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| DOI：10.13522/j.cnki.ggps.20180096 |
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| Improving Photosynthesis and Water Use Efficiency of Winter Wheat and Summer Maize by Coupling Alternate Furrow Irrigation and Regulated Water Deficit |
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LI Biao, MENG Zhaojiang, SHEN Xiaojun, LIU Xiaofei, CHANG Xiao
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1.Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China; 2.Graduate School of Chinese Academy of Agriculture Sciences, Beijing 100081, China
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| Abstract: |
| 【Objective】 Improving irrigation efficiency plays a key role in developing sustainable agriculture and the purpose of this paper was to investigate the effects of alternate furrow irrigation with regulated water deficit on photosynthesis and yields of rotated winter wheat and summer maize. 【Method】 Experiments were conducted in lysimeters under a rainproof shelter in 2016—2017 with three treatments: conventional border irrigation (T1), standard alternate furrow irrigation (T2), and alternate furrow irrigation with regulated water deficit (T3). During the experiments, the photosynthesis, water use efficiency (WUE) and the yields of the wheat and the maize were measured at different growth stages. 【Result】The net photosynthetic rate and the transpiration rate of the two crops under T1 were higher than that under T3, but re-watering after water stress could compensate the lost photosynthesis , thereby maintaining yields. The yields of the two crops under T1 was higher than those T2 and T3, but its water use efficiency was low. Compared to T1, T2 and T3 reduced the wheat yield by 1.98% (p>0.05) and 5.68% (p<0.05), while reduced water consumptions by 10.01% (p<0.01) and 16.91% (p<0.01) with their associated WUE increasing by 9.04% (p<0.05) and 15.82% (p<0.01) respectively. Similarly, compared to T1, T2 and T3 reduced the maize yield by 2.93% (p>0.05) and 6.21% (p<0.05) respectively, but increased the WUE by 10.06%(p<0.05) and 17.32% (p<0.01) respectively. 【Conclusion】 Alternate furrow irrigation by imposing a water deficit of 55%~65% of field moisture capacity at the returning green stage of the winter and a water deficit of 60%~70% of field moisture capacity at the seedling stage of summer maize can substantially improve WUE without considerably scarifying their yields. |
| Key words: regulated deficit irrigation; alternate furrow irrigation; winter wheat; summer maize; photosynthetic characteristics; yields |
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