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| DOI：10.13522/j.cnki.ggps.20180559 |
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| The Effects of Water Pressure in the Micro-tube on Growth and Water Use Efficiency of Greenhouse Tomato under Micro-tube Irrigation |
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LI Zhaoyang, WANG Xingpeng, ZHANG Qiangwei
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1. College of Water Resource and Architectural Engineering, Tarim University, Alaer 843300, China; 2. Key Laboratory of Modern Agricultural Engineering, Tarim University, Alaer 843300, China
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| Abstract: |
| 【Conclusion】 Micro-tube irrigation is a technique used in greenhouse irrigation, and the aim of this paper is to investigate the impact of water pressure in the micro-tube on growth and water use efficiency of greenhouse tomato. 【Method】 We examined four pressures: 1 m (T1), 1.5 m (T2), 2 m (T3) and 2.5 m (T4), and compared them with standard drip irrigation (CK). For each pressure, we measured soil moisture distribution, tomato growth and yield, as well as water consumption and water use efficiency of the crop. 【Result】 The pressure significantly affected soil moisture content and the size of the wetting zone. Soil moisture content under micro-tube irrigation was higher than that under CK, forming a continuous and stable water environment for crop to grow. The drying rate of soil moisture increased inversely with the pressure. For example, 100 days after irrigation, the soil moisture associated with T1, T2, T3 and T4 decreased by 24.9%, 21.54%, 19.18% and 16.93% respectively, compared to those after 20 days; increasing the pressure improved soil water stability. The standard drip irrigation worked better for plant growth during its early stage, whereas as plant grew, the micro-tube irrigation edged ahead. Growth rate, height and stem diameter of the plant were all proportional to the pressure. Water consumption during flowering and fruiting stage was higher than at seedling and harvest stages. During the whole growing season, water consumption under T1, T2, T3 and T4 was 192.3, 216.4, 235.8, 262.3 mm, respectively, with their water use efficiency ranked in CK
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| Key words: micro-irrigation; head pressure; soil moisture; tomato; water use efficiency; greenhouse |
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