NH3 Volatilization,N2O Emission and Microbial Biomass Turnover from 15N-Labeled Manure Under Laboratory Conditions |
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| Authors: | Mariko Ingold Gunadhish Khanal Jens Dyckmans Christine Wachendorf Andreas Buerkert |
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| Affiliation: | 1. Organic Plant Production and Agroecosystems Research in the Tropics and Subtropics, Universit?t Kassel, Witzenhausen, Germanyingold@uni-kassel.de;3. Organic Plant Production and Agroecosystems Research in the Tropics and Subtropics, Universit?t Kassel, Witzenhausen, Germany;4. Centre for Stable Isotope Research and Analysis, Georg-August-Universit?t G?ttingen Büsgen-Institute, G?ttingen, Germany;5. Soil Biology and Plant Nutrition, Universit?t Kassel, Witzenhausen, Germany |
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| Abstract: | On irrigated agricultural soils from semi-arid and arid regions, ammonia (NH3) volatilization and nitrous oxide (N2O) emission can be a considerable source of N losses. This study was designed to test the capture of 15N loss as NH3 and N2O from previous and recent manure application using a sandy, calcareous soil from Oman amended one or two times with 15N labeled manure to elucidate microbial turnover processes under laboratory conditions. The system allowed to detect 15N enrichments in evolved N2O-N and NH3-N of up to 17% and 9%, respectively, and total N, K2SO4 extractable N and microbial N pools from previous and recent 15N labeled manure applications of up to 7%, 8%, and 15%. One time manured soil had higher cumulative N2O-N emissions (141 µg kg?1) than repeatedly manured soil with 43 µg kg?1 of which only 22% derived from recent manure application indicating a priming effect. |
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| Keywords: | 15N-labeled manure ammonia trap microbial biomass N2O oasis agriculture |
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