Effects of a new nitrification inhibitor 3,4-dimethylpyrazole phosphate(DMPP) on nitrate and potassium leaching in two soils
WU Shao-fu , WU Liang-huan , SHI Qi-wei , WANG Zhong-qiang , CHEN Xian-you , LI Yong-shan
DOI:
Received August 22, 2006,Revised December 06, 2006, Accepted , Available online
Volume 19,2007,Pages 841-847
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In this study, soil column was used to study the new nitrification inhibitor 3,4-dimethylpyrazole phosphate (DMPP) on nitrate (NO3??-
N) and potassium (K) leaching in the sandy loam soil and clay loam soil. The results showed that DMPP with ammonium sulphate
nitrate (ASN) ((NH4)2SO4 and NH4NO3) or urea could reduce NO3??-N leaching significantly, whereas ammonium (NH4
+-N) leaching
increased slightly. In case of total N (NO3??-N+NH4
+-N), losses by leaching during the experimental period (40 d) were 37.93 mg
(urea), 31.61 mg (urea+DMPP), 108.10 mg (ASN), 60.70 mg (ASN+DMPP) in the sandy loam soil, and 30.54 mg (urea), 21.05
mg (urea+DMPP), 37.86 mg (ASN), 31.09 mg (ASN+DMPP) in the clay loam soil, respectively. DMPP-amended soil led to the
maintenance of relatively high levels of NH4
+-N and low levels of NO3??-N in soil, and nitrification was slower. DMPP supplementation
also resulted in less potassium leached, but the di erence was not significant except the treatment of ASN and ASN+DMPP in the sandy
loam soil. Above results indicate that DMPP is a good nitrification inhibitor, the e ciency of DMPP seems better in the sandy loam
soil than in the clay loam soil and lasts longer.
