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| DOI：10.13522/j.cnki.ggps.2022242 |
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| The Combined Effect of Irrigation and Nitrogen Fertilization on Dry Matter and Yield of Rice |
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PAN Chen, YANG Yu, QI Dongliang
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College of Agriculture, Yangtze University, Jingzhou 434025, China
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| Abstract: |
| 【Objective】Nitrogen uptake and its translocation in crops is modulated by soil water. In this paper, we studied the combined impact of different irrigations and fertilizations on dry matter accumulation and yield of rice.【Method】The experiment was carried out in the field, with the variety Liangyou 152 used as the model plant. The experiments consisted of two irrigation methods: conventional irrigation (CF) and alternating wet and dry irrigation (AWD). For reach irrigation method, there were three nitrogen applications: 240 kg/hm2 of traditional urea (N1), 144 kg/hm2 controlled-release urea + 96 kg/hm2 traditional urea (N2), and 240 kg/hm2 controlled-release urea (N3). For each treatment, we measured the change in SPAD in the leaves, plant height and the total numbers of heads, dry matter accumulation in each organ at the panicle extraction and maturity stages, as well as grain yield and its formation.【Result】When nitrogen application was the same, AWD increased SPAD, crop growth, tillering panicle formation rate, dry matter accumulation and distribution ratio of rice leaves from jointing to filling stages. When irrigation was the same, compared to N1, N2 and N3 increased the stem tillering panicle formation rate, crop growth rate, dry matter accumulation, the numbers of grains per panicle, 1 000-grain weight, fruiting rate and grain yield; the yield of N2 was higher than that of N3. Overall, AWD+N2 increased SPAD, stem tiller panicle rate, crop growth rate, dry matter accumulation, harvest index, panicle number, 1 000-grain weight, seed setting rate, and grain yield of rice, compared with other treatments.【Conclusion】Alternating wet and dry irrigation combined with fertilization of 144 kg/hm2 controlled-release urea + 96 kg/hm2 traditional urea is most effective to reduce ineffective tillering, improve nitrogen in the crop, and promote dry matter accumulation and its translocation to rice grains. |
| Key words: rice; alternate wetting and drying irrigation; controlled-release urea; harvest index; dry matter |
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