Study on the Capping Effect of Different Concentrations of Capping Agent on Cotton by Fly Spraying
A study was conducted on the capping effect of different concentrations of composite capping agents on cotton.The results showed that the plant height,plant width,number of fruit stands,number of internodes on the main stem,and average LAI of the high concentration treatment decreased by 2.76%,5.89%,6.37%,7.77%,and 0.61% compared to the medium concentration,decreased by 11.85%,9.78%,16.94%,18.68%,and 6.25% compared to the lower concentration.The average SPAD value and single leaf Pn of high concentra-tion treatment increased by 6.49% and 4.46% compared to medium concentration treatment,while the lower concentration treatment increased by 12.47% and 17.51%;The dry matter accumulation in stems and leaves of low concentration treatments was significantly higher than that of medium and high concentration treatments,and the dry matter accumulation in reproductive organs and final yield were significantly lower than those of medium and high concentration treatments.Moreover,there was no significant difference between medium and high concentration treatments.Drone spraying of 1 200-1 500 mL/hm2 of meperidium water solution with 300-375 g/hm2 of uniconazole and 40-47.5 mL/hm2 of methyl oleate can effectively control plant type and increase yield.
万方数据
维普
