| Cite this article: | 刘承岳,杨广,王春霞,等.灌水量与覆膜对棉花光合特性与产量构成的影响[J].灌溉排水学报,0,():-. |
| LIU Chengyue,YANG Guang,WANG Chunxia,et al.灌水量与覆膜对棉花光合特性与产量构成的影响[J].灌溉排水学报,0,():-. |
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| The Effect of Irrigation and Mulching on the Photosynthetic Characteristics and Yield Composition of Cotton |
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LIU Chengyue, YANG Guang, WANG Chunxia, ZHANG Heng, ZHANG Shuo, SUN Rui
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College of Water Conservancy Architectural Engineering,Shihezi University,Shihezi
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| Abstract: |
| 【Objective】To investigate the effect of moisture on the photosynthetic characteristics and yield composition of cotton under mulching conditions, reveal the impact of strong human activities on cotton physiological growth, and provide the basis for sustainable large-scale promotion of water-saving technologies. 【Method】This article adopts a two factor split field experiment, the main area is the irrigation amount, which is 3360 m3·hm-2 (W1), 4200 m3·hm-2 (W2), and 5040m3·hm-2 (W3) respectively; The sub area is of covering type, with two covering methods: film covering (P1) and bare soil covering (P2). Based on the analysis of the physiological growth characteristics of cotton under different irrigation gradients and film covering combination modes, this study explores the response mechanism of cotton to film covering and different irrigation gradients. 【Result】(1) Under irrigation levels of W1, W2, and W3 during the bolling period, the net photosynthetic rate of the mulching treatment was 17.15%, 13.84%, and 10.86% higher than that of the bare soil treatment, and the transpiration rate was 10.91%, 9.57%, and 4.93% higher; Under mulching conditions, the net photosynthetic rate of W3 treatment was 14.76%, 31.69% higher than that of W1 and W2 treatments, and the transpiration rate was 35.87%, 12.39% higher. Both mulching and irrigation can promote the net photosynthetic rate and transpiration rate of cotton, but as the amount of irrigation increases, the promoting effect of mulching on net photosynthetic rate and transpiration rate gradually decreases. (2) Film mulching can promote cotton growth. Under P1 treatment, the leaf area index and SPAD value of cotton reach their maximum values in the early stage of flowering and boll formation, while under P2 treatment, the leaf area index and relative chlorophyll content (SPAD value) of cotton reach their maximum values in the late stage of flowering and boll formation. During the growth period, the leaf area index and SPAD value of cotton in each treatment show a single peak curve of first increasing and then decreasing. (3) Film mulching not only increases the accumulation of dry matter in cotton, but also increases the proportion of dry matter in cotton reproductive organs, which is beneficial for converting photosynthetic substances into yield. The proportion of dry matter in cotton reproductive organs was 8.76%, 8.61%, and 7.53% higher under different irrigation gradients in P1 treatment than in P2 treatment during the flowering and boll stage. The irrigation amount and mulching treatment also have a promoting effect on the dry matter accumulation rate. Under the same mulching conditions, the dry matter accumulation rate of different irrigation treatments is W1
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| Key words: cotton; drip irrigation; mulching; photosynthetic characteristics; yield |
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