By Donald L. Sparks
Less than new editorial path, Advances in Agronomy either maintains its lengthy culture and expands to incorporate leading edge tools and applied sciences. best foreign scientists disguise issues in plant and soil sciences, biotechnology, terrestrial ecosystems, and environmental matters. the second one quantity below new editorial path, Advances in Agronomy, quantity forty seven specializes in environmental caliber and biotechnology. 4 articles on soil technology conceal acid deposition, chemical shipping, and floor complexation. articles on crop technological know-how survey sort fingerprinting and corn evolution. This and comparable volumes may be of curiosity to agronomists and biotechnologists in academe, undefined, and govt.
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Additional resources for Advances in Agronomy Volume 47
1985; Young and Bache, 1985; Thomas, 1988). Like the Al-hydroxy complexes, the exchange of A13+ and H + with soil organic matter provides the means for satisfying the requirements of Eq. , 1979). Using the approach of Cronan and his co-workers (1986), the exchange between H+ and A13+ in forest soil organic horizons can be expressed by an empirical model similar to Eq. (8), pAl = b(pH) + c (12) where both b and c are constants obtained from the regression lines for the plots pAl versus pH. The numerical value of both b and c are linearly related to the bound A1 ratio (moles of bound Al/total moles of carboxyl ACID DEPOSITION ON FORESTED SOILS 2s groups) in the soil organic matter.
1988a). Decreases in NO; have been the most dramatic, with concentrations decreasing by 60% within 2 weeks of excluding ambient precipitation from the treatment area. The decrease in SO:- has been more gradual, and has been accompanied by a 55% decrease in the 28 WAYNE P. ROBARGE AND DALE W. JOHNSON concentration of base cations in soil solution and a 45% increase in alkalinity. There has also been a decrease in A1 concentration in the soil solution, and an increase in the degree of dissociation of the dissolved organic acids, reflecting the reappearance of HCO; and dissolved organic matter as the dominant anions in the soil solution.
2. Cation Exchange and Aluminum Solubility Titration of forest soil mineral horizons results in an S-shaped relationship between pH and the amount of acid or base added in the pH 4-7 range (Federer and Hornbeck, 1985; Magdoff and Bartlett, 1985). 6 (Magdoff and Bartlett, 1985). 5) (Schwertmann and Fischer, 1982). The pH-dependent charge, or cation exchange buffering range, and the Al-release buffering range are actually interrelated, as they both depend on the nature of the exchange surfaces present in the mineral soil horizons.