Surface tension and spreading coefficient of single-and mix-pesticide solutions with aerial spraying organosilicone adjuvant
Abstract
Abstract: Recently, unmanned aerial vehicles (UAVs) have been widely used to spray pesticides to control diseases and pests of many crops. During the process of pesticide application by UAV spraying, aerial spraying tank-mix adjuvants are usually mixed with pesticide solution to improve the efficiency of pesticides. Preventing pesticides depositing in off-target area is important in enhancing pesticide utilization. Improving the wetting and spreading of pesticides is one of the most important ways to reduce pesticide droplets running off from the target. This study is focusing on the effects of aerial spraying tank-mix organosilicone adjuvant (OA) on surface tension and spreading coefficient of pesticide solutions. Six pesticide solutions used alone and mixed together of different concentrations are prepared under field application conditions. Surface tension and spreading coefficient of the solution with and without OA were measured, respectively. The results show that OA could significantly lower surface tension and increase spreading coefficient of pesticide solutions regardless of solution concentrations. OA with concentration higher than critical micelle concentration (CMC) could not further decrease surface tension, but still could significantly increase spreading coefficient of the solution. For solutions with single pesticide belongs to different formulations, the minimum needed concentration of OA is different due to formulation type. The minimum concentration of OA for solution of suspension concentrate and aqueous solution (0.5‰-0.7‰) is lower than that of solutions of emulsifiable concentrate (EC) (2.0‰-5.0‰). For solutions of several pesticides mixed together, the minimum concentration of OA is related to the number of EC formulation in the solution. For pesticide solutions containing one EC formulation, the minimum concentration of OA is 2.0‰; for pesticide solutions containing two or three EC formulation, the minimum concentration of OA is recommended to be 5.0‰-10.0‰. These results suggest that the concentration of OA needed for pesticide solution should be evaluated before field application considering pesticide belonging to different formulations mixing together for application.
Keywords: aerial spraying adjuvant, organosilicone, surface tension, spreading coefficient
DOI: 10.33440/j.ijpaa.20210401.159
Citation: Meng Y H, Wang M M, Wang Z G, Hu H Y, Ma Y. Surface tension and spreading coefficient of single-and mix-pesticide solutions with aerial spraying organosilicone adjuvant. Int J Precis Agric Aviat, 2021; 4(1): 6–13.
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Zhao X, Cui H, Wang Y, et al. Development strategies and prospects of nano-based smart pesticide formulation. Journal of Agricultural Food Chemistry, 2017. doi: 10.1021/acs.jafc.7b02004.
Zhang H, Lu J, Wei D, et al. Wetting state and dynamic spreading behavior of alkyl polyglycoside drop on cucumber leaf surface. Transactions of the Chinese Society of Agricultural Engineering, 2017, 33(3): 81–87. doi: 10.11975/j.issn.1002-6819.2017.03.011. (in Chinese with English abstract)
Adriano A M, Jaime U, Jerson V C G, et al. Impact of tank-mix adjuvants on deposit formation, uticular penetration and rain-induced removal of chlorantraniliprole. Crop Protection, 2015, 78: 253–262. doi: 10.1016/j.cropro.2015.09.021.
Evandro P P, Carlos G R, Dal P M, et al. Effects of agricultural spray adjuvants in surface tension reduction and spray retention on Eucalyptus leaves. African Journal of Agricultural Research, 2016, 11(40). doi: 10.5897/ajar2016.11349.
Tang X L, Dong J, Li X F, et al. A comparison of spreading behaviors of Silwet L-77 on dry and wet lotus leaves. Journal of Colloid & Interface Science, 2008, 325(1): 223–227. doi: 10.1016/j.jcis.2008.05.055.
Castro E B, Carbonari C A, Velini E D, et al. Influence of Adjuvants on the Surface Tension, Deposition and Effectiveness of Herbicides on Fleabane Plants. Planta Daninha, 2018, 36. doi: 10.1590/ s0100-83582018360100067.
Jank? J, Bartovská L, Soukup J, Jursík M, Hamouzová K. Density and surface tension of aqueous solutions of adjuvants used for tank-mixes with pesticides. Plant Soil Environment, 2012, 58(12): 568–572. doi: 10.1016/j.cropro.2012.05.009.
Santos C A M D, Santos R T D S, Della'Vechia J F, et al. Effect of addition of adjuvants on physical and chemical characteristics of Bt bioinsecticide mixture. Nature-Scientific Reports, 2019. doi: 10.1038/s41598-019-48939-y.
Hazen J L. AdjuvantsTerminology, Classification, and Chemistry. Weed Technology, 2000, 14(4): 773–784. doi: 10.1614/0890-037X(2000) 014[0773:ATCAC]2.0.CO;2.
Stevens P J G. Organosilicone surfactants as adjuvants for agrochemicals. Pestic. Sci, 1993, 38(2-3): 103–122.
Singh M, Mack E R. Effect of organosilicone-based adjuvants on herbicide efficacy. Pestic. Sci, 1993, 38: 219–225. doi: 10.1002/ ps.2780380217.
Huang L X, Hao L F, Yuan J M, et al. Research progress on preparation and application of silicone surfactants for pesticide adjuvants. Silicone Material, 2010, 24(1): 59–64. (in Chinese with English abstract)
Meng Y, Lan Y, Mei G, et al. Effect of aerial spray adjuvant applying on
the efficiency of small unmanned aerial vehicle on wheat aphids control. International Journal of Agricultural and Biological Engineering, 2018, 11(5): 46–53. doi: 10.25165/j.ijabe.20181105.4298.
Qin W C, Qiu B J, Xue X Y, et al. Droplet deposition and control effect of insecticides sprayed with an unmanned aerial vehicle against plant hoppers. Crop Protection, 2016, 85: 9–88. doi: 10.1016/ j.cropro.2016.03.018.
He X K, Bonds J, Herbst A, et al. Recent development of unmanned aerial vehicle for plant protection in East Asia. International Journal of Agricultural and Biological Engineering, 2017, 10(3): 18–30. doi: 10.3965/j.ijabe.20171003.3248.
Lan Y, Chen S D, Fritz, B.K. Current status and future trends of precision agricultural aviation technologies. International Journal of Agricultural and Biological Engineering, 2017, 10: 1–17. doi: 10.3965/ j.ijabe.20171003.3088.
He Y, Wu J, Fang H, et al. Research on deposition effect of droplets based on plant protection unmanned aerial vehicle: A review. Journal of Zhejiang University (Agric. & Life Sci.), 2018, 44(4): 392–398. (in Chinese with English abstract)
Meng Y H, Su J Y, Song J L, et al. Experimental evaluation of UAV spraying for peach trees of different shapes: Effects of operational parameters on droplet distribution. Computers and Electronics in Agriculture, 2020, 170. doi: 10.1016/j.compag.2020.105282.
Wang S L, Song J L, He X K, et al. Performances evaluation of four typical unmanned aerial vehicles used for pesticide application in China. International Journal of Agricultural and Biological Engineering, 2017, 10(4): 22–31. doi: 10.25165/j.ijabe.20171004.3219.
Wang X N, He X K, Song J L, et al. Drift potential of UAV with adjuvants in aerial applications. International Journal of Agricultural and Biological Engineering, 2018, 11(5): 54–58. doi: 10.25165/ ijabe.v11i5.3185.
Hunter J E, Gannon T W, Richardson R J, et al. Coverage and drift potential associated with nozzle and speed selection for herbicide applications using an unmanned aerial sprayer. Weed Technology, 2019, 34(2): 235–240. doi: 10.1017/wet.2019.101.
He L, Hu T, Meng Y H, et al. Influences of spray adjuvants and spray volume on the droplet deposition distribution with unmanned aerial vehicle (UAV) spraying on rice. Plan Protection, 2017, 44(6): 1046–1052. doi: 10.13802/j.cnki.zwbhxb.2017.2016147. (in Chinese with English abstract)
Gu Z Y, Xu X L, Han L J. Study on the Function of Surfactant in the Application of Pesticides. Modern Agrochemicals, 2003, 2(4): 41–42. (in Chinese with English abstract)
Zhang L N, Yang D B, Yuan H Z. Preparation and performance analysis of pesticide droplet wettability test cards. Plant Protection, 2012, 38(2): 103–107. doi: 10.3969/j.issn.0529-1542.2012.02.021. (in Chinese with English abstract)
Gu Z Y, Xu X L, Han L J. Study on the method of measure of the critical surface tension of plants. Modern Agrochemicals, 2002, (2): 18–20. (in Chinese with English abstract)
Wang X N, Liu Y P, Wang S W, et al. Effects on wettability of 10% difenoconazole water dispersible granule with adjuvants on litchi leaves. Chinese Journal of Pesticide Science, 2018, 20(6): 803–808. (in Chinese with English abstract)
Wang B, Song J L, Zeng A J, et al. Effects of formulations and surfactants on the behavior of pesticide liquid spreading in the plant leaves. Chinese Journal of Pesticide Science, 2012, 14(3): 334–340. (in Chinese with English abstract)
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