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Changes in nitrogen isotopic compositions during composting of cattle feedlot manure: effects of bedding material type |
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| Authors: | Kim Young-Joo Choi Woo-Jung Lim Sang-Sun Kwak Jin-Hyeob Chang Scott X Kim Han-Yong Yoon Kwang-Sik Ro Hee-Myong |
| Institution: | aDepartment of Agricultural Engineering, Institute of Agriculture and Life Science, Gyeongsang National University, Jinju 660-701, Republic of Korea bDepartment of Biosystems and Agricultural Engineering, Institute of Agricultural Science and Technology, Chonnam National University, Gwangju 500-757, Republic of Korea cDepartment of Renewable Resources, 442 Earth Sciences Building, University of Alberta, Edmonton, Alberta, Canada T6G 2E3 dDepartment of Plant Science, Institute of Agricultural Science and Technology, Chonnam National University, Gwangju 500-757, Republic of Korea eDepartment of Agricultural Biotechnology, Research Institute for Agriculture and Life Sciences, Seoul National University, Seoul 151-921, Republic of Korea fEnvironmental-Friendly Agriculture Research Center, Chonnam National University, Gwangju 500-757, Republic of Korea |
| Abstract: | Temporal changes in delta(15)N of cattle feedlot manure during its composting with either rice hull (RHM) or sawdust (SDM) as bedding materials were investigated. Regardless of the bedding material used, the delta(15)N of total N in the manure increased sharply from +7.6 per thousand to +9.9 per thousand and from +11.4 per thousand to +14.3 per thousand, respectively, in RHM or SDM, within 10 days from the commencement of composting. Such increases could be attributed primarily to N loss via NH(3) volatilization and denitrification based on the very high delta(15)N values (greater than +20 per thousand) of NH(4)(+) and NO(3)(-) in the co-composted manure. The delta(15)N of total N in RHM was substantially lower (by more than 3 per thousand) than that in SDM, suggesting that the delta(15)N of the composted manure was affected not only by N loss but also by the type of bedding material used. Specifically, the higher N concentration in the rice hull than in the saw dust could lead to a greater (15)N isotope dilution. |
| Keywords: | Ammonia volatilization Denitrification Isotopic fractionation Rice hull Sawdust |
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