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| Effects of long-term application of inorganic phosphate fertilizer to soil phosphorus pools in yellow-mud soil paddy fields |
| Received:February 17, 2022 |
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| KeyWord:long-term phosphorus application;paddy field;phosphorus forms;phosphorus availability |
| Author Name | Affiliation | E-mail | | XU Chen | School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang 212001, China
Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | SHEN Susu | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
College of Resources and Environmental Science, Nanjing Agricultural University, Nanjing 210095, China | | | HE Zhu | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | WANG Ning | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | ZHOU Beibei | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
School of Environmental Ecology, Jiangsu Open University, Nanjing 210017, China | | | SHEN Mingxing | Suzhou Academy of Agricultural Sciences, Suzhou 215155, China | | | SHI Linlin | Suzhou Academy of Agricultural Sciences, Suzhou 215155, China | | | XUE Lihong | School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang 212001, China
Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
College of Resources and Environmental Science, Nanjing Agricultural University, Nanjing 210095, China | njxuelihong@gmail.com |
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| Abstract: |
| In this study, a long-term positioning field in the Taihu Lake basin was selected to study the effects of long-term chemical phosphorus（P）fertilizer application on soil P content, form, and availability（yellow-mud soil）. The results showed that the soil total P and available P contents in NPK treatment were as high as 589.58 mg·kg-1 and 51.67 mg·kg-1, which were significantly increased by 126.61% and 216.41% over the no P（NK）treatment. The inorganic P in the two treatments was mainly Fe-P and Ca-P, which accounted for approximately 69.53% – 79.86% of inorganic P. Organic P was mainly active and medium active organic P. Long-term P application significantly increased the inorganic P content by more than 170% in the three growth stages of the yellow-mud soil field in comparison with the NK treatment. The content and relative proportion of Al-P and Fe-P increased significantly, the Ca-P content increased while the relative proportion was significantly reduced. In addition, the O-P content remained stable, but the relative proportion decreased. Organic P content, especially active and moderately active organic P content, increased significantly only at the tillering stage（33%）. Compared with the tillering stage, the relative proportions of Al-P, Fe-P, and highly stable organic P in the NPK treatment decreased, while the Fe-P, O-P, and highly stable organic P in the NK treatment decreased at the heading stage, while Ca-P and medium active organic P increased. Al-P, Fe-P, Ca-P, O-P, and moderately active organic P in yellow-mud soil were significantly positively correlated with available P（AP）. The results indicated that Al-P, Fe-P, and Ca-P were the main effective P sources in yellow-mud soil paddy fields, and the activation of organic P by soil phosphatase was an important source of available P when the soil is short of P. Long-term application of inorganic P fertilizer resulted in the obvious accumulation of inorganic P pools in paddy soil and increased the risk of P loss. Therefore, the amount of P fertilizer should be reasonably reduced through organic P substitution to promote the activation of soil insoluble P to ensure a high yield of rice and wheat and reduce the risk of P loss. |
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