By Donald L. Sparks
Lower than new editorial course, Advances in Agronomy either maintains its lengthy culture and expands to incorporate leading edge equipment and applied sciences. top foreign scientists disguise subject matters in plant and soil sciences, biotechnology, terrestrial ecosystems, and environmental concerns.The moment quantity less than new editorial path, Advances in Agronomy, quantity forty seven makes a speciality of environmental caliber and biotechnology. 4 articles on soil technological know-how disguise acid deposition, chemical delivery, and floor complexation. articles on crop technological know-how survey type fingerprinting and corn evolution. This and similar volumes should be of curiosity to agronomists and biotechnologists in academe, undefined, and executive. Key beneficial properties* Acidic deposition in forested soils* Modeling natural and inorganic chemical shipping in soils* floor complexation versions in soil chemical platforms* Fingerprinting crop kinds* Evolution of corn
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Extra info for Advances in Agronomy, Vol. 47
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.
The relatively rapid response to acidic inputs in sensitive soils observed in the RAIN project suggests that similar rapid changes may also occur in plant nutrient availability and uptake. Such changes may appear as anomalies in the chemical composition of plant parts, such as the bole wood of trees, that serve as passive monitors of soil nutrient status over time (Momoshima and Bondietti, 1990). In long-lived, relatively undisturbed ecosystems, the cycling of base cations, especially Ca2+,between the forest floor and the overlying canopy is relatively constant (Momoshima and Bondietti, 1990).
Regardless of the exact mechanism controlling A1 solubility in forest soil horizons, Eqs. ( 5 ) and (7) can be combined to generate the curvilinear relationship between BS and pH shown in Fig. 3. Using the convention of Reuss and his co-workers (1990), the combined equation can be obtained by substituting the right-hand side of Eq. (7) for (A13+)in Eq. (5). , 1990). The exact shape of the curvilinear relationship predicted by Eq. (14) is a function of the constant a , whereas the position of the curve on the pH and BS axes is a function of K,,, KA, and ionic strength [(3/2a) log(Ca2+)].
Advances in Agronomy, Vol. 47 by Donald L. Sparks