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

By Donald L. Sparks

Less than new editorial path, Advances in Agronomy either maintains its lengthy culture and expands to incorporate leading edge tools and applied sciences. prime overseas scientists conceal issues in plant and soil sciences, biotechnology, terrestrial ecosystems, and environmental concerns.The moment quantity below 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 govt. Key beneficial properties* Acidic deposition in forested soils* Modeling natural and inorganic chemical delivery in soils* floor complexation versions in soil chemical platforms* Fingerprinting crop types* Evolution of corn

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19), and similar reactions can be written for other primary silicate minerals and for different secondary mineral end products such as kaolinite. The overall net result is the neutralization of H + , the release of nutrients, and the formation of a new secondary mineral solid phase (Reuss and Walthall, 1989). Equation (19) demonstrates that an increase in the H+ concentration of the soil solution should result in an increase in the rate of dissolution of the silicate minerals in a forest soil.

Anderson (1989) has predicted that a reduction of 80-90% in current S deposition to forests in Scandinavia would prevent any future changes in soil base saturation due to acidic inputs. The resulting critical load with such a reduction in S deposition would be approximately 2-4 kg (S) ha-lyr-'. De Vries has proposed a critical load of below 10 kg (S) ha-' yr-' for Dutch forest ecosystems. , 1984) in the eastern United States, suggesting that a substantial reduction in S emissions is required if the continued S loading of forest ecosystems in the remainder of the eastern United States is to be stopped or significantly reduced.

The rapid incorporation of applied SO$- into soil organic matter suggests that large quantities of S may cycle through the organic fractions during the growing season. Stanko and Fitzgerald (1990) noted that ACID DEPOSITION ON FORESTED SOILS 35 33-44% of applied SO',- immobilized by incorporation into soil organic matter was mineralized within 24 hr. , 1986). , 1991b). The emphasis on SO:- retention by subsoils may have overall importance to the quality of groundwater leaving a watershed, but much less so for quickflow from the surface soil horizons or for the soil solution in the rooting zone.

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