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Nutrient Content of Barnlot Runoff Water¹

ABSTRACT

From March 1968 through December 1970, runoff from a 60-head beef cattle barnlot was measured and concentrations of nitrate, total nitrogen, phosphorus, and potassium in solution were determined. Nitrate-nitrogen concentration was < 2 mg/liter for 8 months of the year, with the highest monthly concentration 6 mg/liter. Most of the soluble N was in a reduced form with the maximum monthly concentration < 70 mg/liter. Phosphorus concentration was 5 mg/liter during the spring and early summer, with a peak near 14 mg/liter in September. Monthly potassium concentration was always > 100 mg/liter with peak values > 300 mg/liter.

Nitrate concentration was highest during warm months when environmental conditions favored oxidation. Concentration of all other nutrient forms decreased during the summer when the barnlot was not being used by cattle.

Key Words: barnlot • feedlot • runoff quality • watershed

¹ Contribution from the North Appalachian Experimental Watershed, Corn Belt Branch, Soil and Water Cons. Res. Div., ARS, USDA, Coshocton, Ohio; in cooperation with the Ohio Agr. Res. and Dev. Cent, Wooster, Ohio, and the U. S. Soils Lab., Plant Industry Sta., Beltsville, Md.

² Soil Scientist, USDA and Assistant Professor, OARDC; Chemical Technician, USDA; and Soil Scientist, USDA, respectively.

Received for publication December 20, 1971.