Abstract
The addition of surfactants to pesticide spray applications is an important method to improve the spray atomization and the coverage of droplets on the target. The effects of different types of surfactants on spraying have been extensively studied, but there have been few studies on the commonly used surfactant polyethylene glycol so far. This article compares the effect of polyethylene glycol 20,000 on the atomization and deposition characteristics by measuring the droplet size and the deposition on the polyethylene collection line when spraying different concentrations of polyethylene glycol 20,000 solution. The results show that the volume medium diameter DV0.5 of spraying different concentrations of polyethylene glycol 20,000 solution is larger than that of clear water, and that as the concentration increases, the volume medium diameter DV0.5 gradually increases but ΦVol < 150 μm decreases. Spraying different concentrations of polyethylene glycol 20,000 solution at a horizontal distance of 2–7 m from the nozzle and at a distance of 0.1–0.2 m from the bottom of the floor, the depositions are all less than that of clear water, and as the concentration increases, the deposition becomes smaller. This article can provide theoretical support for the use and concentration ratio of polyethylene glycol 20,000 in field application.
Highlights
The use of chemical pesticides is currently one of the main methods in plant protection operations to control crop diseases and insect pests
The addition of surfactants can reduce the surface tension of the liquid, enhance the degree of atomization, and the droplet size should become smaller. It can be seen from the above research that when the spraying medium is a mixture of polyethylene glycol (PEG)-20,000 with different concentrations and clear water, the droplet size increases significantly and is directly proportional to the concentration
This article comprehensively compares the effects of spraying clear water and different concentrations of PEG-20,000 solution on the droplet size, distribution and deposition characteristics of the fan nozzle Teejet 80-03 VP
Summary
The use of chemical pesticides is currently one of the main methods in plant protection operations to control crop diseases and insect pests. Surfactant is a substance added in the pesticide spraying process, which can improve the physical properties and atomization performance of the pesticide liquid, thereby increasing the deposition of droplets on the target and the utilization rate of the pesticide. The degree of pesticide atomization directly affects the deposition effect of the chemical solution on the target and the drift of the non-target area [4,5,6,7], which in turn affects the control effect of pesticides on pests and diseases [8,9,10]. Smaller droplets are more likely to evaporate and drift due to their low mass and large air resistance [12,13], but small droplets help to improve the coverage and uniformity of the pesticide solution on the target
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