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By Donald L. Sparks

Advances in Agronomy remains to be well-known as a number one reference and a major resource for the most recent examine in agronomy. As continually, the topics coated are various and exemplary of the myriad of material handled through this long-running serial. * continues the top effect issue between serial guides in agriculture * offers well timed reports on very important agronomy concerns * Enjoys a long-standing popularity for excellence within the box

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The DOM decreased with soil depth and averaged 18% greater under a sorghum–wheat–soybean rotation than a continuous sorghum monoculture. Similarly, Shao et al. (2009) noticed that a paddy soil under conservation tillage had higher easily oxidizable organic carbon, DOM, POC, and microbial biomass carbon than traditional tillage. Linn and Doran (1984) noticed a decrease in DOM in cultivated soils compared with no-till and direct drilled plots. , 2006). The concentrations of DOM decreased with soil depth and at 90-cm soil depth ranged between 7 and 21 mg C LÀ 1 and between 16 and 63 mg C LÀ 1 in sandy loam and coarse sandy soils, respectively.

2. Mobilization and export of nutrients Dissolved organic matter influences the mobility and bioavailability of those nutrients that interact with organic matter and undergo biological transformation processes (Table 8). , mineralization/immobilization). 1. Distribution of Nutrients in Soils Nutrient elements occur in various fractions in soils that usually include (Shuman, 1991) a. , K in feldspar); b. , occluded P); c. , complexed Cu); d. , biomass N, P, and S); e. , adsorbed P and Zn); Table 8 Example of mean concentrations of dissolved organic C, N and P in relation to scale, land- use, management, and flow regime Scale Land use Treatment Reference Parfitt et al.

Immobilization is the reverse process in which the plant available nutrients are converted to plant unavailable organic compounds. While N cycling is controlled mainly by biotic-induced reactions, both abiotic and biotic soil processes control P and S dynamics. Abiotic processes include physicochemical reactions such as phosphate and sulfate sorption– desorption and precipitation–dissolution. , 2009). 3. DOM-Induced Mobilization of Nutrients By definition, DOM constitutes not only C but also nutrients.

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