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| DOI：10.13522/j.cnki.ggps.2019194 |
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| The Effects of Drip-irrigation Scheduling without Mulching on Soil Moisture, Yield and Quality of Cotton in Southern Xinjiang |
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WANG Hongbo, CAO Hui, GAO Yang, WANG Xingpeng
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1. College of Water Resource and Architecture Engineering, Tarim University, Alaer 843300, China；2. Key Laboratory of Modern Agricultural Engineering, Tarim University, Alaer 843300, China；3. Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China
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| Abstract: |
| 【Background】The use of plastic film mulching in drip irrigation of cotton in Xinjiang had led to plastic pollution over the past decades and easing the film pollution is not only a practical issue but also a research interest. One alternative is not to mulch, in which understanding the response of growth, yield and quality of cotton to soil moisture and irrigation scheduling is essential to sustaining cotton production without scarifying environment.【Objective】This paper is to experimentally study the effects of drip irrigation scheduling without mulching on soil moisture, growth, yield and quality of cotton in southern Xinjiang.【Method】We compared four irrigation levels: 36 mm (I1), 45 mm (I2), 54 mm (I3) and 36 mm (I4), with mulching taken as control for each treatment.【Result】As irrigation amount increased, stem diameter and plant height increased more significantly in the control than without mulching. The soil moisture in 0~60 cm soil layer increased with irrigation amount for both control and the treatments, but the soil moisture change in the former was more oscillating than in the latter. The yield of seed cotton without mulching increased significantly with irrigation amount. In particular, the yield of I3 was 7 195.48 kg/hm2, up 19.54% compared to the control. Not mulching improved cotton quality, while mulching was more water use efficient.【Conclusion】Results showed that drip-irrigating 54 mm of water without mulching was the optimal irrigation scheduling to best balance growth, yield and quality, and irrigation water use efficiency of the cotton. |
| Key words: cotton; drip irrigation without film mulching; cotton growth; yield and quality |
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