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| Effects of deficit irrigation on cotton growth and water use in southern Xinjiang of China |
| LIU Xiang1,2, ZHANG Fucang1,2*, XIANG Youzhen1,2, HOU Xianghao1,2, ZHANG Yingchun1,2,HE Pingru1,2, XUE Zhanqi1,2, FAN Junliang1,2 |
| 1. Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China;2. Institute of Water-saving Agriculture in Arid Areas of China, Northwest A&F University, Yangling, Shaanxi 712100, China |
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Abstract Aiming at the problem of the shortage of water resources and low water use efficiency of crops in the southern Xinjiang region, in this plot experiment,the cotton was used as the test species.Three irrigation levels(W1:50%ETc,W2:65%ETc,W3:80%ETc, ETc is the crop evapotranspiration)were set in the cotton budding stage, flowering stage and bolling stage, controlled by 100% ETc irrigation during the full growth period.The effects of deficit irrigation at different growth stages on cotton growth, yield, nitrogen uptake and water use efficiency under mulched drip irrigation were studied.The results show that the deficit irrigation at the budding stage has different degrees of inhibition on cotton plant height, LAI, above-ground dry matter growth, nitrogen accumulation and cotton yield, while the compensation effect was significant after rewatering.Among them, the cotton yield was reduced by 3.48% under the slight deficit irrigation(W3), and the WUE was as high as 1.57 kg/m3, which was significantly higher than the CK treatment of 1.48 kg/m3.Deficit irrigation at the flowering stage, the growth indicators of cotton have been significantly reduced, and the compensation effect is not significant after rewatering, hindering cotton growth and development.Deficit irrigation at the bolling stage had a significant inhibitory effect on above-ground dry matter accumulation, nitrogen absorption and cotton yield,while the WUE reached 1.51 kg/m3 under the W2 and W3 levels. In comprehensive consideration of achieving the goal of saving water and increasing production while ensuring the cotton yield, the irrigation of 80% ETc can be performed during the cotton budding stage, and fully irrigated during other growth stages to control the vegetative growth and promote the reproductive growth to obtain higher water use efficiency.
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Received: 16 December 2019
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