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| DOI：10.13522/j.cnki.ggps.2021448 |
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| The Effect of Soil Moisture on Water Consumption and Growth of Rice |
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YANG Cheng, CHEN Yizhou, MA Shihao, WANG Guibing, ZHANG Geng, LI Xiaokun
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1. College of Resources and Environment, Huazhong Agricultural University/Key Laboratory of Arable Land Conservation
(Middle and Lower Reaches of Yangtze River), Ministry of Agriculture and Rural Affairs/Microelement Research Center,
Huazhong Agricultural University, Wuhan 430070, China; 2. Shuangshui Shuanglu Institute, Huazhong Agricultural University,
Wuhan 430070, China; 3. Ministry of Agriculture National Agricultural Technology Extension Service Center, Beijing 100125, China
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| Abstract: |
| 【Objective】 Maintaining soil moisture at a rational level not only improves water use efficiency but also benefits crop growth and grain quality. Taking rice as an example, this paper presents an experimental study of the effect of soil moisture on growth and water consumption of the crop.【Method】The experiment was conducted in pots, with the variety “Yangliangyou 6” used as the model plant. The soil moisture was kept at >90% (CK), 75%~90% (W2), 60%~75% (W3) and 45%~60% (W4) of the field capacity, respectively. In each treatment, we measured the total water consumption and water consumption intensity, biomass, yield, water use efficiency, and water potential in the leaves of the rice.【Result】A decrease in soil water content reduced water consumption of the rice. Compared with CK, W2, W3 and W4 reduced total water consumption by 32.4%, 58.7% and 69.9%, respectively, and water consumption intensity by 32.4%, 61.5% and 73.5%, respectively. The water use efficiency of W2 was significantly higher than that in other treatments. Compared with W1, W2 increased water use efficiency by 24.5% but reduced grain yield and biomass by 13.2% and 12.4%, respectively. In contrast, W3 and W4 reduced water use efficiency by 36.0% and 74.7%, respectively, compared to W1. 【Conclusion】 Considering water use efficiency and crop growth, maintaining soil water content at 75%~90% of the field capacity is optimal for improving water use efficiency, reducing water consumption without scarifying rice yield. It can be used as an improved irrigation method for rice production in the studied area. |
| Key words: water deficit; rice; water consumption characteristics; water use efficiency |
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