BOTANY
AGRONOMY
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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droplet size increases, wind speed increases
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droplet size decreases, wind speed decreases
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droplet size decreases, wind speed increases
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droplet size increases, wind speed decreases
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Detailed explanation-1: -According to a study, drift is far less likely to be a problem when droplets are 200 microns and larger in size. The same study indicates that spray particles under 50 microns in diameter remain suspended in the air indefinitely or until they evaporate.
Detailed explanation-2: -Spray drift is movement of airborne, liquid spray particles immediately after application. It is often unseen, and while often unavoidable, it can be minimized. Drift increases with wind speed and height above ground when drops are released. It increases with spray droplet size.
Detailed explanation-3: -Spray droplets smaller than 150 microns tend to be the most prone to drift. These small droplets fall more slowly than large droplets. They do not have enough weight to overcome air resistance and are likely to float in wind currents.
Detailed explanation-4: -Spraying when the wind speed is between 1.2 and 6 mph is the optimum window with ideal spraying conditions between 2 and 4 mph. Above this, there is a high risk of spray droplets reaching neighbouring fields and crops.