| Cite this article: | 杨宗凯,谭军利,王西娜,等.滴头流量对压砂土壤水盐分布及西瓜生长、产量的影响[J].灌溉排水学报,0,():-. |
| Yang Zongkai,Tan Junli,Wang Xina,et al.滴头流量对压砂土壤水盐分布及西瓜生长、产量的影响[J].灌溉排水学报,0,():-. |
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| Effect of Different Emitter Discharge Rate on Water and Salt Distribution in Gravel-sand Mulched Field and Growth and Yield of Watermelon |
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Yang Zongkai1, Tan Junli1, Wang Xina2, Ma Rui2
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1.School of civil and hydraulic engineering,Ningxia University,Yinchuan;2.College of agriculture,Ningxia University,Yinchuan
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| Abstract: |
| Abstract: 【Objective】In order to explore the effect of emitter discharge rate on distribution of water and salt in gravel-sand mulched field, watermelon growth and yield under saline water irrigation in gravel-sand mulched field, and provides a theoretical basis for the optimization of drip irrigation parameters of watermelons in sandy soil.【Method】 Through the field experiment, three kinds of dripper flow were set up, which were 2 L/h, 3 L/h and 4 L/h, the effects of emitter discharge rate on distribution of water and salt, watermelon growth, yield, fruit quality and water use efficiency before and after irrigation were studied.【Result】Under the test conditions, the larger the emitter flow, the larger the horizontal wetting range of the soil, the higher the soil moisture content between the films, and the shallower the vertical wetting depth below the emitter. The soil salt content in 0-100 cm depth of each treatment decreased after a whole watermelon growth period, and the decrease of salt content increased with the increase of emitter flow. The soluble sugar content of fruit increased first and then decreased with the increase of emitter flow rate. The treatment of 3 L/h was the largest, which increased 54.3% and 22.3% compared with 2 L/h and 4 L/h respectively; The content of vitamin C decreased first and then increased with the increase of emitter flow rate, and the highest content was 4 L/h, which was 53.7% higher than that of 3 L/h. Watermelon yield and irrigation water use efficiency increased with the increase of emitter flow. The yield and irrigation water use efficiency of 4 L/h treatment increased by 6.20% and 3.56%, 6.49% and 3.72% respectively compared with 2 L/h and 3 L/h. 【Conclusion】 Considering the redistribution form of soil water and salt and the yield and quality of watermelon, the emitter discharge rate of saline water applicable to the local area is 4 L/h. |
| Key words: Drip irrigation; Emitter discharge rate; Gravel-sand mulched field; Saline water; Distribution of water and salt; Watermelon; |
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