Effects of temperature and soil-water content during incubation on the desorption of phosphorus from soil
1982
Sharpley, Andrew N. | AHUJA, L. R.
We studied the effect of time, temperature, and soil-water content during incubation on the subsequent desorption of phosphorus from Bernow fine sandy loam (Glossic Paleudalfs) and Houston Black clay (Udic Pellusterts). Soils were incubated with 0, 47.5,95, and 190 micrograms P/gram soil. The constants of a simplified model describing P desorption were not affected appreciably by incubation time (0 to 8 weeks), temperature (5 to 25°C), and water content (10 to 35 percent by weight). The major effect of these variables was on the amount of desorbable P remaining in the soil. An increase in incubation time and temperature and in water content between 10 and 25 percent, 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 iron and aluminum complexes and calcium precipitates. For prediction 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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