关键词: 调环酸钙, 棉花, 农艺性状, 生物量, 产量, 化学调控

Abstract: In order to explore the effects of different prohexadione calcium amounts on characteristics and yield of cotton, field test was carried out, and variety of ‘Xinluzao 42’ cotton was used as experiment material. Four treatments of different prohexadione calcium amounts, including 10 g/hm2 (T1), 20 g/hm2 (T2), 30 g/hm2 (T3), 40 g/hm2 (T4) were set up, as well the commonly used chemical capping 750 g/hm2 (C), and the control sprayed with water (CK). The agronomic traits and economic traits of cotton under different treatments were detected and analyzed. The results showed that moderate dose of prohexadione calcium application had a positive regulatory affection on the improvement of cotton agronomic traits, biomass accumulation and distribution, as well as the yield and quality. The yield of seed cotton in treatment T3 and C were higher than other treatments, which increased by 11.83% and 36.32% respectively, compared with CK; their fiber length, uniformity, specific strength and elongation were also better than those of other treatments in general. In summary, spraying 30 g/hm2 of prohexadione calcium could effectively reduce plant height, increase plant biomass, single boll weight and improve fiber quality, but its affection was not better than chemical topping.

Key words: prohexadione calcium, cotton, agronomic traits, biomass, yield, chemical regulation