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| DOI：10.13522/j.cnki.ggps.2020466 |
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| Suitable Irrigation Scheduling for Spring Maize under Different Annual Precipitation Patterns in Hetao Irrigation District |
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XUE Jing, LI Xuqiang*, CHEN Junfeng, ZHENG Xiuqing, CHEN Xiaoyu
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Taiyuan University of Technology, Taiyuan 030024, China
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| Abstract: |
| 【Background】Hetao irrigation district in Inner Mongolia is the largest managed irrigation district in China. As a major grain and oil production base in western China, its agriculture relies on irrigation using water taken from the Yellow River. With available water for diversion from the river dwindling, improving irrigation water use efficiency has become increasingly important to sustain crop production in this region. One technology developed over the past few years is to use the saline groundwater as a complementary water resource in the after-autumn irrigation, with the spring and autumn irrigations using the river water. The efficacy of such alternate irrigations depends on intra-annual precipitation.【Objective】The purpose of this paper is to study a suitable autumn irrigation scheduling for spring maize in that it meets the requirement of the crops sown in the following spring by moistening the soil while in the meantime keeping soil salinity not exceeding a threshold value.【Method】The experiment was conducted at Shahaoqu experiment station in the district. Data measured from the fields were used to calibrate the SWAP-WOFOST model, and the calibrated model was then used to compare different autumn irrigation schedules for spring maize based on precipitation data measured from 1987 to 2017.【Result】The SWAP-WOFOST model can accurately simulate the dynamics of soil moisture, soil salt and temperature, as well as crop growth. The results indicated that in order to improve water productivity of the spring maize, the most suitable autumn irrigation amount was 200 mm, regardless of annual precipitations. We also found that the irrigation time needs to vary with precipitation pattern, started on 30 September in wet and normal years and on 30 October in dry years.【Conclusion】The SWAP-WOFOST model was able to simulate crop growth under different salt and water conditions, and can thus be used to help design irrigation scheduling for spring maize under different annual precipitation patterns in Hetao irrigation district and beyond. |
| Key words: autumn irrigation; SWAP-WOFOST model; spring maize; annual precipitation; water productivity |
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