By P. M. Huang (auth.), B. A. Stewart (eds.)

Advances in Soil technological know-how is a evaluate sequence correct to all parts of soil technology. those studies, meant essentially for scientists, academics, and scholars of soil technology, additionally offer technical heritage details for lots of extra staff and teams drawn to our average assets and man's impression on them. this is often the 8th quantity within the sequence with a world record of participants from the us, India, Canada and New Zealand. It includes 4 evaluate chapters at the following matters: elements affecting aluminum alterations in soil; soil productiveness in dryland areas of constructing international locations; alterations in soil constitution lower than assorted cropping structures; homes and administration of the depleted soils of India. those contributions current beneficial details on a variety of subject matters and function an outstanding resource of references.

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Epub ISBN: 9781616149345

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Impact of environmental Al chemistry on human health (Huang, 1987b; reprinted with permission of Soil Science Society of America). 1963b; Rich, 1968) or external surfaces of phyllosilicates (Huang and Kozak, 1970) or transformed to aluminum hydroxide polymorphs (Hsu, 1977) and short-range ordered precipitation products of aluminum (Huang and Violante, 1986). , 1962). Hydroxy-interlayered smectite and vermiculite occur in soils as a product of weathering reactions. These minerals may result from degradation of chlorite or deposition of hydroxy materials in the interlayers of expansible phyllosilicates.

Ppt. 0 ~ ~ rJ> g ~. ~ ~ ::;l 9 ~ ::l §. ~ ~ ~. l 'Tl o ~. v. v. v. v. v. v. v. v. v. v. v. Source: Violante and Huang (1984); reprinted with permission of the Soil Science Society of America. aOnly the d-spacings with a III, 2: 15 are reported (ASTM card no. 21-1307); f3 = breadth (2 8) measured at half-maximum intensity; f3 and 2 8 position were measured according to the procedures described by Tettenhorst and Hofmann (1980). bR is the initialligandlAI molar ratio. eNot determinable (the peak is visible, but the f3 value is difficult or impossible to determine).

The crystallization of Al hydroxides is delayed or inhibited by the presence of low-molecular-weight organic acids (Kwong and Huang, 1975, 1977, 1979b) and tannic acid (Kwong and Huang, 1981). M. Huang 26 Figure 9. 0 x 10- 4 M tannic acid. ). small amounts of the flavone quercetin (Lind and Hem, 1975). Through these functional groups, fulvic acid can form stable complexes with Al and prevent the crystallization of AI(OHh (Kodama and Schnitzer, 1980). The influence of fulvic acid on the crystallization of Al hydroxides also resembles that of salts (Hsu, 1967) in that fulvic acid appears to favor the formation of AI-O-AI (oxo) over that of /OH~ Al Al .......

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