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

Casamada, Jordi Llop; Gil, Emilio; Gallart, Montserrat; Contador, Felipe; Ercilla, Mireia

doi:10.1002/ps.4014

Cited by 28 publications

(23 citation statements)

References 23 publications

(55 reference statements)

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“…For the cucumber crop, the depositions on the internal leaves in the middle and bottom of the canopy were 17 and 37% higher for the AAE sprayer than for the BP sprayer, respectively. These results are in concordance with those obtained by Llop et al ., who concluded that a sprayer equipped with air assistance improved the depositions on leaves and increased penetrability into the canopy.…”

Section: Resultssupporting

confidence: 93%

“…and Cho et al ., about 30 to 35% of yield losses can be prevented by applications of pesticides. However, because of the limitations of the greenhouse's structure and operational space, pest management in greenhouses is a challenge, and handheld and knapsack sprayers are still widely used . In China and many other developing countries, the PPPs are normally sprayed using low‐technology manual systems, which are difficult to regulate as the spray quality depends mainly on the skill of the operator .…”

Section: Introductionmentioning

confidence: 99%

“…Air assistance has been considered to be one of the most important elements to improve the effectiveness of spray application, especially for dense crops . Llop et al . found that flat‐fan nozzles with air assistance increased deposition on tomato leaves and penetrability into the canopy in a greenhouse.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Comparison of a new air‐assisted sprayer and two conventional sprayers in terms of deposition, loss to the soil and residue of azoxystrobin and tebuconazole applied to sunlit greenhouse tomato and field cucumber

Pan

et al. 2017

Pest Management Science

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Section: Resultssupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

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Comparison of a new air‐assisted sprayer and two conventional sprayers in terms of deposition, loss to the soil and residue of azoxystrobin and tebuconazole applied to sunlit greenhouse tomato and field cucumber

Pan

et al. 2017

Pest Management Science

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“…Furthermore, a higher spray volume also improved the coverage and effect of run-off. Llop et al 27 found that air assistance and flat-fan nozzles allowed a reduction in volume from 1000 to 600 L ha −1 while maintaining or improving spray quality distribution with a hand-held-trolley sprayer in greenhouse-cultivated tomato. Studies have also indicated that spray volume affects not only the deposition and distribution, but also the control efficacy.…”

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 addition to techniques using water-sensitive papers, other methods imply the use of fluorescent tracers. We can mention the work of Llop et al [15] in which the use of a fluorescent tracer (Helios SC 500; 0.1% v/v ) traced the deposition on the leaves of the plants (in ng per cm 2 ) as well as the coverage rate of the leaves by the sprayed product. In Reference [16], the authors tried to correlate the surface coverage rate and droplet size distribution.…”

Section: Introductionmentioning

confidence: 99%

Coupling Waveguide-Based Micro-Sensors and Spectral Multivariate Analysis to Improve Spray Deposit Characterization in Agriculture

Bendiab

Ryckewaert

Heran

et al. 2019

Sensors

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The leaf coverage surface is a key measurement of the spraying process to maximize spray efficiency. To determine leaf coverage surface, the development of optical micro-sensors that, coupled with a multivariate spectral analysis, will be able to measure the volume of the droplets deposited on their surface is proposed. Rib optical waveguides based on Ge-Se-Te chalcogenide films were manufactured and their light transmission was studied as a response to the deposition of demineralized water droplets on their surface. The measurements were performed using a dedicated spectrophotometric bench to record the transmission spectra at the output of the waveguides, before (reference) and after drop deposition, in the wavelength range between 1200 and 2000 nm. The presence of a hollow at 1450 nm in the relative transmission spectra has been recorded. This corresponds to the first overtone of the O–H stretching vibration in water. This result tends to show that the optical intensity decrease observed after droplet deposition is partly due to absorption by water of the light energy carried by the guided mode evanescent field. The probe based on Ge-Se-Te rib optical waveguides is thus sensitive throughout the whole range of volumes studied, i.e., from 0.1 to 2.5 μL. Principal Component Analysis and Partial Least Square as multivariate techniques then allowed the analysis of the statistics of the measurements and the predictive character of the transmission spectra. It confirmed the sensitivity of the measurement system to the water absorption, and the predictive model allowed the prediction of droplet volumes on an independent set of measurements, with a correlation of 66.5% and a precision of 0.39 μL.

show abstract

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

Cited by 28 publications

References 23 publications

Comparison of a new air‐assisted sprayer and two conventional sprayers in terms of deposition, loss to the soil and residue of azoxystrobin and tebuconazole applied to sunlit greenhouse tomato and field cucumber

Comparison of a new air‐assisted sprayer and two conventional sprayers in terms of deposition, loss to the soil and residue of azoxystrobin and tebuconazole applied to sunlit greenhouse tomato and field cucumber

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

Coupling Waveguide-Based Micro-Sensors and Spectral Multivariate Analysis to Improve Spray Deposit Characterization in Agriculture

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