Get Advances in Agronomy, Vol. 110 PDF

By Donald L. Sparks

ISBN-10: 0123855314

ISBN-13: 9780123855312

Advances in Agronomy is still famous as a number one reference and a major resource for the newest learn in agronomy. As continually, the themes lined are diverse and exemplary of the myriad of subject material handled via this long-running serial. * keeps the top impression issue between serial guides in agriculture * offers well timed studies on very important agronomy concerns * Enjoys a long-standing popularity for excellence within the box

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The free radical concentration in FAs was also shown to be directly related to their color, degree of aromaticity, and molecular size and complexity. 3. Elemental composition The elemental composition of DOM depends on its origin (Table 4). The major elements accompanying carbon include oxygen, hydrogen, nitrogen, phosphorus, sulfur, and trace amounts of various cations including calcium, potassium, magnesium, and metal(loid)s including aluminum, iron, zinc, and copper. For example, Kaiser (2001) found that the organic forest floor layers were large sources for DOC, DON, DOP, and DOS.

Oxides, hydroxides, and oxyhydroxides of Al and Fe) that provide the majority of surface area for the sorption of DOM and other solutes in soil. Organic–mineral interactions range in strength from strong ligand exchange to weaker anion-exchange reactions (McBride, 1994). The bonding mechanisms of DOM onto the soil solid phase have already been elucidated by Gu et al. (1994) and Sollins et al. (1996). This includes bonding of negatively charged organics by ligand exchange especially in oxide-rich and allophanic soils, positively charged organics into negative surfaces by cation exchange, anion exchange onto subsoils and variably charged soils, and the less important mechanisms such as cation bridging, water bridging, hydrogen bonding, and van der Waals forces.

The molecular size, aromatic character, and polycondensation degree of DOM decreased with soil depth, whereas aliphaticity increased. These results suggest that the aromatic portion of partially degraded lignin-derived compounds might be gradually adsorbed by mineral soil components and protected from microbial degradation. 2. Cultivation Cultivation influences DOM in soils by providing oxygen, thereby accelerating the decomposition of organic matter releasing DOM and subsequent degradation and leaching of the released DOM (Bueno and Ladha, 2009).

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Advances in Agronomy, Vol. 110 by Donald L. Sparks

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