INFLUENCE OF FERTILIZER AND MANURE ADDITIONS AND CROP ROTATIONS ON NONEXCHANGEABLE AMMONIUM CONTENT OF TWO SOILS

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Abstract
Levels of soil organic matter, N, and non-exchangeable ammonium were studied in plow layer samples taken at 2 locations in New York from field plots that have been subjected to differential fertilizer, manure, and cropping systems for at least 10 years. While the contents of soil organic matter and N increased as additions of N, P, and K were increased, the content of nonexchangeable ammonium showed no definite relationship. An inverse relationship between nonexchangeable ammonium and the amount of added fertilizer N was observed in the samples from one of the locations. The amounts of nonexchangeable ammonium that occured in the soils studied constituted about 9 to 25% of the total N. On the basis of the low fixation of added ammonium observed in these soils, the fixation of fertilizer N as NH4-N under field conditions is not likely to have a significant influence on the N economy of these New York soils on a long-term basis.

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