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Estimating Animal Waste Applications to Supply Crop Nitrogen Requirements¹

ABSTRACT

An equation was developed which estimates the amount of animal waste required to supply the desired amount of N for crops. This equation was based on annual mineralization rates which varied with time after application and with N content of the waste. When we calculated waste requirements to supply N needs using the equation, values were satisfactory for wastes containing 4% or less N. Residual N in soil fertilized with animal waste was closely correlated (r = 0.92) with values predicted by the equation.

¹ Contribution from Federal Research, Science and Education Administration, USDA, in cooperation with the Texas Agric. Exp. Stn., Texas A&M Univ.

² Soil Scientists, USDA Southwestern Great Plains Research Center, Bushland, TX 79012.

Received for publication July 27, 1978. Accepted for publication October 5, 1978.

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