EFFECTS OF TEMPERATURE AND SOIL-WATER CONTENT DURING INCUBATION ON THE DESORPTION OF PHOSPHORUS FROM SOIL

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Abstract
The effect of time, temperature and soil-water content during incubation on the subsequent desorption of P from Bernow fine sandly loam (Glossic Paleudalfs) and Houston Black clay (Udic Pellusterts) was studied. Soils were incubated with 0, 47.5, 95, and 190 .mu.g P/g soil. The constants of a simplified model describing P desorption were not affected appreciably by incubation time (0-8 wk), temperature (5-25.degree. C), and water content (10-35% by weight). The major effect of these variables was on the amount of desorbable P remaining in the soil. An increase in incubation time temperature and in water content between 10 and 25%, resulted in a decrease in the amount of P desorbed. This was attributed to the effect of these variables on P sorption, by formation and stability of amorphous Fe and Al complexes and Ca precipitates. For predicition and application, the observed effects of soil temperature and water content could be described by simple functional relationships reported in the literature.
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