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| Effects of Different water and fertilizer management on nitrogen and phosphorus losses in tropical paddy field |
| Received:December 31, 2024 |
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| KeyWord:paddy field;nitrogen and phosphorus loss;water and fertilizer management;runoff loss;leaching loss |
| Author Name | Affiliation | E-mail | | LIU Lihua | School of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China | | | LIU Shuoran | School of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China | | | WANG Guangshuai | Key Laboratory of Water-Saving Irrigation Engineering, Ministry of Agriculture and Rural Affairs, Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China | | | JU Xiaotang | School of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China | juxt@cau.edu.cn |
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| Abstract: |
| To investigate the effects of different water and fertilizer management practices on nitrogen and phosphorus loss in paddy fields in tropical regions, a field experiment was conducted in the river-irrigated rice fields of Longgun Town, Hainan Province. A two-factor full design was adopted, with two fertilization modes set：farmer accustomed fertilization（F1）and optimized fertilization（F2）, as well as two irrigation modes：shallow wet irrigation（W1）and flooded irrigation（W2）, totaling four treatments（F1W1, F1W2, F2W1, F2W2）to study the churn characteristics of nitrogen and phosphorus. The results show that both fertilization mode and irrigation mode have significant impacts on the runoff and leaching of nitrogen and phosphorus, and there is a significant interaction between them. Compared with farmer accustomed fertilization, the surface water nitrogen runoff loss and seepage leaching loss of optimized fertilization decreased by 46.09%- 51.09% and 57.74%-62.73% respectively, while the phosphorus runoff loss and seepage leaching loss decreased by 54.14%-54.86% and 23.10%- 43.23% respectively. Under the condition of optimized fertilization, the surface water nitrogen and phosphorus runoff losses of shallow wet irrigation decreased by 14.65% and 45.02% respectively compared with those of flooded irrigation. However, the nitrogen seepage leaching loss of shallow wet irrigation increased by 58.76% compared with that of flooded irrigation, and there was no significant difference in the phosphorus seepage leaching loss between shallow wet irrigation and flooded irrigation. Overall, the total nitrogen and phosphorus emissions under different water and fertilizer managements were F1W2>F1W1>F2W2>F2W1. It can be seen that the optimized fertilization combined with the shallow wet irrigation water and fertilizer management mode significantly reduces the total nitrogen and phosphorus emissions, effectively alleviating the contribution of nitrogen and phosphorus loss in paddy fields to agricultural non-point source pollution. |
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