Abstract
Plant protection unmanned aerial vehicles (UAVs) consist of light and small UAVs with pesticide spraying equipment. The advantage of UAVs is using low-volume spray technology to replace the traditional large-volume mass locomotive spray technology. Defoliant spraying is a key link in the mechanized cotton harvest, as sufficient and uniform spraying can improve the defoliation quality and decrease the cotton trash content. However, cotton is planted at high density in Xinjiang, with leaves in two adjacent rows seriously overlapped, making the lower leaves poorly sprayed. Thus, the defoliation effect is poor, and the cotton quality is degraded. To improve the effect of defoliation and reduce the losses caused by boom sprayer rolling, the effect of defoliant dosage on defoliation, boll opening, absorption and decontamination in cotton leaves and the effect of spraying volume on absorption and decontamination in cotton leaves sprayed by UAVs are studied. The pooled results indicate that plant protection UAVs could be used for cotton defoliants spraying with a twice defoliant spraying strategy, and the defoliant dosage has no significant effect on seed cotton yield and fiber quality in Xinjiang. The residue of thidiazuron in cotton leaves reaches the maximum at four days after spraying, the residue of diuron in cotton leaves reaches the maximum at one day after second spraying. The thidiazuron and diuron residues are increased with spraying volume at rang of 17.6–29.0 L/ha. When the spraying volume is less than 17.6 L/ha, the residue of thidiazuron and diuron is reduced. The research results could provide a reference for further optimization of the spraying parameters of cotton defoliant by plant protection UAVs.
Highlights
Cotton (Gossypium hirsutum L.) is an important commercial crop worldwide, and serves as a significant source of fiber, feed, foodstuff, oil and biofuel [1,2]
The authors report this study’s results concerning the effect of defoliant dosage on defoliation, volume on absorption andand decontamination in cotton leaves sprayed by effect plant protection to boll opening, absorption decontamination in cotton leaves and the of sprayingUAVs, volume obtain the optimized parameters for in thecotton working of unmanned aerial vehicles (UAVs), references and to bases for on absorption and decontamination leaves sprayedand by provide plant protection
Analysis of variance in relation to cotton parameters among defoliation efficacy and defoliant dosage is presented in Efficacy began to form at four days after spraying, and the dose had a great
Summary
Cotton (Gossypium hirsutum L.) is an important commercial crop worldwide, and serves as a significant source of fiber, feed, foodstuff, oil and biofuel [1,2]. Most cotton pesticide operations are carried out using large-volume ground machinery in Xinjiang, which results in rolling the cotton plant, hitting the bolls, pulling the cotton branch, hitting the opened balls off, water and pesticide wastage, and reduces the yield and quality of cotton. Diuron accelerates the scorch of cotton leaves, improves defoliation under low temperature conditions [14] These types of defoliants induce drastic leaf abscission which inhibits timely transport of nutrients from leaves to cotton bolls. The authors report this study’s results concerning the effect of defoliant dosage on defoliation, volume on absorption andand decontamination in cotton leaves sprayed by effect plant protection to boll opening, absorption decontamination in cotton leaves and the of sprayingUAVs, volume obtain the optimized parameters for in thecotton working of UAVs, references and to bases for on absorption and decontamination leaves sprayedand by provide plant protection. The optimized parameters for the working of UAVs, and provide references and bases for further improving the cotton defoliant spraying technique
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