By S. K. Sanyal, S. K. De Datta (auth.), B. A. Stewart (eds.)

This well-reviewed and lively sequence provides examine summaries on points of soil technology that are as diversified because the topic itself, and diversity via actual, chemical and organic methods to the learn of soils. quantity sixteen includes articles facing the position of phosphorus in soil, modeling of chemical absorption in soils, exams to figure out nutrient availability and point toxicity in soils, the consequences of sewage sludge on soil microbes, and techniques to estimate soil water retention in keeping with actual houses of soil.

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1967) implies an absorption of the initially adsorbed P. This process can also account for a decrease in the ease of isotopic exchange and P desorption (Ryden and Pratt, 1980). In a recent study, such slow P fixation reaction is also shown to be affected by the calcium carbonate content (Solis and Torrent, 1989). On the other hand, by studying the slow reaction of P with aggregated particles of ferrihydrite, Willett et aI. (1988) ruled out the possibility of penetration of P into the crystal lattice, and instead attributed the slow reaction to the migration ofP to surface sorption sites of decreasing accessibility within the aggregates.

Khasawneh and Doll (1978) listed soil factors, such as soil pH, soil Ca, soil P, soil texture, and soil organic matter content, as factors affecting the PR dissolution in soils. The influence of soil exchangeable Ca on PR dissolution in soil, however, needs careful attention because many studies have evaluated Ca in relation to liming at various soil pH (Khasawneh, 1977, cited in Khasawneh and Doll, 1978). Wilson and Ellis (1984), on the other hand, investigated the solubility of several PRs in neutral normal ammonium citrate solutions with varying Ca2+ ion activity.

Based on their studies, Havlin and Westfall (1984) suggested that under field conditions, octacalcium phosphate or a mineral of similar solubility was the metastable mineral phase accumulating on the surface of the Pfertilized soils. At the Olsen P level, of < 32 mgjkg, however, fJ-tricalcium phosphate apparently controlled P solubility in soils. , 1986). The kinetic rates ofHA precipitation being slow, a role of kinetic inhibitors has been suggested to control the precipitation rate of HA in soils (Aoba and Moreno, 1985).

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