S. K. Sanyal, S. K. De Datta (auth.), B. A. Stewart (eds.)'s Advances in Soil Science PDF

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

ISBN-10: 1461231442

ISBN-13: 9781461231448

ISBN-10: 1461278120

ISBN-13: 9781461278122

This well-reviewed and energetic sequence provides examine summaries on features of soil technological know-how that are as assorted because the topic itself, and diversity via actual, chemical and organic techniques to the examine of soils. quantity sixteen comprises articles facing the function of phosphorus in soil, modeling of chemical absorption in soils, exams to figure out nutrient availability and aspect toxicity in soils, the results of sewage sludge on soil microbes, and techniques to estimate soil water retention in line with actual houses of soil.

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1. Mineralogy of Phosphate Rocks Phosphate rock deposits may be of igneous, metamorphic, or sedimentary type. Although most commercial deposits are of sedimentary marine PR, but a significant amount of phosphorus (P) is also obtained from alkaline igneous complexes and residual deposits obtained on weathering of sedimentary phosphatic limestones and igneous carbonatite complexes (Notholt, 1975). According to McClellan and Gremillion (1980), PRs may be classified into three broad classes according to their mineralogical composition: 1.

Dissolution of Phosphate Rocks in Soil The extent and rate of PR dissolution is primarily important in determining its effectiveness when directly applied as fertilizer. A better understanding of the reactions of PR in soils will be useful in assessing on which soils PR sources could be best used. Several factors, some of which are interrelated, influence PR dissolution in soil. a. , 1986; Kanabo and Gilkes, 1988; Chien and Hammond, 1989). , 1986): Ca10(P04)6FZ + 12H+ = 10Ca2+ + 6H z P04 + 2F-.

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.

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Advances in Soil Science by S. K. Sanyal, S. K. De Datta (auth.), B. A. Stewart (eds.)

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