By Donald L. Sparks
Lower than new editorial course, Advances in Agronomy either maintains its lengthy culture and expands to incorporate cutting edge equipment and applied sciences. top foreign scientists conceal subject matters in plant and soil sciences, biotechnology, terrestrial ecosystems, and environmental concerns.The moment quantity less than new editorial course, Advances in Agronomy, quantity forty seven makes a speciality of environmental caliber and biotechnology. 4 articles on soil technological know-how hide acid deposition, chemical shipping, and floor complexation. articles on crop technological know-how survey style fingerprinting and corn evolution. This and similar volumes could be of curiosity to agronomists and biotechnologists in academe, undefined, and executive. Key good points* Acidic deposition in forested soils* Modeling natural and inorganic chemical shipping in soils* floor complexation versions in soil chemical structures* Fingerprinting crop kinds* Evolution of corn
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Extra resources for Advances in Agronomy, Vol. 47
This relatively rapid recovery in a previously acidified watershed by effectively lowering the ionic strength of the soil solution supports the hypothesis that cation exchange processes control the concentration of ions in soil solution at the two RAIN project sites (Wright, 1988). 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).
Increases in soil temperature, soil pH, and/or soil moisture content will also result in an increase in mineralization and a release of NO: and H' to the soil solution (Swank, 1986). , 1991b). In acid soils that lie within the cation exchange and A1 buffering range, the seasonal acidification pushes can result in a marked increase in soil solution A1 and other base cations. , 1991b). , 1988; Lawrence and Driscoll, 1988). The decrease in vegetative N uptake combined with the increase in mineralization and nitrification results in a significant elevation in the concentration of NO; and cations in the soil solution.
1985) when plotted on activity ratio diagrams as a function of pH. Chemical models designed to predict changes in the activity of A13+ in soil solution due to acidic inputs often assume that gibbsite is the controlling phase for the activity of A13+ (Reuss and Johnson, 1986; Schecher and Driscoll, 1989). 0. 2 range. 66 for the coefficient of pH in Eq. , 1990). These results suggest that a separate solid phase is not controlling the activity of A13+ in soil solutions, at least in the upper surface horizons (Bloom and Grigal, 1985).
Advances in Agronomy, Vol. 47 by Donald L. Sparks