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Effect of Aviation Spray Adjuvants on Defoliant Droplet Deposition and Cotton Defoliation Efficacy Sprayed by Unmanned Aerial Vehicles

1
Key Laboratory of Oasis Agricultural Pest Management and Plant Protection Resources Utilization, College of Agriculture, Shihezi University, Shihezi 832002, China
2
College of Mechanical and Electrical Engineering, Shihezi University, Shihezi 832002, China
3
National Center for International Collaboration Research on Precision Agricultural Aviation Pesticide spraying Technology (NPAAC), College of Engineering, South China Agricultural University, Guangzhou 510642, China
4
College of Mechanical and Electrical Engineering, Hainan University, Haikou 570228, China
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Agronomy 2019, 9(5), 217; https://doi.org/10.3390/agronomy9050217
Received: 10 April 2019 / Revised: 22 April 2019 / Accepted: 28 April 2019 / Published: 29 April 2019
(This article belongs to the Section Farming Sustainability)
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PDF [3123 KB, uploaded 29 April 2019]
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Abstract

Defoliant spraying is an important aspect of mechanized cotton harvesting. Fully and uniformly spraying defoliant could improve the quality of defoliation and reduce the impurity content in cotton. Improving the coverage of defoliant droplets in the middle and lower layers of cotton and ensuring the full and even dispersion of droplets in the cotton canopy are essentially in increasing the defoliation effect. In this study, we assessed the effect of aviation spray adjuvants on droplet deposition, defoliation, boll opening and defoliant retention in cotton leaves sprayed by an unmanned aerial vehicle (UAV). The results showed that adding aviation spray adjuvants could significantly improve the defoliant droplet deposition. Fifteen days after spraying, the defoliation rate was 80.31% and the boll opening was 90.61%. The defoliation rate increased by 3.12–34.62% and the boll opening rate increased by 6.67–29.56% after the addition of aviation spray adjuvants. Using a vegetable oil adjuvant could significantly increase the droplet coverage rate and the retention of defoliants in cotton leaves. View Full-Text
Keywords: aviation spray adjuvants; droplet deposition; cotton defoliants; unmanned aerial vehicles aviation spray adjuvants; droplet deposition; cotton defoliants; unmanned aerial vehicles
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Xiao, Q.; Xin, F.; Lou, Z.; Zhou, T.; Wang, G.; Han, X.; Lan, Y.; Fu, W. Effect of Aviation Spray Adjuvants on Defoliant Droplet Deposition and Cotton Defoliation Efficacy Sprayed by Unmanned Aerial Vehicles. Agronomy 2019, 9, 217.

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