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| The effect of phosphorus-reduction on soil phosphorus supply and wheat phosphorus uptake in a rice-wheat rotation system in the Taihu Lake Region |
| Received:September 29, 2017 |
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| KeyWord:Taihu Lake farmland;phosphorus fertilizer reduction;grain yield;crop total P;soil Olsen P;DGT-Labile P |
| Author Name | Affiliation | E-mail | | CHEN Hao | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China | | | WANG Yu | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | YUAN Jia-hui | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
Northeast Agricultural University, Harbin 150030, China | | | ZHU Wen-bin | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | WANG Shen-qiang | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | sqwang@issas.ac.cn |
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| Abstract: |
| A field experiment was performed to investigate the effect of P reduction on soil P supply and wheat P uptake in a rice-wheat rotation system in Taihu Lake Region by analyzing the soil Olsen P, DGT-Labile P, grain yield, and P uptake of wheat. Four fertilization regimes, including P fertilization during both the rice-and wheat-growing seasons(PR+W, current farming practice, and control); P fertilization only during the rice-growing season(PR); P fertilization only during the wheat-growing season(PW); and no P fertilization during either season(Pzero) were designed. Compared with the PR+W regime, the PW treatment did not decrease soil Olsen P, wheat grain yield, or crop total P. In contrast, the PR treatment significantly(P<0.05) reduced the soil Olsen P, grain yield of wheat, and the aboveground crop total P by 44.8%, 32.8%, and 27.9%, respectively. Significant positive correlation was observed between the DGT-Labile P and soil Olsen P(P<0.05, R2=0.42), both of which had a significant positive correlation with the grain yield of wheat and crop total P. In the wheat season, a P regime with P fertilization not only ensures adequate soil P supply and wheat P uptake, but also maintained the grain yield of wheat. In contrast, a P regime without P fertilization significantly reduced the soil Olsen P, P uptake, and grain yield of wheat. DGT-Labile P could assess the relationship between soil P supply and wheat P uptake in rice-wheat rotation systems in the Taihu Lake Region. |
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