Effects of different spraying machinery and pesticide combination on the defoliation,the ripeness,yield and quality of cotton
[Objective]To study the effects of spraying machinery and pesticide combination on cotton defoliation,ripeness,yield and quality,in the hope of providing reference for the rational use of UAV defoliant for improving the quality and efficiency of machine-picked cotton.[Methods]Experiments on the different spraying machines to spray cotton defoliation were carried out,different machine types,chemical combinations and other treatments were set up to analyze the differences in cotton defoliation rate,branch hanging rate,boll opening rate,etc.[Results]Under the same agent treatment,the elongation rate and branch hanging rate were shown as DJI T16 UAV>DJI T16 UAV>Locomotive DFH LX2204 and in terms of boll number per plant,lint,yield Micronaire value and elongation at break were XAG P30 UAV>DJI T16 UAV>Locomotive DFH LX2204.After adding the same anti-flying adjuvant,the defoliation rate,flocculation rate,boll number per plant and yield were all the same as those of XAG P30 UAV>DJI T16 UAV>Locomotive DFH LX2204,branch hanging rate,uniformity index and the fracture strength were shown as DJI T16 UAV>XAG P30 UAV>Locomotive DFH LX2204.Different UAV types T2 treatment(XAG P30 UAV+Zhenling+Auxiliary+Ethephon+Bedaton+CAU specific agent)and T5 treatment(DJI T16 UAV+Rettolone+Aviation+Ethephon+Bedaton)did the best.When it came to 20 days after spraying,the defoliation rate of T2 treatment and T5 treatment was 1.97%and 1.41%higher than that of the Locomotive spraying,and the flocculation rate was slightly lower by 0.51%and 1.52%,respectively;T2 treatment had the highest yield,and the seed cotton yield were 25.56%and 25.22%higher than that of locomotive spraying;the quality were better,while the av-erage length,uniformity index and elongation of the upper half were 1.77%,2.23%and 3.34%lower than those of Locomotive spraying.The breaking strength and Micronaire value were 1.95%and 1.99%higher than those of the locomotive.[Conclusion]Both kinds of defoliant combination sprayed by UAV can achieve better defoliation and ripening effect than that of Locomotive,slightly higher cotton yield than that of Locomotive,and improve some fiber quality parameters.In comprehensive consideration,T2 and T5 treatment are recommended to be popularized and applied in field mechanical cotton harvesting.
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