Effects of alkyl ethyl sulfonate dosage on cotton defoliation efficacy sprayed by UAV

Qinggang Xiao, Rui Du, Tingting Zhou, Xiaoqiang Han, Guobin Wang, Wei Fu

Abstract


Abstract: As a new low volume sprayer, unmanned aerial vehicle (UAV) application is developing quickly worldwide.  Alkyl ethyl sulfonate soluble concentrate is a kind of spray adjuvants for defoliants, which is widely used in cotton defoliant application.  The aim of this study was to compare the droplet deposition, defoliation and boll opening of a UAV added with six dosages of alkyl ethyl sulfonate on the cotton.  Addition with 4.2 g a.i./hm2 (one-sixtieth of the recommended dosage in the field) alkyl ethyl sulfonate could significantly increase the droplets coverage rate, and improve defoliation and boll opening effects.  Added with lower dosage alkyl ethyl sulfonate (4.2 g a.i./hm2 and 8.4 g a.i./hm2), the droplet distribution uniformity was much better than that of moderate (84 g a.i./hm2) and high dosage (252 a.i./hm2) of alkyl ethyl sulfonate.  It could not only ensure the effects of defoliation and boll opening, but also reduce the environmental pollution by alkyl ethyl sulfonate.

Keywords: defoliant, alkyl ethyl sulfonate dosage, droplet deposition, unmanned aerial vehicle

DOI: 10.33440/j.ijpaa.20190202.33.

 

Citation: Xiao Q G, Du R, Zhou T T, Han X Q, Wang G B, Fu W.  Effects of alkyl ethyl sulfonate dosage on cotton defoliation efficacy sprayed by UAV.  Int J Precis Agric Aviat, 2019; 2(2): 67–75.


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