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Dep. of Agronomy, Univ. of Kentucky, Lexington, KY 40546;
Dep. of Agric. Eng., Univ. of Kentucky, Lexington, KY 40546.
* Corresponding author.
ABSTRACT
As nonpoint source pollution of water becomes more evident, more concern is being focused on the effects of agricultural practices on water quality. This study evaluated the effects of conventional tillage (CT), chisel-plow tillage (CP), and no tillage (NT) on the quality of runoff water from a Maury silt loam soil (fine, mixed, mesic Typic Paleudalf) near Lexington, KY. The mean runoff rate, total runoff volume, mean sediment concentration, and total soil losses were significantly less for NT than for CP and CT. Concentration of NO–3, NH+3, and PO3–4 in the runoff water from NT were greater than from CP or CT. Concentration of atrazine [6-chloro-N-ethyl-N'-(I-methylethyl)-1,3, 5-triazine-2,4-diamine] in the runoff water tended to be higher from CP than from NT or CT. Total losses of NO–3, NH+4, PO3–4, and atrazine in runoff water were generally in the order CT > CP > NT. The sum of all chemicals lost was less than 3% of the total amount of each applied.
Contribution of Dep. of Agronomy, Univ. of Kentucky. Published as paper no. 92-3-154 with approval of the Director of Kentucky Agric. Exp. Stn., Lexington.
Received for publication August 10, 1992.
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