FIXATION OF AMMONIUM IN DIFFICULTLY EXCHANGEABLE FORM UNDER MOIST CONDITIONS BY SOME SOILS OF SEMIARID REGIONS

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Abstract
Studies involving detns. of the amts. of NH4 fixed under moist conditions, the effect of NH4 fixation upon cation-exchange capacity, and the relation of NH4 fixation to K fixation were made on a group of soil samples from semi-arid regions. When NH4Cl was applied at the rate of 10 me. per 100 g. of soil, the amts. of NH4 fixed by various samples against extraction by 0.5 [image] KC1 ranged from 0 to 6.2 me. per 100 g. Of the 21 samples studied, 15 fixed appreciable amts. of NH4. By comparing the amts. of NH4 and K fixed under similar conditions, and by studying the influence of K additions on NH4 fixation, it is concluded that under moist conditions the soils studied fix these cations by essentially the same mechanism. Results are presented showing that fixation of NH4 causes a corresponding reduction in cation-exchange capacity and that the neutral N ammonium acetate method for the detn. of cation-exchange capacity gives low values when applied to soils which fix NH4 under moist conditions.

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