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| DOI：10.13522/j.cnki.ggps.20180245 |
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| Effects of Critical Soil Moistures for Different Drip Irrigations on Growth, Water Consumption and Yield of Greenhouse Green Eggplant |
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HU Lan, ZHAI Guoliang, DENG Zhong, CAI Jiumao, ZHANG Wenzheng, GAO Jianmin
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1. Chinese Academy of Agricultural Sciences Farmland Irrigation Research Institute/Key Laboratory of Water-saving Agriculture Project of Ministry of Agriculture, Xinxiang 453002, China;2. Graduate School of Chinese Academy of Agricultural Sciences, Beijing 100081, China
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| Abstract: |
| 【Objective】 The critical moisture for irrigation is a parameter in determining irrigation schedule, and this paper studies its effect on growth, water consumption and yield of greenhouse eggplant under surface drip irrigation and plug-in subsurface drip irrigation.【Method】The plug-in subsurface drip irrigation was to insert the emitter into the root zone (SDI-R) and the surface drip irrigation was to drip water over the soil surface (DI). We examined four critical soil moisture: 60% of the field capacity (θF) at flowering/fruit-setting stage and 60% of θF at maturing stage (F60M60), 60% of θF at flowering/fruit-setting stage and 70% of θF at maturing stage (F60M70), 70% of θF at flowering/fruit-setting stage and 60% of θF at maturing stage (F70M60), 70% of θF at flowering/fruit-setting stage and 70% of θF at maturing stage (F70M70). In each treatment, we measured plant height, root dry matter, yield, water consumption and water use efficiency. 【Result】Both plant height and total dry root mass were higher under SDI-R than under DI, and the total water consumption and water consumption during each growth stage were lower under SDI-R than under DI. The maximum total water consumption under DI+F70M70 and SDI-R+F70M70 was 338.09 mm and 331.25 mm respectively, lower than under other treatments. Under the four critical soil moistures, the water consumption under DI was 2.06% to 16.67%, higher than those under SDI-R. SDI-R+F60M70 gave the highest yield and water use efficiency at 56 046.30 kg/hm2 and 20.43 kg/m3 respectively. Under DI, the yield under F70M70 was 51 546.30 kg/hm2, with the highest water use efficiency of 15.24 kg/m3. 【Conclusion】Plug-in subsurface drip irrigation increased yield and water use efficiency compared to surface drip irrigation in all treatments, especially when the critical moisture at flowering/fruit-setting stage was 60% of θF and at maturing stage was 70% of θF. |
| Key words: drip irrigation; critical soil moisture; plant growth; water consumption; yield |
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