Field evaluation of a self‐propelled sprayer and effects of the application rate on spray deposition and losses to the ground in greenhouse tomato crops

López, Julián Sánchez-Hermosilla; Rincón, Víctor; Páez, Francisco; Agüera, Francisco Orgaz; Carvajal, F.

doi:10.1002/ps.2135

Cited by 44 publications

(47 citation statements)

References 17 publications

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“…In this last case, PI values ranged from 26.1 to 50%; this indicates that in some part of the canopy the spray liquid retained by the leaves was only a quarter of the total deposited in the external part of the canopy. This fact directly relates to the efficacy of applying a certain spray, in terms of pest/disease control, as already reported by Sánchez‐Hermosilla et al …”

Section: Discussionsupporting

confidence: 63%

“…Self‐propelled and autonomous sprayers have also attracted interest because of reduced operator exposure, improved work capacity and in some cases reduced application of PPPs while maintaining the efficacy of pest/disease control . However, problems have also been reported: poor penetration capacity exhibited by vertical boom sprayers without air assistance; management of hand‐held trolleys depending on the soil type and sprayer design; difficulties of identifying accurate conditions for safe and efficient use of self‐propelled sprayers, including aspects related to the high level of investment required …”

Section: Introductionmentioning

confidence: 99%

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Spray distribution evaluation of different settings of a hand-held-trolley sprayer used in greenhouse tomato crops

et al. 2015

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Section: Discussionsupporting

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Spray distribution evaluation of different settings of a hand-held-trolley sprayer used in greenhouse tomato crops

et al. 2015

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“…discovered that the amount of water (4.7–14.1 L ha −1 ) did not affect the efficacy of the product and advised that more acres per load be treated by reducing the spray rate. In terms of large volume ground application, Sánchez‐Hermosilla et al . reduced application volumes from 1000 to 500 L ha −1 and improved crop control product application in tomato by altering the spray gun (900 and 1800 L ha −1 ) on the vertical spray boom.…”

Section: Introductionmentioning

confidence: 99%

Field evaluation of an unmanned aerial vehicle (UAV) sprayer: effect of spray volume on deposition and the control of pests and disease in wheat

Wang

Lan

Huang

et al. 2019

Pest Management Science

155

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BACKGROUND Unmanned aerial vehicles (UAVs) are a recently developed aerial spraying technology. However, the effect of spray volume variation on deposition and pesticide control efficacy is unknown. The effect of three UAV spray volumes (9.0, 16.8 and 28.1 L ha−1) using three different nozzle sizes on droplet deposition and wheat aphid and powdery mildew control efficacy was assessed. An electric air‐pressure knapsack (EAP) sprayer was used as a comparison. RESULTS Different spray volumes significantly influenced the deposition and control efficacy of the UAV and EAP. For the UAV, a low spray volume of 9.0 L ha−1 with a fine nozzle (nozzle LU120‐01) resulted in lower deposition and control efficacy. Optimal control efficacy was achieved with coarser nozzles (nozzles LU120‐02, ‐03) at > 16.8 L ha−1 volume with systemic insecticide, and at 28.1 L ha−1 with contact insecticide and fungicide. For EAP, a high spray volume led to run‐off, and a spray volume of 225 L ha−1 achieved better deposition and control efficacy. CONCLUSION The UAV had comparable deposition and efficacy control to the EAP at a higher spray volume (> 16.8 L ha−1) with coarse nozzles, but exhibited inferior deposition and efficacy control at a lower spray volume (<9.0 L ha−1) with fine nozzles. © 2019 Society of Chemical Industry

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“…In several studies the values of d v and  have been calculated in a greenhouse tomato crops (Cerruto et al, 2009a, b;Sánchez-Hermosilla et al, 2011, as indicated in Table 3. In consideration of these values, our proposal is to use a value of 1.5 µL cm -2 d v and, for the spray fraction deposited on the canopy () 0.50 for spray-gun applications or 0.75 for spray boom applications.…”

Section: Development Of the Model To Estimate The Laimentioning

confidence: 99%

Volume application rate adapted to the canopy size in greenhouse tomato crops

López

Páez

Rincón

et al. 2013

Sci. agric. (Piracicaba, Braz.)

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The application rate of plant-protection products is indicated as a concentration or amount of product per area. Greenhouse crops grow swiftly, and an application rate based on a fi xed amount of product per hectare can result either in large losses and overdoses when the plants are small or to be insuffi cient when the plants are fully developed. To solve these problems, the application rates of plant-protection products need to be adapted to the plant mass present in the greenhouse when the spray is applied. Two models were developed to estimate the leaf area based on easily measured geometric data of the vegetation in a greenhouse tomato crop.The model based on the PRV (Plant Row Volume) had that best results. The calculation of the volume application rate from the PRV has resulted in a reduction of more than 30 % of the quantity of plant protection product sprayed, without decreasing yield. The PRV of a greenhouse tomato (Lycopersicon esculentum Mill.) is an easily measured parameter that enables the estimation of the leaf area index and the use of application strategies adapted to the changes in the plant canopy, saving major amounts of plant protection product used, compared to the conventional system.

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Field evaluation of a self‐propelled sprayer and effects of the application rate on spray deposition and losses to the ground in greenhouse tomato crops

Abstract: The vertical spray booms used in tomato crops improve the application of plant protection products with respect to the spray gun, reducing the application volumes and the environmental risks of soil pollution.

Cited by 44 publications

References 17 publications

Spray distribution evaluation of different settings of a hand-held-trolley sprayer used in greenhouse tomato crops

Spray distribution evaluation of different settings of a hand-held-trolley sprayer used in greenhouse tomato crops

Field evaluation of an unmanned aerial vehicle (UAV) sprayer: effect of spray volume on deposition and the control of pests and disease in wheat

Volume application rate adapted to the canopy size in greenhouse tomato crops

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