不同剂量的氟节胺与缩节胺对棉花株型结构的影响

【目的】 分析比较不同剂量氟节胺和缩节胺复配使用对棉花株型结构的影响,为机采棉中后期化学调控提供理论依据。【方法】 选用棉花生产上使用的氟节胺和缩节胺2种植物生长调节剂,分别于棉花盛蕾期、初花期、打顶期进行施药,以人工打顶为对照组。【结果】 第1次喷施氟节胺和缩节胺后,棉花株高增长量在15.00~27.00 cm,除氟节胺300 g/hm²+缩节胺30 g/hm²、氟节胺300 g/hm²+缩节胺50 g/hm²、氟节胺600 g/hm²+缩节胺30 g/hm²外,其他处理缩短约4.89~12.43 cm(P<0.05)。第2次施药后,棉花株高增长量在2.00~7.59 cm,氟节胺300 g/hm²+缩节胺30 g/hm²、氟节胺300 g/hm²+缩节胺50 g/hm²、氟节胺600 g/hm²+缩节胺50 g/hm²处理的棉花株高增长3.08~4.69 cm(P<0.05)。第3次施药后,各处理与人工打顶的棉花株高基本不再增加。当氟节胺600 g/hm²、900 g/hm²、1 500 g/hm²+缩节胺70 g/hm²时,棉花有效果枝数增加7.75%~10.64%。经氟节胺和缩节胺处理,棉花倒1至倒3果枝枝长平均减少了8.23~9.68 cm,并且与人工打顶差异显著(P<0.05)。喷施氟节胺与缩节胺,棉株上部铃增加19.72%~71.85%,而中部铃只有在氟节胺浓度为600、900和1 500 g/hm²时增加5.71%~32.65%。【结论】 氟节胺与缩节胺复配使用后,可有效控制棉花株高,且2种药剂复配浓度较高时能更好的优化群体结构。

Effects of Different Doses of Flumetralin and DPC on Plant Type Structure of Cotton

【Objective】 To analyze and compare the effects of different doses of flumetralin and DPC on the plant type structure of machine-harvesting cotton, and provide a theoretical basis for the chemical regulation in the middle and late stages of cotton.【Method】 In this paper, two plant growth regulators, flumetralin and DPC used in cotton production were selected and applied at the bud stage, the initial flowering stage and the topping stage of cotton with the artificial detopping cotton as a control group.【Result】 The results showed that after spraying flumetralin and DPC for the first time, the growth amount of cotton plant height was between 15.00 cm and 27.00 cm. Except the treatment groups such as flumetralin 300 g/hm² + DPC 30 g/hm²、 flumetralin 300 g/hm² + DPC 50 g/hm² and flumetralin 600 g/hm² + DPC 30 g/hm², the growth amount of cotton plant height of other treatments were shortened by about 4.89-12.43 cm (P<0.05). After the second application of these two drugs, the growth amount of cotton plant height was between 2.00 cm and 7.59 cm, The plant height growth of cotton treated with flumetralin 300 g/hm² + DPC 30 g/hm², flumetralin 300 g/hm² + DPC 50 g/hm², and flumetralin 600 g/hm²+ DPC 50 g/hm², increased by 3.08-4.69 cm (P<0.05). After the third application of these two drugs, the cotton plant height of each treatment and artificial topping did not increase substantially.When flumetralin was 600, 900, 1,500 g/hm² + DPC 70 g/hm², the number of effective branches of cotton increased by 7.75%-10.64%. When machine-harvesting cotton was sprayed with flumetralin 600, 900, 1 500 g/hm² + DPC 70g/hm², the number of cotton effective fruit branches increased by 7.75%-10.64%, However the average length of first fruit branch, top 2nd fruit branch, top 3rd fruit branch decreased by 8.23-9.68 cm (P<0.05). Spraying flumetralin and DPC, the upper boll of the cotton plant increased by 19.72%-71.85%, while the central boll increased by 5.71%-32.65% only when the concentrations of flumetralin were 600, 900, 1,500 g/hm². When machine-harvesting cotton was sprayed with flumetralin and DPC, the upper cotton bolls increased by 19.72%-71.85%, while the central cotton bolls increased by 5.71%-32.65% only when the concentrations of flumetralin were 600, 900, 1,500 g/hm².【Conclusion】 After application flumetralin and DPC, the plant height can be effectively controlled, and when the concentrations of the two agents are higher, the population structure can be better optimized.