Effect of Angle of Sprayer Deflector on Spray Distribution in Dwarf Apple Trees

Çelen, İlker Hüseyin

doi:10.3923/ja.2008.206.208

Cited by 5 publications

(2 citation statements)

References 5 publications

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“…Na determinação do tamanho das gotas, utilizaram-se etiquetas hidrossensíveis posicionadas no plano horizontal da planta, nas posições (norte, sul, leste e oeste), em três alturas do dossel (inferior, mediana e superior) e três profundidades na copa (externa, mediana e interna) (Figura 1). Esta metodologia também foi utilizada por Celen (2008).…”

Section: Vc IV Vp =unclassified

Déficit de pressão de vapor d água no ar na distribuição de líquido utilizando um pulverizador hidropneumático

Alvarenga¹,

Teixeira²,

Cecon³

et al. 2013

RCA

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RESUMO: A pulverização de agrotóxicos exige conhecimento das condições meteorológicas antes, durante e após as operações no campo. Deste modo, objetivou-se com este trabalho avaliar a influência do déficit de pressão de vapor d'água no ar, nos parâmetros da pulverização produzidos pela ponta de jato cônico vazio JA-2, na cultura da laranja. A pulverização foi realizada utilizando-se um pulverizador hidropneumático. A análise das gotas foi realizada por meio do analisador de partículas a laser e das etiquetas hidrossensíveis. Para a determinação do volume de calda, empregou-se o método do volume de copa baseado nas dimensões das árvores no talhão. Na seleção do índice volumétrico, considerou-se o volume da copa e o histórico de volume de calda pulverizado na área, sendo adotado 50 mL m -3 . O volume de calda pulverizado foi de 696 L ha -1 . O experimento foi montado no delineamento em blocos casualizados com três tratamentos e três repetições. A maior percentagem de cobertura do alvo foi de 33% no intervalo de déficit de pressão de vapor d'água no ar de 1,38 a 1,45 kPa. A maior densidade de gotas foi de 341 gotas cm -2 , no intervalo de déficit de pressão de vapor d'água no ar de 2,10 a 2,17 kPa. A maior deposição da calda sobre as folhas foi de 2,6 µL cm -2 , observados no déficit de pressão de vapor de 0,76 a 0,86 kPa.ABSTRACT: Spraying of pesticides requires knowledge of weather conditions prior to, during and after operations in the field. Thus, the objective of this study was to evaluate the influence of vapor pressure deficit in the air on the spraying parameters generated by the hollow cone nozzle JA-2 on orange trees. Spraying was performed using a hydropneumatic sprayer. Analysis of spray drops was performed using a laser particle analyzer and watersensitive paper. To determine spray volume, the volume overlap method was used based on the dimensions of the trees in the plantation. For selecting volume index, the crown volume and history of volume sprayed on the area were considered adopting a volume of 50 mL m -3 . The total volume sprayed was 696 L ha -1 . The experiment was arranged in a randomized block design with three treatments and three replications. The highest percentage of target coverage was 33% in the interval for vapor pressure deficit in the air between 1.38 and 1.45 kPa and the highest droplet density was 341 drops cm -2 for vapor pressure deficit in the air ranging from 2.10 to 2.17 kPa. The highest solution deposition on leaves was 22.6 µL cm -2 , observed for the vapor pressure deficit ranging from 0.76 to 0.86 kPa.

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Section: Vc IV Vp =unclassified

Déficit de pressão de vapor d água no ar na distribuição de líquido utilizando um pulverizador hidropneumático

Alvarenga¹,

Teixeira²,

Cecon³

et al. 2013

RCA

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“…With this testing, the goal is to calibrate vertical liquid distribution to provide the necessary leaf area coverage [4]. Also, it is necessary to carry out field tests of vertical liquid distribution, so that we can point out the nozzles toward the geometry of plantation or to study the best nozzle angles for optimal leaf area coverage [5]. Axial fan sprayers have a vertical liquid distribution in the form of a vertical sinusoid.…”

Section: Introductionmentioning

confidence: 99%

Impact of technical spraying factors on vertical liquid distribution with Agromehanika AGP 440 axial fan sprayer

et al. 2015

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Original scientific paper The influence of technical spraying factors on vertical distribution of liquid and air velocity was observed and measured with vertical patternator device. In research, Lechler yellow (TR 8002C) and red (TR 8004C) nozzles are used with two different sets of fan rotor blades (two different air velocities) at 540 rpm of PTO. The research was set as controlled three -factorial experiment (without the influence of weather factors) with 8 treatments in 4 repetitions, for each side of Agromehanika AGP 440 axial fan sprayer. Technical spraying factors (ISO nozzle number, settings of fan blades and spraying height) have a high significant impact (**) on the main properties of the research (vertical distribution of liquid and air velocity). By decreasing the ISO nozzle number and air velocity the increase of liquid deposit is found on vertical patternator and with the increase of measuring height a non-uniform distribution of liquid and air velocity is found. In addition, a non-uniform distribution of liquid and air velocity is established between the left and right sides of the machine. With regression analysis between the vertical distribution of liquid and air velocity on both sides of the machine, a statistically significant coherence is determined (left side of the machine: r = 0,96; p < 0,01; right side of the machine: r = 0,97; p < 0,01). Keywords: air velocity; axial fan sprayer; nozzle; vertical liquid distribution; vertical patternator Utjecaj tehničkih čimbenika raspršivanja na vertikalnu raspodjelu tekućine s raspršivačem Agromehanika AGP 440Izvorni znanstveni članak Istražuje se utjecaj tehničkih čimbenika raspršivanja na vertikalnu raspodjelu tekućine i brzine zraka, mjerenu s uređajem vertikalnim peternatorom. Koriste se žute (TR 8002C) i crvene (TR 8004C) Lechler mlaznice te dva različito podešena zakošenja lopatica rotora ventilatora (dvije različite brzine zračne struje) pri 540 o/min PVT-a. Istraživanje se postavlja kao kontrolirani trofaktorijalni pokus (bez utjecaja vremenskih čimbenika) sa 8 tretmana u 4 ponavljanja, za obje strane nošenog aksijalnog raspršivača Agromehanika AGP 440. Tehnički čimbenici raspršivanja (ISO broj mlaznice, podešavanje lopatica ventilatora i visina raspršivanja) ostvaruju vrlo značajan utjecaj (**) na glavna svojstva istraživanja (vertikalna distribucija tekućine i brzine zračne struje). Smanjivanjem ISO broja mlaznice i smanjivanjem brzine zračne struje povećava se količina tekućine deponirana na vertikalnom paternatoru, te povećavanjem visine mjerenja na vertikalnom paternatoru dolazi do neuniformne raspodjele tekućine i brzine zračne struje. Uz navedeno, utvrđuje se neuniformna raspodjela količine tekućine i brzine zračne struje između lijeve i desne strane stroja. Regresijskom analizom između vertikalne raspodjele količine tekućine i brzine zraka s obje strane stroja utvrđuje se visoka statistički značajna povezanost (lijeva strana stroja: r = 0,96; p < 0,01; desna strana stroja: r = 0,97; p < 0,01).

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Dynamic evaluation of airflow stream generated by a reverse system of an axial fan sprayer using 3D-ultrasonic anemometers. Effect of canopy structure

Salcedo

Pons

Casamada

et al. 2019

Computers and Electronics in Agriculture

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Air assisted sprayers are currently used for the applications of plant protection products in fruit trees and vineyards. However, the use of these equipment carries a high environmental risk, mainly owing to the generation of airborne spray drift in the lower boundary layer above crop canopy. Hence, many tests are currently focused on investigating several factors that affect the efficiency of the spray process, in which air assistance and air behaviour are two of the most difficult parameters to evaluate. This present work proposes a first approach on the characterization of the airflow generated

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Effect of Angle of Sprayer Deflector on Spray Distribution in Dwarf Apple Trees

Cited by 5 publications

References 5 publications

Déficit de pressão de vapor d água no ar na distribuição de líquido utilizando um pulverizador hidropneumático

Déficit de pressão de vapor d água no ar na distribuição de líquido utilizando um pulverizador hidropneumático

Impact of technical spraying factors on vertical liquid distribution with Agromehanika AGP 440 axial fan sprayer

Dynamic evaluation of airflow stream generated by a reverse system of an axial fan sprayer using 3D-ultrasonic anemometers. Effect of canopy structure

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