AMMONIUM AND POTASSIUM FIXATION AND RELEASE IN SELECTED SOILS OF SOUTHEASTERN UNITED STATES

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Abstract
Ammonium and K were fixed in 14 surface soils and then removed by chemical extraction, cropping, and, in case of NILj, by nitrification. Although an average of 20% of the fixed NH4 was nitrified during a 4 month incubation period, the soil containing the most fixed NH4 did not nitrify more N than the check. Six crops of oats did not indicate removal of the fixed NH* but analysis of the cropped soil did. There was a good correlation (R2= 0.813) between loss of NH4 and that extracted by NaCl. In the case of fixed K, there was a good correlation (R2= 0.796) between that removed by 6 oat crops and that removed by MgCl2. Although the soils employed varied widely in clay mineralogy, percentage clay, and organic matter content, the release of both fixed NH/ and K was related mainly to the amount of NH4 and K fixed.

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