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| Effects of irrigation level and frequency on growth and water use efficiency of maize |
| TIAN Jianke1,2, ZHANG Fucang1,2, QIANG Shengcai1,2, ZOU Haiyang1,2, WU You1,2, YAN Shicheng1,2 |
| 1.Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China; 2.Institute of Water-saving Agriculture in Arid Areas of China, Yangling, Shaanxi 712100, China |
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Abstract In order to explore effects of irrigation level and frequency on growth, yields and water use efficiency of maize(Zhengdan-958), pot cultivating experiments are conducted in a rain shelter by using nine cases which include three irrigation levels(W1, W2, and W3 for 120%, 100%, and 80% ETc)and three frequencies(D1, D2, and D3 for 3 d, 6 d and 9 d intervals). Various growth indices of maize plants are observed and analyzed during their growth periods in the experiments. The results show that the plant height, leaf area, dry weight and yield rise with increasing irrigation level, but decrease with increasing irrigation frequency. Significance analysis indicates that irrigation level affects plant growth and yield more substantially than irrigation frequency does. The maximum maize yield per plant is achieved in case W1D3, while the minimum yield is obtained in case W3D1, showing a significant difference. Furthermore, both water use efficiency and irrigation water use efficiency increase initially and then decrease with increasing irrigation level, but they decrease steadily with increasing irrigation frequency. The water use efficiency and irrigation water use efficiency are the best in case W2D3, reaching 1.83 kg/m3 and 1.61 kg/m3, respectively. Overall, case W1D3(120%ETc, 9 d intervals)can be a more feasible irrigation proposal under the present experimental conditions.
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Received: 27 November 2015
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