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| DOI：10.13522/j.cnki.ggps.2019409 |
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| The Combined Effects of Water and Fertilizer Applications on Root Uptake of N and P and Yield of Rice |
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HE Jun, HE Tiankai, ZHANG Yuhang, ZHONG Shengjian, GAO Mingli,ZHAO Shujun, CHEN Yang, ZHU Zirong, CHEN Ying
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1.College of Hydraulic and Environmental Engineering, China Three Gorges University, Yichang 443002, China;2.Engineering Research Center of Ecoenvironment in Three Gorges Reservoir Region, Ministry of Education, China Three Gorges University, Yichang 443002, China; 3. Hubei Zhanghe Hydraulic Project Administration Bureau, Jingmen 448156, China
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| Abstract: |
| 【Background】Rice is a staple crop but its fertilizer use efficiency in China is low. Improving water and nitrogen use efficiency of rice is hence essential to meet the mandatory requirement of zero increase in agrochemicals application while in the meantime maintaining sustainable crop production in China.【Objective】This paper aims to investigate how to improve root uptake of nitrogen and phosphorus through optimization of irrigation and fertilization.【Method】The experiment was conducted in lysimeters with conventional flood irrigation (W1) and alternate wet and dry irrigation, with each having two fertilizations-conventional fertilization (N1) and slow-release fertilization (N2).【Result】Slow-release fertilization in combination with W1 and W2 increased the nitrogen harvest index (NHI) to 69.0% and 71.6% respectively, up 2.8% and 7.5%; and phosphorus harvest index to 84.1% and 86.7% respectively, up 0.5% and 4.4%, compared to the conventional fertilization. The partial productivity of slow-release nitrogen and phosphorus was 58.4 kg/kg and 145.9 kg/kg, respectively, in W2, up 1.2% and 1.1% compared to W1. Coupling N2 and W2 maximized the yield to 10 505 kg/hm2, increasing by 1.1% compared to combination of N2 and W1.【Conclusion】Coupling slow-release fertilization with alternate wet and dry irrigation improved both fertilizer utilization and yield of the rice at significant level. |
| Key words: water and fertilizer application; total nitrogen; total phosphorus; yield |
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