• Title/Summary/Keyword: Sprayer

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Evaluation of Exposure to Organophosphorus Pesticides According to Application Type and the Protective Equipment among Farmers in South Korea (일부 농업인에서의 농약살포방식 및 보호구 착용에 따른 유기인계 농약노출평가)

  • Lee, Jeeyoung;Roh, Sangchul
    • The Korean Journal of Pesticide Science
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    • v.20 no.2
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    • pp.172-180
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    • 2016

  • This study was conducted to evaluate the relations between the exposure level of organophosphates (OPs) pesticide and application factors among rural farmers. The urinary dialkylphosphates, metabolites of organophosphorus pesticides, including DMP, DEP, DMTP and DETP were analyzed by GC/MSD and GC/MS/MS. The DMP and DMTP were detected more in the use of a speed sprayer without cap than with a capped one. Also, the less farmers wore the personal protective equipment (PPE), the more these were detected. The amount of organophosphorus exposure was the highest in the use of a power sprayer. However, it was low when a farmer applied pesticides with a speed sprayer with cap and wore more PPE. In this study, the detection rate was analyzed by chi-square test, the exposure level of OPs was analyzed by a generalized linear model.

  • https://doi.org/10.7585/kjps.2016.20.2.172 인용 PDF KSCI

Analysis of the Flow Characteristics for the Blower According to the Blade Shape of the Electrified Speed Sprayer (전동화된 스피드 스프레이어의 블레이드 형상에 따른 송풍구 유동 특성 분석)

  • Seung Hun Oh;Jae Rok Sim;Hyun Kyu Suh
    • Journal of ILASS-Korea
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    • v.28 no.1
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    • pp.16-23
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    • 2023

  • The objective of this numerical study is to investigate the effect of the shape and material of the blower blade for the electrified speed sprayer on the blowing performance. The shape of the blade was changed to the bonding angle, the number of blades, the width of the blade, and the blade length based on the existing model. In order to obtain the reliability of the numerical model, the analysis of the grid dependence was performed in the numerical analysis. The numerical analysis results were compared and analyzed in terms of the agricultural chemical penetration length characteristics, flow uniformity characteristics, and velocity distribution characteristics. Furthermore, the effect of material change on weight reduction and structural characteristics was also compared and analyzed. As a result of the analysis, it was found that the optimal condition was that the blade angle was 45°, the number of blades was 12, and the width was 115 mm, which was confirmed through a comparison of the inlet mass flow rate. As a result of the equivalent stress lower than the yield strength due to the material change from aluminum to steel compared to the existing steel, structural defects do not appear, and it is judged that the operation time compared to the battery capacity will be improved through the weight reduction of the blade.

  • https://doi.org/10.15435/JILASSKR.2023.28.1.16 인용 PDF

Pest Control Effect and Optimal dose by Pesticide Dispersion Spray Method in the Paprika Cultivation (파프리카 시설재배지에서 약제 살포방법에 의한 해충방제 효과와 최적 살포함량)

  • Jin, Na Young;Lee, You Kyoung;Lee, Bo Ram;Jun, Jun Hack;Kim, Yu Seop;Seo, Mi Ja;Lim, Chi Hwan;Youn, Young Nam;Yu, Yong Man
    • The Korean Journal of Pesticide Science
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    • v.18 no.4
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    • pp.350-357
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    • 2014

  • We studied on pesticide residue and pest control effect when using various types of sprayers on paprika cultivation. Additionally, a test was conducted to optimize chemical content per unit area in condition of optimum pest control. Two types of sprayer were tested (three times) on paprika cultivation which was divided into seven sections. Blind spots were also examined using a water sensitive paper when spraying chemical pesticide, remote controlled sprayer were confirmed to be not effective in terms of its spraying capacity. However, a U-shaped sprayer was confirmed that it sprayed enough on all the parts of a plant in green house including the blind spots. Additionally, it does not exceed the minimum residue limits on the all parts of pesticides residue conditions. When using remote controlled sprayer, water sensitive paper were changed to blue color (82.5% and 81.2%) in terms of controlling Bemisia tabaci and Aphis gossypii based on the two spraying manners. 53.0% and 42.6% of control effect were shown on the fair parts of the plants. However, on the poor parts on which pesticides were not well-sprayed, thus, not-remained, more number of pests increased. Meanwhile, on farming that only one type of pesticide has been used, resistance pests present with very low control effect, even though sufficient amount of pesticide was well-sprayed. On the test of the optimum amount of spraying per a unit area, which shows no differences in the two cases of using 5L and 2.5L of chemical pesticides on 9 plants of paprika that has 81.8% and 84.5% control effect, respectively.

  • https://doi.org/10.7585/kjps.2014.18.4.350 인용 PDF KSCI