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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 keeps its lengthy culture and expands to incorporate leading edge tools and applied sciences. prime overseas scientists hide themes in plant and soil sciences, biotechnology, terrestrial ecosystems, and environmental concerns.The moment quantity lower than new editorial path, Advances in Agronomy, quantity forty seven makes a speciality of environmental caliber and biotechnology. 4 articles on soil technology disguise acid deposition, chemical delivery, 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 beneficial properties* Acidic deposition in forested soils* Modeling natural and inorganic chemical delivery in soils* floor complexation versions in soil chemical structures* Fingerprinting crop types* Evolution of corn

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Extra resources for Advances in Agronomy, Vol. 47

Example text

ROBARGE AND DALE W. JOHNSON (Matzner, 1989). Reduction of N uptake translates into enhanced leaching and potential transport of NO, and toxic cations to the stream-lake environment. Additional disruptions in nitrogen-unstable ecosystems, such as prolonged periods of drought or the loss of overhead canopy due to the forest decline, will only aggravate the loss of NO; from the ecosystem (Gundersen and Rasmussen, 1990). , 1989; Hauhs, 1989) due to the uncoupling of the deacidification processes of the bulk soil from the acidification processes of nitrification (Ulrich, 1986).

Rearrangement of Eq. ( 5 ) to illustrates how the activity of the A13+ ion in solution is a function of the nature of the exchange surface (&), the BS [CaX] or acid saturation [AlX] of the exchange surface, and ionic strength of the soil solution (Ca2+). The nonlinear dependence on the activity of A13+ in solution is particularly important in regard to the nature of the base cation. Soil solution A13+ concentration increases to the 3/2 power of soil solution Ca2+ or Mg2+ concentration, and to the third power for soil solution K + , Na+, or H+ (Reuss, 1983).

Therefore, relatively few studies are available that can be used to determine whether an increase in H+ loading increases the rate of silicate weathering. 6 kmol ha-' yr-' (Folster, 1985). 29 kmol ha-' yr-', respectively (Matzner, 1989). These rates are similar to those estimated for the Hubbard Brook Watershed for the past 24 years, suggesting that there has been no trend in weathering rates at this forested catchment that also receives substantial inputs of acidic deposition (Frogner, 1990). Lack of an increase in weathering rates is also the tentative conclusion of the RAIN project in Norway after 4 years of manipulation of four catchments (Frogner, 1990).

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