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| Effect of saline water irrigation on water-salt distribution and yield of wheat |
| LI Guoan1, JIANG Jing1, MA Juanjuan1, ZHANG Jibin2, GUO Xianghong1 |
| 1.College of Water Resources Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China; 2. Shanxi Water Engineering Construction Supervision Co., LTD, Taiyuan, Shanxi 030002, China |
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Abstract Field experiments were carried out in the middle reaches of the Shiyang River Basin from 2014 to 2015. Three irrigation amount levels of 355, 280, and 205mm(W1,W2, and W3)and four water salinity levels of 0.70, 3.0, 5.0, and 7.0 g/L(S1, S2, S3, and S4)were settled in the experiments. There were 12 treatments in total and three replicates per treatment. The results showed that: Under freshwater irrigation, salt accumulation rate was less than 15%. However, peak value of salt accumulation was in the 20-40 cm layer. About 40-80% of salt which brought by irrigation accumulated around 60 cm depth while water salinity was higher than 3.0 g/L. Yield reduction of spring wheat under salt stress was less than 10% while water salinity was 3.0 g/L. However, yield reduction was up to 28% under water salinity 5.0 g/L and 7.0 g/L. Compared with sufficient irrigationW1 at the same water salinity, yield reduction in W2 and W3 was about 10% and 15%.Jointing to filling stage is the critical water requirement period, therefore, irrigation should be timely applied. Under three irrigation amount levels, root zone water content can be maintained in the range of 60-80% field capacity. It can be concluded that water salinity of 3.0 g/L will not cause a significant yield reduction of spring wheat. Soil moisture can be guaranteed in suitable level with irrigation amount 205-355 mm,and irrigation time should be regulated reasonably.
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Received: 29 November 2016
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