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

By Donald L. Sparks

Less than new editorial path, Advances in Agronomy either keeps its lengthy culture and expands to incorporate cutting edge equipment and applied sciences. prime overseas scientists hide issues in plant and soil sciences, biotechnology, terrestrial ecosystems, and environmental concerns.The moment quantity lower than new editorial course, 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 kind fingerprinting and corn evolution. This and similar volumes could be of curiosity to agronomists and biotechnologists in academe, undefined, and govt. Key gains* 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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The lack of an equivalent release of metal cations is thought due to the protonation of 18 WAYNE P. ROBARGE AND DALE W. JOHNSON amino groups contained within the soil organic matter (James and Riha, 1986). Electroneutrality is maintained by adsorption of the accompanying anion or by dissolution of soil organic matter (Krug and Isaacson, 1984; James and Riha, 1986). These observations reinforce the general conclusion that forest soil organic horizons do not behave as simple ion exchanges in response to acidic inputs.

The significance of Eq. (11) in terms of formulating chemical models lies in the fact that the formation and subsequent removal from solution of the polynuclear A1 cation provides the necessary relationship between H+ and A13+ ions, without the need for invoking the presence of a separate A1 solid phase, or separate exchange reactions between H', A13+,and Ca2+ (Reuss and Johnson, 1986; Reuss and Walthall, 1989), at least in soil mineral horizons that are relatively low in organic matter content.

1983; Reuss and Johnson, 1986; Swank, 1986; Binkley and Richter, 1987; De Vries and Breeuwsma, 1987; Gundersen and Rassmussen, 1990). a. , 1982; Swank, 1986; Agren and Bosatta, 1988). Nitrogen retention is high because most forest ecosystems have N as the element limiting 30 WAYNE P. ROBARGE AND DALE W. JOHNSON growth (Binkley and Richter, 1987; Johnson and Lindberg, 1989). Nitrate removal from soil solution, therefore, will occur during the growing season when the demand for N by the biological community exceeds N inputs by atmospheric deposition and release of N from mineralization of soil organic matter.

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