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| DOI： |
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| The Impact of Frequency of Surface Drip Irrigation with Saline Water on Salt Accumulation on Mulched Soil Surface |
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MA Tingting, XUE Xian, HUANG Cuihua, QIN Weizhi, LUO Jun, WANG Tao
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Key laboratory of Desert and Desertification, Northwest Institute of Eco-environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China; University of Chinese Academy of Sciences, Beijing 100049, China; Gansu Yuangang Agriculture and Forestry Development co., LTD, Lanzhou 730000, China
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| Abstract: |
| How to use saline water for irrigation is an important issue in agriculture production in arid regions, and this paper investigated the effect of the frequency of drip irrigation with saline water on salt accumulation in the proximityof mulched soil surface. Three treatments were examined, irrigation after each 24 h (T1), after each 48 h (T2) and after each 72 h (T3). The results showed that: ①The moisture content at soil surface in T2 was 0.5%~1.0% higher than that under T1 and T3, and the area and depth of the wetting area in the soil under T2 was also larger than that under T1 and T3 at the late stage of the experiment; ②Overall, the electrical conductivity (EC) in all treatments increased during the experiment, but the change of EC in T2 was slow compared with T1 and T3, indicating less salt accumulation; ③ pH increased in the halfway of the experiment, and then decreased at the late stage with a value approximately 8.5. ④The variation of the contents of salt ions during the experiment was low under frozen condition, and at the late stage of the experiment the content of HCO-3 was more than 120.0 mg/kg. The soil total alkalinity increased during the experiment. In summary, T2 appears to be the most appropriate method for irrigation using saline water in Minqin Oasis. However, care needs to be taken as our experiments revealed that irrigation using saline waters is likely to make soil alkaline. Thus, an appropriate irrigation and drainage combination is required to avoid secondary saline-alkalization in using saline water for irrigation. |
| Key words: Minqin oasis; saline water; drip irrigation frequency; electrical conductivity; soil moisture |
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