Spray Deposition and Mass Balance in Citrus Orchard Applications

Salyani, M.; Farooq, Muhammad; Sweeb, Roy D.

doi:10.13031/2013.24092

Cited by 54 publications

(35 citation statements)

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“…In this study, the drift was not evaluated, which prevents that a complete study of the mass balance is done, the similarity of SALYANI et al (2007). However, taking into consideration that the deposition in the target was similar for the three used nozzles and the runoff was greater for the TVI nozzle, possibly the loss for drift must have been greater with the use of MAG and AD nozzles, which produces smaller droplets, since the amount of spray applied per area was the same in all treatments.…”

Section: Resultsmentioning

confidence: 99%

Spray deposition and chemical control of the coffee leaf-miner with different spray nozzles and auxiliary boom

Neto

Cunha

2016

Eng. Agríc.

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ABSTRACT:The coffee crop requires great spray ability to penetrate into the plant canopy during the application of pesticides. The aim of this study was to evaluate the spray deposition on leaves of coffee plants and the chemical control of the leaf miner provided by the application of different spray nozzles, with and without the use of an auxiliary boom. The deposition on the upper, middle and lower parts of the plants and the losses to the soil were evaluated using a tracer quantified by spectrophotometer. We also evaluated the chemical control of the leaf miner, counting the larvae, after the application of the insecticides cartap and fenpropathrin. The trial was carried out in a randomized block design, with four replications, in a factorial model (2×2+1): with and without the auxiliary boom, three spray nozzles (hollow cone -MAG 02, flat fan -AD 11002 and air induction hollow cone -TVI 8002) and a control. The use of the auxiliary boom increased the deposit ion in the lower part of the plants but decreased in the middle part, besides the increase in the runoff. The different nozzles do not provided differences in the deposition, showing the technical feasibility in the use of the hollow cone nozzles with coarse droplets and flat fan. All the chemical control decreased the leaf miner population, without differentiation.

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Section: Resultsmentioning

confidence: 99%

Spray deposition and chemical control of the coffee leaf-miner with different spray nozzles and auxiliary boom

Neto

Cunha

2016

Eng. Agríc.

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“…32,33 Wang et al have done related research on other types of single-rotor UAV and found that 90% drift distance was within 15 and 8 m. 34,35 This study showed that the 90% drift distance was 3.7-46.5 m. It is speculated that it is related to the height of the test, the UAV speed, the UAV type, and the tropical monsoon climate in Hainan. 32,33 Wang et al have done related research on other types of single-rotor UAV and found that 90% drift distance was within 15 and 8 m. 34,35 This study showed that the 90% drift distance was 3.7-46.5 m. It is speculated that it is related to the height of the test, the UAV speed, the UAV type, and the tropical monsoon climate in Hainan.…”

Section: Discussionmentioning

confidence: 97%

Meteorological and flight altitude effects on deposition, penetration, and drift in pineapple aerial spraying

Wang

Lan

Wen

et al. 2020

Asia-Pacific J Chem Eng

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It is difficult for the handheld/backpack or ground machinery to spray pineapple plant fields because the plant profile is relatively inaccessible. In this situation, unmanned aerial vehicles (UAVs) are a good choice for easy access and no physical damage to the crops. Aerial spray quality and optimum application parameter settings can be influenced by many factors such as UAV type, UAV operating parameters, meteorological conditions, crop growth period, and pest species. The objective of this study was to investigate the effects of different meteorological conditions and UAV operating height on the spray application in pineapple fields. There were five treatments involving three UAV operating heights. Mylar cards, water-sensitive papers, and airborne concentrations of spray were sampled at various locations from −10 to 50 m downwind of the edge of the sprayed blocks. The results indicated that as the wind speed increased, the swath location was displaced 2 to 4 m, the percent area coverage uniformity changed along with the spray penetration capacity, and the 90% of total measured drift distance varied from 3.7 to 46.5 m. The test results again proved that droplet size and wind speed were significant factors in spray transport and impacted the UAV spray quality.

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“…It is important to have an understanding of the characteristics of the crop canopy to ensure the application of spray is on target and efficient. Key factors are sprayer droplet sizes, turbulence and wake effects, as well as how these interact together with the weather conditions at the time of application (Fox et al 1990;Miller et al 2000;Salyani et al 2007). Although agrichemicals ultimately target pest or disease organisms, the primary target of spray application is the crop canopy where the default application aim is to maximise spray retention on the target as uniformly as practical.…”

Section: Introductionmentioning

confidence: 99%

“…Whitney and Roth (1985) devised a way of doing this using a string system and a relatively automated fluorimeter to assess the pattern. More recent studies, such as Balsari et al (2005) and Salyani et al (2007), have used engineered approaches to suspend samplers (strings or cellulose filter cloth) to assess the movement of liquid mass through orchard vegetation. However, none of these provide quick, quantitative and repeatable measurements.…”

Section: Introductionmentioning

confidence: 99%

Phase Doppler quantification of agricultural spray compared with traditional sampling materials

Roten

Post

Werner

et al. 2017

NZPP

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The quantification of spray mass has historically been accomplished by means of fluorescent dyes and various string and ground samplers to capture the dye-laden spray. However, these methods are typically not used in close proximity to orchard sprayers and are prone to many sources of error. The objective of this study was to assess the ability of an in-field phase Doppler (pD) interferometer to quantify spray mass against two common string samplers. Measurements were taken at 0.5 m increments to 4.5 m vertically and 1.0 m increments to 5.0 m downwind from the spray. Converted flux measurements from the strings were compared with those obtained using the pD interferometer. The current pD technology was found to be incapable of collecting equivalent flux data to that obtained from the strings. However, the pD equipment did provide useful data on droplet velocity and size.

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Spray Deposition and Mass Balance in Citrus Orchard Applications

Cited by 54 publications

References 0 publications

Spray deposition and chemical control of the coffee leaf-miner with different spray nozzles and auxiliary boom

Spray deposition and chemical control of the coffee leaf-miner with different spray nozzles and auxiliary boom

Meteorological and flight altitude effects on deposition, penetration, and drift in pineapple aerial spraying

Phase Doppler quantification of agricultural spray compared with traditional sampling materials

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