the Dale Bumpers Small Farms Research Center in Arkansas. Benjamin A. Reed is with the USDA-NRCS in Lebanon, Missouri. Tommy C. Daniel is in the Department of Agronomy at the University of Arkansas. Doyle J. Nichols is with the USDA-ARS at the National Soil Tilth Laboratory in Ames, Iowa. Philip A. Moore, Jr. is with the USDA-ARS in Fayetteville, Arkansas. Dwayne R. Edward is in the Biosystems and Agricultural Engineering Department at the University of Kentucky, and Sandi Formica is with the Arkansas Department of Environmental Quality in Little Rock, Arkansas.
- Copyright 2001 by the Soil and Water Conservation Society
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