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| DOI： |
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| Types of Fertilizers and Their Application Affect the Leaching of Nitrogen and Phosphorus in Paddy Fields in Irrigation Districts of Yellow River |
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LIU Ruliang， WANG Fang, ZHANG Aiping, LI Youhong, CHEN Chen, HONG Yu,YANG Zhengli
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Institute of Agricultural Resources and Environment, Ningxia Academy of Agro-forestry Science, Yinchuan 750002, China; Agricultural Clean Watershed Innovation Team, Key Laboratory of Agriculture Environment and Climate Change, Ministry of Agriculture, China Institute of Environment and Sustainable Development in Agriculture,
China Academy of Agricultural Science, Beijing 100081, China
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| Abstract: |
| Experiments were conducted in this paper aimed to reduce the leaching of contaminants from the paddy fields in Yellow River Irrigation Districts under different fertilizations after the water receded. The results showed that compared with conventional fertilization, optimized fertilization and fertigation on “side-strip” could significantly reduce TN concentrations in the surface and receding water. Under the side-strip fertilization, the TN concentrations in the surface and the receding water were only 47.4% and 34.3% of those under conventional fertilization. There was no significant difference in TP concentration in the surface water and receding water between all treatments. The optimized fertilization and side-strip fertilization did not considerably reduce the rice yield after reducing the fertilizer application. Organic farming reduced the yield by 26.5% compared with the conventional treatment. Considering yield and impact on environment, the optimized fertilization and side-strip fertilization are environmental friendly in the Yellow River Irrigation areas. |
| Key words: Yellow River irrigation area; optimization fertilization; side-strip fertilization technology; nitrogen and phosphorus loss |
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