| The study on watersaving mechanism and irrigation program with cotton drip irrigation under plastic film in drought and water shortage area |
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| DOI：10.7606/j.issn.1000-7601.2018.02.12 |
| Key Words: drip irrigation under film cotton lateral placements irrigation quota drought and water shortage area |
| Author Name | Affiliation | | SHI Yan | College of Water Conservancy and Hydropower Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Water Resources Technical Service Center, Wuwei, Gansu 733000, China
Management Department of the Electric Power Irrigation Project, Dashagou, Lanzhou, Gansu 730070, China | | ZHANG Jin-xia | College of Water Conservancy and Hydropower Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | DONG Ping-guo | Water Resources Technical Service Center, Wuwei, Gansu 733000, China | | CHENG Zi-yong | College of Water Conservancy and Hydropower Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | SHI Pei-ze | Water Resources Technical Service Center, Wuwei, Gansu 733000, China |
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| Abstract: |
| The experimental investigations on watersaving mechanism and irrigation program with cotton drip irrigation under plastic film have been done in the Shiyang River Basin. Results showed that: The water consumption with G1 scheme was close to that with G2 scheme, changed in 247～276 m3·667m-2. The yield of cotton drip irrigation increased with the irrigation quota, and the G2 scheme (the 20 m3·667m-2) was the high yield irrigation quota for cotton under film drip irrigation. When the irrigation amount was below 80～90 m3·667m-2, the yield has a linear increase with the quota, which indicated that water played a crucial role in this stage. When that was 90～115 m3·667m-2, the yield has a curve increase with the quota,which showed that the increasing yield effect of water is gradually slowing down. When that was higher than 115～120 m3·667m-2, the less yield the more irrigation quota.At the same irrigation amount, the effects of tubular billet layout on cotton water consumption had no significant differences. A tube with three lines was slightly higher than a tube with four lines.With the increase of irrigation amount, the water consumption modulus and the irrigation quota were in reverse relationship.Under different irrigation amount, the daily transpiration showed the same trend, that is, big medium-term stage and small in the earlier and later stage. Both a tube with three lines and a tube with four linescould reach to high yield level,which capillary spaces could be extended to 80-100cm, and capillary inputs could be less 33%～50% than the current situation. So, both were water saving and high efficiency irrigation method for cotton at in drought and water shortage area. The irrigation system, which irrigation firstly at the squaring stage, lastly at the beginning of boll opening stage, 2～4 times at the boll stage ( the key water requirementperiod for cotton), 20 m3·667m-2 each time, total 4～6 times and 80～120 m3·667m-2 at the whole growth period, was high yield irrigation mode.The lower value of soil moisture was kept in a suitable range (more than 60% before the flowering stage, 45%～60% at the boll stage, 50% between the boll opening to harveststage), which could meet the needs of crop nutrition and reproductive growth on soil moisture. |
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