Advances in Agronomy, Vol. 113 by Donald L. Sparks

By Donald L. Sparks

Advances in Agronomy remains to be well-known as a number one reference and a main resource for the newest study in agronomy. As regularly, the topics coated are diversified and exemplary of the myriad of subject material handled by means of this long-running serial. * continues the top effect issue between serial guides in agriculture * provides well timed experiences on very important agronomy matters * Enjoys a long-standing popularity for excellence within the box

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14). Following research initiated by Humphreys, who died unexpectedly in 2007, Wilkinson is continuing his legacy at “The Macquarie School,” investigating the importance of biological mixing of soils and its implications for pedogenesis. Box 4 The term “bioturbation” in pedology At the 19th World Congress of Soil Science in Brisbane, Australia (August 1À6, 2010), we learned that the term “bioturbation” was introduced to pedology by Winfried E. Blum and Robert Ganssen in 1972 in their publication about “Soil-forming processes of the Earth” for the journal Die Erde, at least to the German speaking “soil scientist” (Blum and Ganssen, 1972).

From this review, we have learned that in order to verify mechanistic models of soil formation, it is essential to quantify pedogenic processes with field data. ) Qualitative (empirical) Soil-forming factors S 5 f(s,c,o,r,p,a,n); S 5 f (time)cl,o,r,p. . Quantitative empirical Dokuchaev (1886), Shaw (1930), Jenny (1941) McBratney et al. (2003); Chronofunctions Soil-forming processes S 5 f(addition, removal, translocation, transformation) Qualitative Simonson (1959) Soil evolution along pathways S 5 f(Progressively, regressively) Qualitative Johnson and WatsonStegner (1987) S 5 f(o,w,t) Soil formation is modeled through quantifying processes of energy, that is, radiation, kinetic energy, and so on Soil formation is modeled via energy expenditure Thermodynamic aspects in soil-forming processes, that is, Gibbs free energy and entropy of soil minerals Qualitative Mechanistic Runge (1973) Regan (1977) QuantitativeÀempiricalÀ mechanistic QuantitativeÀempiricalÀ mechanistic Volobuyev (1974) Energy Soil energy model Soil energy model Soil energy model Soil energy model Volobuyev and Ponomarev (1977) Mass balance Soil weathering: Soil production function Soil weathering: The “hump” function SPR 5 P0 exp(2bh) verified with field data QuantitativeÀmechanistic Heimsath et al.

06474 Geology Wyoming Wyoming New Mexico New Mexico New Mexico Hawaii Mexico Mexico Papua Wyoming Colorado Alexander (1988) CA CH, BC, Canada CS, BC, Canada England France Idaho Luxemburg Maryland Minnesota Maryland Maryland N. Hamp. 1 (Continued ) Reference ID Cleaves (1993) Wash. WF, Wales WP, Wales ZJ, Zimbabwe ZR, Zimbabwe Baltimore, Maryland Pacific Northwest Guayana Shield, South America Rhodesia-Juliasdale Dethier (1986) Edmond et al.

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