Download PDF by Donald L. Sparks: Advances in Agronomy, Vol. 47

By Donald L. Sparks

ISBN-10: 0120007479

ISBN-13: 9780120007479

Below new editorial path, Advances in Agronomy either maintains its lengthy culture and expands to incorporate cutting edge tools and applied sciences. major foreign scientists disguise themes in plant and soil sciences, biotechnology, terrestrial ecosystems, and environmental concerns.The moment quantity below new editorial path, Advances in Agronomy, quantity forty seven specializes in environmental caliber and biotechnology. 4 articles on soil technological know-how hide acid deposition, chemical delivery, and floor complexation. articles on crop technological know-how survey kind fingerprinting and corn evolution. This and comparable volumes might be of curiosity to agronomists and biotechnologists in academe, undefined, and executive. Key positive factors* Acidic deposition in forested soils* Modeling natural and inorganic chemical shipping in soils* floor complexation types in soil chemical platforms* Fingerprinting crop types* Evolution of corn

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1986; Berdtn et a f . , 1988; Lawrence and Driscoll, 1988). , red alder (Alrnus rubra Bong)], there can be substantial releases of NO; with a significant decrease in soil solution pH (Van Miegroet and Cole, 1984). 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.

By the mid-l960s, there is a decrease in base saturation of the bole wood, which would suggest a decrease in base cation availability. A decrease in base cation availability does not require a decrease in the concentration of base cations in the soil solution. An increase in the A1 concentration in the soil solution will reduce the uptake of base cations, especially Ca2+, through competition for uptake sites in fine tree roots (Shortle and Smith, 1988). Such an increase in A1 concentration would be expected as the inputs of acidic deposition increased the ionic strength of the soil solution in already naturally acid soils.

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+)].

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Advances in Agronomy, Vol. 47 by Donald L. Sparks


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