| Abstrakt: |
In order to study the specific regulation effect of dinoconazole compounded with different exogenous substances (amine fresh fat, thidiazuron, prohexadione calcium, and parsamine) on cotton chemical capping and yield enhancement and quality improvement, Xinluzhong 84 was used as test material, and a randomized block design was used. Foliar spraying was carried out before chemical topping (July 5) and during chemical topping (July 15) to determine the plant type, photosynthesis, dry matter accumulation and distribution, yield and quality of cotton. The results showed that there was no significant difference in plant height among the treatments, while the plant width of cotton decreased after chemical capping, but the number of leaves and fruit branches on the main stem increased to a certain extent. The compound treatment of diluconazole could effectively improve the canopy structure of cotton plants. Among them, the leaf area index and canopy opening degree of diconazole compound treatment with thidiazuron were the highest in each period, and the average leaf inclination angle was higher than that in artificial boll stage. The topping control increased by 3.21%. Diluconazole compound treatment could effectively promote leaf photosynthesis, among which the net photosynthetic rate, transpiration rate, stomatal conductance, intercellular CO2 concentration showed the highest performance, which increased by 87.54%, 90.12%, 170.03% and 27.77%, respectively, compared with the manual topping photos. And the total dry matter weight of reproductive organs per plant was also the highest, reaching 62.19 g, an increase of 28.04% compared with the artificial topping control. The optimal combination in this study was the treatment of uniconazole combined with thidiazuron (W2), the number of bolls per plant was 5.43, the weight per boll was 6.24 g, the yield of seed cotton was 7 330.29 kgµhm-2, and the yield of lint cotton was 3 302.87 kgµhm-2. The highest and the least impact on fiber quality. The results provided theoretical basis and practical reference for the whole process of cotton mechanization in Xinjiang. [ABSTRACT FROM AUTHOR] |
