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| Agronomic and environmental effects of P fertilization reduction in rice-wheat rotation field in Taihu Lake Region of Southeast China |
| Received:November 06, 2015 |
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| KeyWord:phosphorus fertilization for wheat only;crop yield;phosphorus utilization efficiency;soil Olsen-P;runoff TP;economic benefits |
| Author Name | Affiliation | E-mail | | ZHU Wen-bin | School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China
State Key Laboratory of Soil and Sustainable Agriculture, Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | WANG Yu | State Key Laboratory of Soil and Sustainable Agriculture, Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | WANG Shen-qiang | State Key Laboratory of Soil and Sustainable Agriculture, Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | sqwang@issas.ac.cn | | ZHAO Xu | State Key Laboratory of Soil and Sustainable Agriculture, Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | LU Ya-nan | State Key Laboratory of Soil and Sustainable Agriculture, Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
College of Science, Nanjing Agricultural University, Nanjing 210095, China | | | CHENG Yi | State Key Laboratory of Soil and Sustainable Agriculture, Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | SI You-bin | School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | youbinsi@ahau.edu.cn |
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| Abstract: |
| Over-fertilization of phosphorus(P) fertilizers is a common practice in rice-wheat rotation fields in the Taihu Lake Region(TLR). In this study, a four-year field experiment of eight rice-wheat-growing seasons was conducted to explore the feasibility of omitting P application in rice season. Four different P regimes, including P fertilization for wheat season only(PW), P fertilization for rice season only(PR), P fertilization for both rice and wheat seasons(PR+W), and no P fertilization for both seasons(Pzero) as control, were designed. Compared with PR+W treatment, rice and wheat yields over 4 years did not show significant difference in PW treatment; but the concentrations of Olsen-P and total P in PW treatment declined by 10.5%~36.7% and 12.0%, respectively(P < 0.05), and the utilization efficiency of P fertilizer increased by 3.54%(P < 0.05). Based on the current price of superphosphate, 3.06 billion RMB per year could be saved in TLR. Therefore, the regime of omitting P fertilizer for rice season in rice-wheat rotation field has positive effects on agriculture, environment and economy, and is feasible for at least 4 years in TLR. |
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