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- Title
机采模式下耐旱性不同棉花品种冠层特性对滴水量的响应.
- Authors
张虎梅; 田雨; 石峰; 李军宏; 韩焕勇; 王方永; 罗宏海
- Abstract
【Objective】</strong> The objective of this study is to explore the response of different canopy characteristics of drought-tolerant cotton varieties to drip water quantity and the mechanism of action under the equidistant row spacing dense machine harvesting model in the hope of providing a theoretical basis for the selection of water-saving irrigation and drought-tolerant varieties for cotton in arid areas.<strong>【Methods】</strong> The cultivars Xinluzao 22 with drought-tolerant cultivar and Xinluzao 17 with drought sensitive cultivar were selected as test varieties and the impacts of drip irrigation treatments: deficient drip irrigation (W1), limited drip irrigation(W2) and conventional drip irrigation(W3) on cotton canopy structure, light distribution, canopy apparent photosynthetic rate, canopy respiration rate and yield of different drought-tolerant cotton varieties were studied.<strong>【Results】</strong> With the increase of dripping water, cotton chlorophyll content(Chl), canopy apparent photosynthetic rate(CAP)and canopy respiration rate(CR)all showed a significant upward trend and maximum under W3 treatment. Among them, Xinluzao 22 was not significantly different from the above parameters under W2 and W3 conditions from peak flowering stage to later full boll stage, but both were significantly lower than W1 treatment. Difuse non-interceptance(DIFN)and transmitted PAR rate showed a decreasing trend with the increase drip water, with W1> W2,W3 among all treatments. Xinluzao 17 and Xinluzao 22 had the highest yield under W3 and W2 treatments, respectively. And the irrigation water use efficiency was highest by W2. Among the cultivars, Chl, LAI, CAP and CR of Xinluzao 22 were 0.8%~10.5%, 3.4%~15.0%, 1.3%~16.7%, 2.9%~22.9% higher than Xinluzao 17 from the peak flowering to the boll opening stage, the yield and irrigation water use efficiency were 8.9%, 9.2% higher than Xinluzao 17. Correlation analysis showed that Chl, LAI, CAP and CR were positively correlated with yield, and DIFN was negatively correlated.<strong>【Conclusion】</strong> Under equidistant row spacing with high density conditions, depending on the moisture sensitivity of the variety, drip irrigation of 3,900-4,800 m³/hm² could maintain higher chlorophyll content and leaf area index, which is suitable difuse non-interceptance, and uniform light distribution of cotton in the middle of reproduction, thus enhanci canopy apparent photosynthetic rate and water use efficiency without sacrificing yield.
- Publication
Xinjiang Agricultural Sciences, 2022, Vol 59, Issue 12, p2888
- ISSN
1001-4330
- Publication type
Article
- DOI
10.6048/j.issn.1001-4330.2022.12.004