| Effects of regulated deficit irrigation on pepper growth and yield under drip irrigation in oasis region |
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| DOI：10.7606/j.issn.1000-7601.2019.02.04 |
| Key Words: regulated deficit irrigation drip irrigation pepper water use efficiency yield the oasis region |
| Author Name | Affiliation | | GAO Jia | School of Water Resource and Hydropower, Gansu Agricultural University,Lanzhou, Gansu 730070, China | | ZHANG Heng-jia | School of Water Resource and Hydropower, Gansu Agricultural University,Lanzhou, Gansu 730070, China | | BA Yu-chun | Administration of Hongshuihe River, Minle, Gansu 734500, China | | WANG Yu-cai | School of Water Resource and Hydropower, Gansu Agricultural University,Lanzhou, Gansu 730070, China | | LI Fu-qiang | School of Water Resource and Hydropower, Gansu Agricultural University,Lanzhou, Gansu 730070, China | | WANG Ze-yi | School of Water Resource and Hydropower, Gansu Agricultural University,Lanzhou, Gansu 730070, China | | ZHANG Wan-heng | School of Water Resource and Hydropower, Gansu Agricultural University,Lanzhou, Gansu 730070, China | | JIANG Tian-liang | School of Water Resource and Hydropower, Gansu Agricultural University,Lanzhou, Gansu 730070, China |
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| Abstract: |
| To ascertain the mechanisms of the pepper production under regulated deficit irrigation (RDI) during the growth season, we conducted an experiment with full irrigation (75%~85% field water capacity of θf) as the contrast, irrigation at different reduced levels: mild water deficit in seedling stage (65%~75% of θf) as WD1, moderate water deficit in seedling stage (55%~65% of θf) as WD2, severe water deficit in seedling stage (45%~55% of θf) as WD3, mild water deficit in seedling stage\|mild water deficit in later fruit period as WD4, moderate water deficit in seedling stage\|mild water deficit in later fruit period as WD5, and severe water deficit in seedling stage\|mild water deficit in later fruit period as WD6. The growth indexes (plant height, leaf area index, and root crown ratio) and the yield and water use efficiency of pepper were determined. The results showed that the growth of plant height and leaf area were inhibited by the different RDI treatments at seedling stage; The plant height reduced by 18.0%~37.4% and the leaf area index decreased by 22.6%~54.6% of WD2 and WD3 significantly compared to CK respectively in the later fruit stage (P＜0.05, the same below). The treatment with moderate WD2 at seedling stage made the root\|shoot ratio of pepper increase by 14.97% significiantly than CK at the whole pepper growing season. WD1 treatment had no significant influence on pepper yield; WD2 and WD3 treatments decreased 4.3% of yield and 17.2% of yield, respectively. The water consumption of pepper in different growing stages reduced by 0.7%~19.8% than CK during the whole growth period. The WUE of WD5 was the highest (139.47 kg·mm·hm-2), and its yield was 34 746.12 kg·hm-2. The plant height and leaf area index of pepper were not affected by the mild water deficit in later fruit stage, and the water use efficiency increased by 9.20% without yield reduction. Therefore, applying moderate water deficit （55%~65% of θf） during seedling period and applying mild water deficit （65%~75% of θf）during later fruit and full irrigation at other period was a better irrigation technique to achieve water\|saving, high\|yield and high\|efficient pepper cultivation in oasis region. |
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