Sprayers and Spray Application Techniques
Two general types of Trigger
Sprayer(KEXON) are available for greenhouseapplication of pesticides:
hydraulic and low-volume. There are many variationsof these that fit particular
crops or growing methods.
In the hydraulic sprayer, a pump supplies energy thatcarries spray material to the target (plant foliage). Water is the carrier andthe pump creates the pressure at 40-1000 psi. Spray material is usually appliedto “wet” or “drip.” Nozzles on the boom or handheld gunbreak the spray into small droplets and direct it to the foliage.
In a low-volume (LV) sprayer, spray material in a water oroil carrier is injected into a high-speed air stream developed by a fan, bloweror compressor. In most LV sprayers, a small pump is used to inject aconcentrate pesticide solution into the air stream. The speed of the air streammay be as high as 200 mph. To get sufficient coverage, the air within thefoliage canopy must be replaced with air that contains the pesticide. As thedroplet size is much smaller, good coverage can be achieved with less chemical.
Sprayer Differences
One way to distinguish between a hydraulic sprayer andlow-volume sprayer is by droplet size. Hydraulic sprayers produce a spray withmost droplets in the 200-400 micron diameter range (thickness of the human hairis about 100 microns). Low-volume sprayers develop a mist (50-100 microns) orfog (0.05-50 microns). Small droplets from a mist or fog applicator can resultin more uniform coverage and greater likelihood of contact with the insect ordisease. In contrast to the hydraulic sprayer, spray material is usuallyapplied to “glisten” as it is difficult to see the individualdroplets on the leaf.
One disadvantage to smaller droplets is that they evaporatequicker when the humidity is low and may not reach the target. Another is thatthe tiny droplets tend to bounce or skip on the leaf surface. This can beovercome somewhat by adding a spreader and sticker.
Click PP Bottle to learn about more information
In the hydraulic sprayer, a pump supplies energy thatcarries spray material to the target (plant foliage). Water is the carrier andthe pump creates the pressure at 40-1000 psi. Spray material is usually appliedto “wet” or “drip.” Nozzles on the boom or handheld gunbreak the spray into small droplets and direct it to the foliage.
In a low-volume (LV) sprayer, spray material in a water oroil carrier is injected into a high-speed air stream developed by a fan, bloweror compressor. In most LV sprayers, a small pump is used to inject aconcentrate pesticide solution into the air stream. The speed of the air streammay be as high as 200 mph. To get sufficient coverage, the air within thefoliage canopy must be replaced with air that contains the pesticide. As thedroplet size is much smaller, good coverage can be achieved with less chemical.
Sprayer Differences
One way to distinguish between a hydraulic sprayer andlow-volume sprayer is by droplet size. Hydraulic sprayers produce a spray withmost droplets in the 200-400 micron diameter range (thickness of the human hairis about 100 microns). Low-volume sprayers develop a mist (50-100 microns) orfog (0.05-50 microns). Small droplets from a mist or fog applicator can resultin more uniform coverage and greater likelihood of contact with the insect ordisease. In contrast to the hydraulic sprayer, spray material is usuallyapplied to “glisten” as it is difficult to see the individualdroplets on the leaf.
One disadvantage to smaller droplets is that they evaporatequicker when the humidity is low and may not reach the target. Another is thatthe tiny droplets tend to bounce or skip on the leaf surface. This can beovercome somewhat by adding a spreader and sticker.
Click PP Bottle to learn about more information
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