| Cite this article: | 吴 汉,吴 含,钱 娜,等.间歇灌溉下直播水稻与移栽水稻的产量及水分利用差异[J].灌溉排水学报,2022,():-. |
| Wu Han,Wu Han,Qian Na,et al.间歇灌溉下直播水稻与移栽水稻的产量及水分利用差异[J].灌溉排水学报,2022,():-. |
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| Effects of Different Cropping Methods on Rice Yield and Water Use under Intermittent Irrigation |
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Wu Han1, Wu Han1, Qian Na1, Ke Jian2
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1.Irrigation Experiment Central Station of Pishihang Irrigation District of Anhui Province,General Administration of Pishihang Irrigation District of Anhui Province,Lu’an;2.College of Agronomy,Anhui Agricultural University
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| Abstract: |
| To study the differences in yield and water use of transplanted rice and direct-seeded rice under intermittent irrigation, and to provide a basis for improving water resources scheduling in irrigation districts. A experiment was performed to investigate the effects of two rice cultivation methods (puddled transplanted rice(PTR) and direct-seeding rice(DSR)) on rice yield and water use under intermittent irrigation(II) in 2018 and 2019, traditional flooding irrigation(FI) were established as control. The experimental results showed that the yield of direct-seeded rice under intermittent irrigation (II + DSR) was 10.48 - 12.25 t.hm-2, which was not significantly different from that of direct-seeded rice under traditional flooding irrigation(FI + DSR), but decreased significantly than puddled transplanted rice (FI + PTR, II + PTR). Compared with PTR, the effective panicles of direct-seeded rice increased, while the number of panicles, seed setting rate and thousand-grain weight decreased significantly. Compared with traditional flood irrigation, intermittent irrigation significantly reduced water demand by 8.07 - 10.12 %. The water requirement of II + DSR is 555.8 - 628.9 mm, which is 40.1 - 53.8 mm more than that of II + PTR, and decreased by 8.7 -17.0 mm compared with FI + PTR. The increase in evapotranspiration (ET) of direct seeding rice was mainly due to the increase in ET at seedling stage, while the ET at tillering stage was not significantly different from that of transplanted rice, and the ET after panicle differentiation decreased significantly. The water productivity of intermittent irrigation is significantly higher than that of traditional flood irrigation. In addition, compared with II + PTR, the water productivity of II + DSR decreased significantly by 12.71 - 24.69 %. However, there is no obvious pattern of irrigation water use efficiency in different years. This study believes that under intermittent irrigation, direct seedling rice significantly increases water demand compared to transplanted rice, mainly due to increased water demand at seedling stage and reduced water demand after ear differentiation, which results in the number of spikelets, seed set rate, Thousand kernel weight decreased significantly, thereby reducing yield and water productivity significantly. |
| Key words: Intermittent Irrigation; Direct Seeding; Transplanting; Evapotranspiration |
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