Illinois Field Crop Applicators Practice Test

When categorized as fine, what is the range of droplet sizes in microns and its corresponding abbreviation?

1. 100-150 microns - F

2. 150-250 microns - F

3. 50-150 microns - F

4. 150-250 microns - M

The correct answer is: 150-250 microns - M

The classification of droplet sizes is crucial in agricultural applications, particularly for pesticide and herbicide spraying, as it influences coverage, drift potential, and efficacy. When droplet sizes are categorized as "fine," this typically refers to droplets that are smaller than average, generally falling within the range of 100-150 microns. This particular size range is optimal for ensuring that the droplets remain airborne for a longer duration, which helps in achieving more uniform coverage over the target area. Fine droplets can penetrate canopy layers effectively but also increase the risk of drift, where droplets are carried away by wind, thus posing a potential risk to non-target areas or organisms. Based on this understanding, the correct categorization aligns with the delineation of droplet size as fine within the typical range specified. The option referring to fine droplets accurately indicates the appropriate size range, making it the right choice for this question.