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| Reduced P fertilization for rice/wheat rotation in Taihu Lake region |
| Received:September 18, 2015 |
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| KeyWord:rice-wheat rotation;P fertilization for wheat only;crop yield;P utilization efficiency;Olsen-P |
| Author Name | Affiliation | E-mail | | LU Ya-nan | Nanjing Agricultural University College of Science, Nanjing 210095, China
Institute of Soil Science, Chinese Academy of Sciences, State Key Laboratory of Soil and Sustainable Agriculture, Nanjing 210008, China | | | WANG Yu | Institute of Soil Science, Chinese Academy of Sciences, State Key Laboratory of Soil and Sustainable Agriculture, Nanjing 210008, China | | | WANG Shen-qiang | Institute of Soil Science, Chinese Academy of Sciences, State Key Laboratory of Soil and Sustainable Agriculture, Nanjing 210008, China | sqwang@issas.ac.cn | | ZHU Wen-bin | Institute of Soil Science, Chinese Academy of Sciences, State Key Laboratory of Soil and Sustainable Agriculture, Nanjing 210008, China
Anhui Agricultural University School of Resources and Environment, Hefei 230036, China | | | ZHAO Xu | Institute of Soil Science, Chinese Academy of Sciences, State Key Laboratory of Soil and Sustainable Agriculture, Nanjing 210008, China | | | CHENG Yi | Institute of Soil Science, Chinese Academy of Sciences, State Key Laboratory of Soil and Sustainable Agriculture, Nanjing 210008, China | | | LI Guo-hua | Nanjing Agricultural University College of Science, Nanjing 210095, China | liguohua@njau.edu.cn |
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| Abstract: |
| High inputs of P fertilizers to soils have caused P pollution in waters, especially in intensive farming areas. A pot experiment was carried out to explore the feasibility of omitting or reducing phosphorus(P) fertilizers for rice in rice/wheat rotation using paddy soils with three different Olsen-P levels(P-rich, P-medium, and P-deficient) soils from Taihu Lake region. Four P treatments, including P fertilization for wheat only(PW), P fertilization for rice only(PR), P fertilization for both rice and wheat(PR+W), and no P for rice or wheat(Pzero), were used. Compared with PR+W treatment, crop yields in PW had no significant difference in P-rich, P-medium and P-deficient soils, while P utilization efficiency was increased by 4.21%, 17.3% and 18.5%, respectively, but the concentration of Olsen-P in soils decreased by 20%~60%. However, PR treatment significantly reduced crop yields in P-deficient soil(P<0.05). Hence, P fertilization for wheat only(PW) in rice/wheat rotation is feasible while maintaining rice yield. |
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