| Research on irrigation schedule of cotton drip irrigation under plastic film based on the different ground water table in arid areas |
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| DOI：10.7606/j.issn.1000-7601.2014.03.013 |
| Key Words: drip irrigation under plastic film cotton irrigation quota depth of groundwater table simulation hydrus |
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| Abstract: |
| Through the irrigation schedule experiment of drip irrigation cotton under plastic film in Korla Irrigation Experiment Station, Xinjiang, has obtained the suitable local conventional drip irrigation schedule. In order to further study the compensation effect of shallow groundwater to the irrigation, we use the Hydrus software to simulate the water consumption in growing stage of drip irrigation co
tton under plastic film with different groundwater table. Through dwawing into the concept of key point soil water content, put forward the criterion of cotton water stress by the drip irrigation under plastic film. The results showed that: The ground water has a certain compensating function for the cotton water consumption, the shallower groundwater table, the smaller irrigation quota required.
When the groundwater table was less than 1.5 m, the drip irrigation quota was 3300 m3·hm-2. When the groundwater table was 2.0 m, the drip irrigation quota was 4500 m3·hm-2. When the groundwater table was so biger and no any compensation, the cotton growth totally rely on the drip irrigation, the drip irrigation quota was 5550 m3·hm-2. Consided the high evaporation potential in the arid area, it will cause the soil salinity to damage crop growth, the ground water table of 1.5 m to 3.0 m was the desired depth. This conclusion is not only the complementary and improvement to the conventional cotton irrigation schedule, but also this proposed method will have the guide and reference role for management and establishing the crop consumption quota of drip irrigation under plastic film in arid area. |
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