Denitrification on Andosols in an intensive dairy farming region of central Japan |
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Authors: | Meihua DengSonoko D Kimura Juhwan LeeMasayuki Hojito Muneoki Yoh |
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Institution: | a United Graduate School of Agriculture Science, Tokyo University of Agriculture and Technology, Fuchu 183-8509, Japan b Department of Plant Science, University of California, One Shields Avenue, Davis, CA 95616, USA c Field Science Center, Kitasato University, Nasushiobara 329-2793, Japan |
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Abstract: | Evaluation of denitrification capacities is necessary to develop a sustainable manure management system in order to reduce NO3− leaching and N2O emissions from agricultural soils. Denitrification rates were measured using the acetylene inhibition technique on intact soil cores from eight Andosols under three different cropping systems in an intensive livestock catchment of central Japan. The N application rates ranged from 200 to 800 kg N ha−1 yr−1. The denitrification rates were highly variable across fields, and were influenced significantly by land uses and manure forms. Compared with upland fields, paddy rice fields had a greater denitrification rate up to 1380 and 85 mg N m−2 day−1 in the top 30-cm soil layer during flooding and non-flooding periods, respectively. In upland fields, the maximum value for the top 30-cm soils was 44 mg N m−2 day−1 and most of the rates were less than 10 mg N m−2 day−1. The greater denitrification rates were often associated with slurry application rather than composted dry manure. Overall, denitrification from Andosols in this study displayed a lower capacity than that of non-Andosols. |
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Keywords: | Andosols Denitrification Intensive manure application Italian ryegrass Maize Paddy rice |
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