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| Effects of Different NBPT/DCD Combinations on Ammonia Volatilization and Available-N in Alkaline Anthropogenic-alluvial Soil in Irrigated Area |
| Received:October 27, 2014 |
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| KeyWord:alkaline anthropogenic-alluvial soil;NBPT;DCD;ammonia volatilization loss;NO3--N accumulation;NH4+-N accumulation |
| Author Name | Affiliation | E-mail | | ZHANG Hui | Ningxia Polytechnic, Ningxia Radio & TV University, Yinchuan 750021, China | | | WANG Zhi-guo | Ningxia Polytechnic, Ningxia Radio & TV University, Yinchuan 750021, China | | | ZHANG Qing-wen | Agricultural Clean Watershed Research Group, Institute of Environmentand Sustainable Developmentin Agriculture, CAAS, Beijing 100081, China | ellenzhqw@163.com | | DING Jin-ying | Ningxia Polytechnic, Ningxia Radio & TV University, Yinchuan 750021, China | | | YIN Ai-jun | Ningxia Polytechnic, Ningxia Radio & TV University, Yinchuan 750021, China | | | ZUO Ying | Ningxia Polytechnic, Ningxia Radio & TV University, Yinchuan 750021, China | |
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| Abstract: |
| Urease inhibitor, N-(n-butyl)thiophosphorictriamide(NBPT), has potential to reduce urea nitrogen losses via ammonia volatilization(AV), while nitrification inhibitor, dicyandiamide(DCD), could reduce nitrogen loss through leaching, both increasing available-N in soils. A laboratory experiment was conducted to study AV loss and ammonium-N(NH4+-N) and nitrate-N(NO3--N) accumulations in alkaline anthropogenic-alluvial soil under different ratios of two inhibitors(NBPT/DCD). Six different rate combinations of NBPT/DCD and CK(without inhibitor) were employed. Results showed that AV rates and NH4+-N accumulation were relatively high in the first a few days after fertilizer application, compared with CK. Addition of NBPT alone at 0.1% reduced AV by 64%. Soil NO3--N and NH4+-N accumulations were significantly lower in NBPT treatments than CK during 5 days after urea application. However, such inhibiting effect of NBPT lasted only about 8 days. Combined applications of NBPT and DCD significantly reduced AV loss and NH4+-N accumulation in soil while increased NO3--N accumulation in soil. Compared with CK, applying 0.1% NBPT and 1% DCD reduced AV loss by 16.7%, and NH4+-N accumulation in soil slowed down while NO3--N accumulation in soil increased after 5 days of fertilization. At 0.1% NBPT, increasing DCD from 2% to 5% decreased soil NO3--N concentrations while gradually increased soil NH3 volatilization. These findings suggest that optimized combined application of inhibitors would be 2%~3% DCD and 0.1%NBPT for reducing nitrogen loss via AV and maintaining higher available-N in alkaline anthropogenic-alluvial soil in irrigated area. |
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