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By Donald L. Sparks

Advances in Agronomy is still famous as a number one reference and a prime resource for the most recent examine in agronomy. As consistently, the themes coated are diversified and exemplary of the myriad of subject material handled by way of this long-running serial. quantity ninety six includes seven enhanced studies with 25 tables. * continues the top influence issue between serial courses in Agriculture * offers well timed reports on vital agronomy concerns * Enjoys a long-standing popularity for excellence within the box

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2001a). , 2002). The processes involved in CH4 production from photosynthates were elucidated by pulse labeling of rice plants, that is exposure of the plant leaves to a pulse of 13C- or 14C-labeled CO2. , 2002b, 2004b). 2% and 1–5% of the photosynthetically assimilated C, respectively. , 1999). These data indicate that small changes in the carbon flow of photosynthates might produce large differences in the production of CH4 from photosynthates. , 2002a, 2004a, 2006). , 2007). Repeated pulse labeling also allowed identification of the methanogens that incorporated labeled carbon in the rhizosphere.

4). A further reason is the fact that nitrate is reduced to gaseous nitrogen rather than ammonium, so that nitrate nitrogen is permanently lost from the ecosystem rather than recycled by oxidation in the rhizosphere. Insofar, nitrogen cycling is different from sulfur and iron cycling, where gaseous loss is small (sulfur lost as H2S or methylated S) or absent (in case of Fe). , urea) might have some suppressive effect on CH4 emission. , 2004). 5) or suppression of CH4 production. This suppression possibly functions via production of nitrate.

However, it is questionable whether these processes have relevance for CH4 production under field conditions. , 1999). , 2002). 6). 5. Effect of temperature Methane emission rates correlate with increasing temperature according to the Arrhenius equation. , 1999). The temperature effect on CH4 emission is complex, since temperature affects virtually any biogeochemical process, including CH4 production and CH4 oxidation. However, the soil CH4 production is affected not only in total but in any individual reaction involved.

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