Effects of Soil Water Regulation on the Cotton Yield, Fiber Quality and Soil Salt Accumulation under Mulched Drip Irrigation in Southern Xinjiang, China

被引:15
作者
He, Pingru [1 ]
Yu, Shuang'en [1 ]
Zhang, Fucang [2 ]
Ma, Tao [1 ]
Ding, Jihui [1 ]
Chen, Kaiwen [1 ]
Chen, Xin [1 ]
Dai, Yan [1 ]
机构
[1] Hohai Univ, Coll Agr Sci & Engn, Nanjing 210098, Peoples R China
[2] Northwest A&F Univ, Minist Educ, Key Lab Agr Soil & Water Engn Arid & Semiarid Are, Xianyang 712100, Peoples R China
来源
AGRONOMY-BASEL | 2022年 / 12卷 / 05期
基金
中国国家自然科学基金;
关键词
soil water lower limit; water consumption modulus; fiber quality; soil salt accumulation; entropy TOPSIS method; USE EFFICIENCY; GROWTH; MAIZE; ROOT;
D O I
10.3390/agronomy12051246
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
To optimize suitable water-saving and soil salt-controlling irrigation needed for the high yield and good quality of cotton in southern Xinjiang, a field experiment was carried out to study the effects of soil water lower limits on water consumption, water use efficiency (WUE), yield, cotton fiber quality and soil salt accumulation under mulched drip irrigation in Korla, Xinjiang. The field capacity (FC) was regarded as the upper limit of soil moisture, and five soil water lower limits (85% FC, 75% FC, 65% FC, 55% FC, 45% FC, referred as T1-T5, respectively) were designed during the cotton growth period. The results indicated that the irrigation frequency and irrigation quota of cotton were gradually increased with the increase in the soil water lower limit, while the water consumption modulus for T2 treatment during the critical period of water demand arrived at the maximum value. Moreover, with the decrease in the soil water lower limit, the WUE, fiber micronaire value and fiber maturity index of cotton increased, whereas the yield, nitrogen partial factor productivity (PFPN) and fiber breaking elongation of cotton decreased. However, when the soil water lower limit exceeded 75% FC, the increase had little effect on the cotton yield increase and PFPN improvement, and the yield and PFPN for T2 treatment were 7146.4 kg.hm(-2) and 23.82 kg.kg(-1), respectively, In addition, the decrease in the soil water lower limit was unfavorable for an increase in fiber length, but it was conducive to the enhancement of fiber strength. Furthermore, soil salt accumulated inside and outside the film for the designed soil water lower limits, and the amount of accumulated salt in 0-100 cm followed T3 > T5 > T1 > T2 > T4. Based on a comprehensive analysis with the entropy TOPSIS method, the findings of the present study suggested that the suitable soil water lower limit for cotton under mulched drip irrigation was 75% FC in southern Xinjiang, China.
引用
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页数:18
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