| Cite this article: | 吴汉,柯健,何海兵,等.不同间歇时间灌溉对水稻产量及水分利用效率的影响[J].灌溉排水学报,0,():-. |
| WU Han,KE Jian,HE Haibing,et al.不同间歇时间灌溉对水稻产量及水分利用效率的影响[J].灌溉排水学报,0,():-. |
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| Effects of Different Intermittent Time Irrigation on Rice Yield and Water Use Efficiency |
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WU Han1, KE Jian2, HE Haibing2, SHI Guangyu1, Wu Liquan2
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1.Irrigation Experiment Central Station of Pishihang Irrigation District of Anhui Province,Luan ,China;2.College of Agronomy,Anhui Agricultural University
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| Abstract: |
| 【Objective】To study the water-saving irrigation mode that is easy to promote and suitable for high-yield water use in rice in the Jianghuai region. 【Method】In 2015 and 2016, two consecutive intermittent irrigation days were set in the fixed cement pit for W1 (supplemental irrigation with water layer 3-5d before panicle initiation and the water layer 1-3 days after panicle initiation). W2 (Supplemental irrigation with water layer 7-9d before panicle initiation and the water layer 3-5 days after panicle initiation), and the conventional flooding (W0) was used as a control to study the number of intermittent days of supplementary irrigation under intermittent irrigation conditions. Its effect on rice yield and water use efficiency. 【Results】The results showed that the yield under W0 treatment was 9.40 t hm-2-8.01 t hm-2, and there was no significant difference between W1 and W2. Compared with W0, the total water demand of W1 and W2 decreased by 3.64%-4.74% and 5.63%-8.72% respectively; the water requirement of W2 treatment was lower than that of W1 treatment; the different irrigation methods mainly affected panicle initiation and fruiting. The water demand of the period affects the total water demand. Compared with W0, the water demand during the W1 and W2 spike differentiation periods decreased by 0.66 %-10.72 % and 4.54 %-7.33 %, respectively, and the water requirement during the fruiting period decreased by 4.67 %. 18.47 %, 20.76 % - 25.95 %; and reached a significant level in 2016. Compared with conventional flood irrigation (W0), W1 and W2 treatments significantly reduced irrigation volume by 7.50 % - 41.85 % and 31.00 % - 43.94 %, respectively, and reduced irrigation by 1,1-2 times. The irrigation efficiency of two years was the highest under W2 treatment (3.79 kg/m3-12.66 kg/m3), which was 43.02 %-98.74 % and 5.59 %-22.26 % higher than W0 and W1 treatment, respectively. The rate is also significantly higher than W0 and W1.【Conclusion】This study believes that the supplemental irrigation with water layer 7-9d before panicle initiation and the water layer 3-5 days after panicle initiation can effectively reduce the irrigation amount, irrigation and drainage times, and improve irrigation water use efficiency and precipitation utilization. Stabilizing rice yield is an intermittent irrigation method that is more suitable for high-yield water use in paddy fields in the Jianghuai region. |
| Key words: Intermittent irrigation; Intermittent days; Rice yield; Water use efficiency |
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