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Thesis (M.S.)--University of Nebraska--Lincoln, 1961. Department of Agronomy.


Copyright 1961, the author. Used by permission.


Many investigators have proposed the use of an incubation technique to measure the amount of available nitrogen delivered by a soil as a means for predicting nitrogen needs of crops to be grown. Method of pretreatment and length of incubation are known to influence magnitude of nitrate production obtained. Therefore, the effect of various conditioning periods and different lengths of incubation upon the nitrate-producing capacity of Nebraska soils as function of date of sampling was studied. Since the incubation technique involves a series of nitrogen transformations, a second study was initiated to elucidate the status of fixed and exchangeable ammonium in relation to moisture level over several different incubation periods.

Advisor: R. A. Olson.