Res. Agr. Eng., 2008, 54(2):58-67 | DOI: 10.17221/1001-RAE
Nitrogen conversion and nitrous oxide hot spots in energy crop cultivation
- 1 Department of Technology-Assessment and Substance Cycles, Leibniz-Institute for Agricultural Engineering Potsdam-Bornim (ATB), Potsdam, Germany
- 2 Department of Post Harvest Technology, Leibniz-Institute for Agricultural Engineering Potsdam-Bornim (ATB), Potsdam, Germany
- 3 Department of Bioengineering, Leibniz-Institute for Agricultural Engineering Potsdam-Bornim (ATB), Potsdam, Germany
Since 1999, nitrous oxide (N2O) soil emissions from sites cultivated with energy plants have been measured by gas chromatography and gas flux chambers in experimental fields. The main aim of this study was the nitrogen conversion factor and its variability for sandy soils under climatic conditions of Central Europe. Annual plants (hemp, rape, rye, sorghum, triticale) and perennial plants (grass, perennial rye, poplar, willow) were fertilised with three different levels of nitrogen (150 kg N/ha/year, 75 kg N/ha/year, and none). The annual nitrogen conversion factors were derived from the annual mean differences between the fertilised sites and non-fertilised control sites. The mean nitrogen conversion factor for the non-cultivated soils was lower (perennial crops: 0.4%) than that for the regularly cultivated soils (annual crops: 0.9%). Few times, enhanced N2O emission spots with maxima above 1000 μ2O/m2/h, lasting for several weeks, were observed in the course of measurements. The influence of these local peak emissions on the nitrogen conversion factor is discussed.
Keywords: nitrogen fertilisation level; N2O soil flux; cultivated and non-cultivated soils; perennial and annual plants
Published: June 30, 2008 Show citation
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