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| DOI：10.13522/j.cnki.ggps.2019004 |
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| Effects of Drip Irrigation Schedule on Water and Salt Movement in Soil |
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CAO Zhenxi, LI Yong, SHEN Xiaojun, SONG Ni, WANG Feng, WANG Xingpeng
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1. Institute of Farmland Irrigation, Chinese Academy of Agricultural Sciences/Key Open Laboratory of Crop Water Demand and Regulation, Ministry of Agriculture, Urumqi 453002, China; 2. Graduate School of Chinese Academy of Agricultural Sciences, Beijing 100081, China; 3. School of Water Conservancy and Construction Engineering, Tarim University, Alar 843300, China
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| Abstract: |
| 【Objective】Salt movement and accumulation in soil is modulated by rainfall and irrigation. This paper aims to elucidate the impact of drip irrigation schedule on water and solute movement in a farmland soil. 【Method】The experiment was conducted in a saline-alkali rooted soil, and we compared three two dripping rates (per emitter): 2.8 L/h and 5.6 L/h, and three irrigation amounts: 22.5 mm, 37.5 mm and 52.5 mm (per emitter).【Result】When the irrigation amount was the same, increasing dripping rate increased the radius of the wetting front, and made the moisture distribution broader and shallower and the surface soil more moist. When the dripping rate was the same, increasing irrigation amount increased both the radius of the wetting front and soil water content. Soil salinity in top 50cm soil layer increased with dripping rate and irrigation amount; the desalination radius and desalination depth were 30 cm and 60 cm respectively when the dripping rate was 2.8 L/h, and 40 cm and 40 cm respectively when the dripping rate doubled.【Conclusion】Our results showed that the desalination was best when dripping rate was 5.6 L/h and irrigation quota was 52.5 mm. |
| Key words: irrigation schedule; drip irrigation; water and salt movement; desalination |
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