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

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

This well-reviewed and lively sequence offers study summaries on facets of soil technological know-how that are as different because the topic itself, and variety 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, checks to figure out nutrient availability and point toxicity in soils, the consequences of sewage sludge on soil microbes, and strategies to estimate soil water retention in keeping with actual houses of soil.

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A correlation between initial P adsorption and free iron oxides was reported by Ayodele and Agboola (1981), Pena and Torrent (1984), Torrent (1987), Mehadi and Taylor (1988), Manikandan and Sastry (1988), and Solis and Torrent (1989). A. Sanyal et al. (1990) obtained significant correlation of free iron oxide (active iron) with the Langmuir adsorption maximum and the Freundlich k (Table 2). The bonding energy, on the other hand, was not correlated. It was also less strongly correlated with the clay and the organic matter contents of the soils as compared with the above two indexes of P sorption (Table 2).

Hence, it is suggested to discard the first extract with citrate and use the second successive extract in evaluating apatite-bound P in the rock (Chien and Hammond, 1978a; Khasawneh and Doll, 1978). Also, sequential extractions used by MacKay et ai. (1984) can be used to estimate the agronomic potential of the PRo The influence of other accessory minerals (for example, siliceous minerals) on the results of chemical solubility tests of PR materials has been discussed by Hammond et ai. (1986).

The experimental data as well as the kinetic models showed that high pH values, low concentrations of P in the reacting solution, and small specific surface area will reduce retention of P. For the minerals studied in this experiment, gibbsite was found to be most sensitive to variations of these three factors. Goethite was found to rank next in sensitivity, although its P retention capacity was less than that of kaolinite, due presumably to its greater tendency for desorption. A simplified soil and plant P model by Jones et ai.

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