A portable scanning system for evaluation of spray deposit distribution

Zhu, Heping; Salyani, M.; Fox, Robert

doi:10.1016/j.compag.2011.01.003

Cited by 243 publications

(181 citation statements)

References 15 publications

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“…After field work, naturally dried water sensitive paper was removed, sealed in a plastic bag and taken back to the lab, the fog drop coverage on the wheat canopy and droplets distribution uniformity were computed by the image processing software Deposit Scan [16] . .…”

Section: Droplets Distributionmentioning

confidence: 99%

Droplet deposition and efficiency of fungicides sprayed with small UAV against wheat powdery mildew

Qin¹,

Xue²,

Zhang³

et al. 2018

International Journal of Agricultural and Biological Engineering

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Small unmanned aerial vehicle (UAV), a timely and effective pesticide sprayer, can be used to spray pesticide in a high efficiency without harming the crop, and is especially suitable for spraying for small farms and hills in Asian countries. In recent years, it has been chosen as a key and new technique for pesticide application. This paper studied the impact of UAV (UAV N-3) spraying parameters (different working height and different spraying concentrations) on the deposition of droplets on the wheat canopy and the prevention of powdery mildew. Water sensitive paper was used as the sampler to collect the pesticide droplets and image processing software Deposit Scan was used to compute the coverage rate of droplets on the wheat top layer to acquire the proportional distribution of droplets on the wheat lower layer. The experimental results showed the impact of spraying height on the distribution of droplets on the wheat upper layer was quite significant, when the spraying height was 5.0 m and the spraying speed was 4 m/s, the coverage rate of droplets on the wheat lower layer was the largest, as it was 45.6% of that on the upper layer, the droplets distribution was the most uniform, and the coefficient of variation was 33.13%. 450 g/hm 2 (dosage registered) of triadimefon SC (44%) was sprayed by the UAV, the control efficiency reached 55.1% after applying which was better than 20% and 40% of dosage decreased for each hectare, and the applying effect (35.6%) of 20% dosage decreased for each hectare had no significant difference from the applying effect (34.6%) applied by a knapsack-type electric sprayer. At 10 d after applying, the prevention effect realized by UAV was lower than that realized by a knapsack-type electric sprayer, and it may be correlated to the meteorological condition and water amount in the pesticide sprayed. Thus, when UAV spraying was chosen to prevent wheat powdery mildew under a serious disease situation, an auxiliary agent for spraying could be added to prolong the retention of pesticide on the plant surface to extend the pesticide effect. This study can provide a reference for the optimized design, performance upgrade and reasonable application of small UAV sprayers. Keywords: unmanned aerial vehicle (UAV), spraying pesticide, parameters optimization, fungicide deposition, wheat powdery mildew, control effect DOI: 10.25165/j.ijabe.20181102.3157Citation: Qin W C, Xue X Y, Zhang S M, Gu W, Wang B K. Droplet deposition and efficiency of fungicides sprayed with small UAV against wheat powdery mildew. Int J Agric & Biol Eng, 2018; 11(2): 27-32.

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Section: Droplets Distributionmentioning

confidence: 99%

Droplet deposition and efficiency of fungicides sprayed with small UAV against wheat powdery mildew

Qin¹,

Xue²,

Zhang³

et al. 2018

International Journal of Agricultural and Biological Engineering

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“…The literature provides several ways to evaluate a field application (Hewitt, 2010), those using water sensitive paper as artificial targets being much employed (Zhu et al, 2011). They are originally yellow surfaces that change its color to blue in contact with water droplets.…”

Section: Introductionmentioning

confidence: 99%

Computer programs for analysis of droplets sprayed on water sensitive papers

2013

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-The use of water-sensitive papers is an important tool for assessing the quality of pesticide application on crops, but manual analysis is laborious and time-consuming. Thus, this study aimed to evaluate and compare the results obtained from four software programs for spray droplet analysis in different scanned images of water-sensitive papers. After spraying, papers with four droplet deposition patterns (varying droplet spectra and densities) were analyzed manually and by means of the following computer programs: CIR, eSprinkle, DepositScan and Conta-Gotas. The diameter of the volume and number medians and the number of droplets per target area were studied. There is a strong correlation between the values measured using the different programs and the manual analysis, but there is a great difference between the numerical values measured for the same paper. Thus, it is not advisable to compare results obtained from different programs.Keywords: spray quality, pesticides, sprayer, droplet size, application technology.RESUMO -A utilização de papéis hidrossensíveis é uma importante ferramenta para avaliar a qualidade da aplicação de produtos fitossanitários nas lavouras, porém sua leitura manual é trabalhosa e morosa. Dessa forma, com o presente trabalho objetivou-se avaliar e comparar os resultados de quatro programas computacionais de análise de gotas em diferentes imagens digitalizadas de papéis hidrossensíveis. Após a pulverização, papéis com quatro padrões de deposição, variando densidade e tamanho de gotas pulverizadas, foram analisados manualmente e por meio dos programas computacionais: CIR, e-Sprinkle, DepositScan e Conta-Gotas. Foram estudados o diâmetro da mediana volumétrica e numérica e o número de gotas por centímetro quadrado. Existe forte correlação entre os valores medidos com o uso dos diferentes programas e a análise manual, porém há grande diferença entre os valores numéricos para um mesmo papel, motivo pelo qual não é recomendável comparar resultados obtidos com diferentes programas.Palavras-chave: qualidade de pulverização, produtos fitossanitários, pulverizador, tamanho de gota, tecnologia de aplicação.

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“…The spray chamber held an 11002 nozzle with a 50 mesh filter. Water-sensitive cards were sprayed to determine the droplet spectrum (precise droplet size and amount) using DepositScan software (Zhu et al 2011). The average volumetric diameter and number of droplets per unit area (drop ⋅ cm -2 ) were calculated on three sites of each water-sensitive card.…”

Section: Application Conditionsmentioning

confidence: 99%

Determination of optimal doses of glyphosate for controlling weeds at several stages in southwestern Buenos Aires province (Argentina)

Bentivegna¹,

Moyano²,

Daddario³

et al. 2018

Journal of Plant Protection Research

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Efficient weed management is essential for avoiding competition for water, light, and nutrient resources in semiarid zones. Chemical weed control with glyphosate was evaluated on perennial wall-rocket (Diplotaxis tenuifolia), artichoke thistle (Cynara cardunculus), slender wild oat (Avena barbata), and perennial ryegrass (Lolium perenne). Plants at early, middle and advanced vegetative stages were used in this study. Glyphosate potassium salt was applied at rates of 0.0675 (1/16x), 0.135 (1/8x), 0.27 (1/4x), 0.54 (1/2x), 1.08 (x) and 2.16 (2x) kg acid equivalent (ae) ⋅ ha -1 . Glyphosate combined with 2,4-D amine salt was evaluated at rates of 1.08 kg ae ⋅ ha -1 and 0.53 kg active ingredient (ai) ⋅ ha -1 , respectively. The volume of the spray was 100 l ⋅ ha -1 with 86 droplets ⋅ cm -2 and a Volume Median Diameter (VMD) of 421.19 µm. In general, all the tested weeds were controlled with a quarter of the label rate. Three sizes of tested plants were controlled in a similar way at the same glyphosate dose rate. Moreover, the addition of 2,4-D to glyphosate did not produce an increase in the control of broadleaf weeds. The results showed that glyphosate was effective in controlling the tested weed species, including low application rates for all the growth stages in the southwestern Buenos Aires province.

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A portable scanning system for evaluation of spray deposit distribution

Cited by 243 publications

References 15 publications

Droplet deposition and efficiency of fungicides sprayed with small UAV against wheat powdery mildew

Droplet deposition and efficiency of fungicides sprayed with small UAV against wheat powdery mildew

Computer programs for analysis of droplets sprayed on water sensitive papers

Determination of optimal doses of glyphosate for controlling weeds at several stages in southwestern Buenos Aires province (Argentina)

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