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Effects of Continuous Straw Returning Combined with Reduced Fertilizer Application on Rice Yield and Loss of Nitrogen and Phosphorus
[Objective] The effects of straw returning combined with reduced chemical fertilizer application on rice yield and nitrogen and phosphorus losses with runoff were studied in order to provide a scientific basis for the recycling and reuse of local agricultural resources and the prevention and control of agricultural non-point source pollution. [Methods] A three-year (2018—2020) field plot experiment was conducted that included two treatments: conventional fertilization (T1), and straw returning + conventional fertilization reduced by 28.57% for nitrogen and 25.11% for phosphorous (T2). The concentrations and losses of nitrogen and phosphorus in farmland surface runoff, yield, nitrogen and phosphorus uptake by rice straw and grain, and soil nutrients at harvest were determined. [Results] As the number of straw returning years increased, T2 achieved a significant increase in yield. Compared with T1, the yield of T2 increased by 16.93% in 2020. Compared with T1, the loss of the total nitrogen and NO3--N for T2 increased by 6.25%~14.97% and 6.99%~15.03%, respectively. The loss of the soluble total nitrogen, the total phosphorus, and the soluble total phosphorus for T2 was 0.94%~6.03%, 4.66%~10.32%. and 5.77%~21.15%, respectively, lower than observed for T1. The interannual changes of total phosphorus, available phosphorus, nitrate nitrogen, and ammonium nitrogen in soil were significant (p<0.05). Compared with T1, T2 significantly reduced soil total phosphorus by 8.79% and available phosphorus by 30.56%. [Conclusion] Continuous straw returning combined with reduced chemical fertilizer application ensured the crop yield and reduced the input of chemical fertilizer and the loss of phosphorus in farmland runoff, but increased the risk of nitrogen runoff loss. Therefore, the continuous straw-returning system should be further optimized in actual agricultural production.
Effects of Continuous Straw Returning Combined with Reduced Fertilizer Application on Rice Yield and Loss of Nitrogen and Phosphorus
[Objective] The effects of straw returning combined with reduced chemical fertilizer application on rice yield and nitrogen and phosphorus losses with runoff were studied in order to provide a scientific basis for the recycling and reuse of local agricultural resources and the prevention and control of agricultural non-point source pollution. [Methods] A three-year (2018—2020) field plot experiment was conducted that included two treatments: conventional fertilization (T1), and straw returning + conventional fertilization reduced by 28.57% for nitrogen and 25.11% for phosphorous (T2). The concentrations and losses of nitrogen and phosphorus in farmland surface runoff, yield, nitrogen and phosphorus uptake by rice straw and grain, and soil nutrients at harvest were determined. [Results] As the number of straw returning years increased, T2 achieved a significant increase in yield. Compared with T1, the yield of T2 increased by 16.93% in 2020. Compared with T1, the loss of the total nitrogen and NO3--N for T2 increased by 6.25%~14.97% and 6.99%~15.03%, respectively. The loss of the soluble total nitrogen, the total phosphorus, and the soluble total phosphorus for T2 was 0.94%~6.03%, 4.66%~10.32%. and 5.77%~21.15%, respectively, lower than observed for T1. The interannual changes of total phosphorus, available phosphorus, nitrate nitrogen, and ammonium nitrogen in soil were significant (p<0.05). Compared with T1, T2 significantly reduced soil total phosphorus by 8.79% and available phosphorus by 30.56%. [Conclusion] Continuous straw returning combined with reduced chemical fertilizer application ensured the crop yield and reduced the input of chemical fertilizer and the loss of phosphorus in farmland runoff, but increased the risk of nitrogen runoff loss. Therefore, the continuous straw-returning system should be further optimized in actual agricultural production.
Effects of Continuous Straw Returning Combined with Reduced Fertilizer Application on Rice Yield and Loss of Nitrogen and Phosphorus
Yao Li (author) / Wang Hong (author) / Zhang Qi (author) / Liu Haitao (author) / Luo Fuxiang (author) / Wang Xie (author) / Zheng Shenghua (author) / Liang Fan (author) / Lin Chaowen (author)
2022
Article (Journal)
Electronic Resource
Unknown
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No-Tillage Combined with Appropriate Amount of Straw Returning Increased Soil Biochemical Properties
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