Abstract
Pesticide droplet is evaporating during the falling from the nozzle to the target. This dynamic evaporation is influenced by ambient temperature, relative humidity (RH), adjuvant type and concentration. In the evaporation process, the droplet size at different height is affected by the droplet evaporation. Based on this, this study determined the droplet dynamic evaporation by collecting the droplets from different height via silicone oil method with a certain temperature and RH. Eight adjuvants were chosen, including three organo-silicon, three vegetable oil and two non-ionic, with five concentrations. All droplets were generated by a droplet generator. The results showed that the type of adjuvant, ambient temperature and RH had no significant influence on droplet size generated by droplet generator. All the adjuvants in this experiment cannot reduce dynamic evaporation; Concentration of adjuvant made a difference in dynamic evaporation. This could be because of the property of adjuvant. Organo-silicon adjuvants have a negative correlation with water vapor pressure, it showed less dynamic evaporation at high temperature and RH. Vegetable oil and non-ionic adjuvant, they are the same as the controlled blank that the dynamic evaporation reduces with decreasing temperature and increasing RH. Keywords: pesticide droplet, dynamic evaporation, adjuvant, temperature, relative humidity DOI: 10.25165/j.ijabe.20201302.5353 Citation: Wang Z C, Lan L C, He X K, Herbst A. Dynamic evaporation of droplet with adjuvants under different environment conditions. Int J Agric & Biol Eng, 2020; 13(2): 1–6.
Highlights
Plant protection product (PPP) is known as the main method in plant protection, which is faster and more efficient than physical and biological methods at present
The main goal of this research is to investigate the effects of ambient temperature, relative humidity, adjuvants types and concentrations on droplets dynamic evaporation through experiments, find out the appropriate environment condition for adjuvant application and provide a reference for PPP, in unmanned aerial vehicle (UAV) spraying
100-150 cm was chosen as a stable-velocity range for testing droplets, where velocity change has less influence on investigating the relationship between ambient temperature, relative humidity, adjuvants and droplets evaporation, which could guarantee the droplets have the same time to evaporate in the air
Summary
Plant protection product (PPP) is known as the main method in plant protection, which is faster and more efficient than physical and biological methods at present. It makes PPP plays a very important role in agricultural production[1]. Evaporation speed of the pesticide droplet has a significant effect on the efficiency of pesticide: if the droplets evaporated too fast, a large quantity of solutions would evaporate during the flying process which would cause pesticide loss. High evaporation speed might cause the active ingredient of pesticide to crystallize after the droplets reached to the target[3,5], which could reduce the pesticide efficiency because the absorption of the pesticide would be almost stopped after droplet completely evaporated[6]
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