When is the optimum time for making an aerial application of a liquid to minimize droplet evaporation?

The optimum time for making an aerial application of a liquid to minimize droplet evaporation is early morning. During this time, temperatures are generally cooler, and relative humidity levels are higher. These conditions create an environment that reduces the rate at which droplets evaporate after they are released into the air.

Evaporation from droplets is influenced significantly by temperature and humidity; when temperatures are relatively low and humidity is high, the air has a greater capacity to retain moisture, allowing the droplets to remain intact for a longer period as they descend to the target area. Applying in the early morning helps maximize the effectiveness of the application by ensuring that more of the pesticide or fertilizer reaches the intended target without losing its efficacy due to evaporation.

As for the other times mentioned, midday typically has higher temperatures and lower humidity, leading to increased evaporation rates. Late afternoon can still be warm, and humidity may not have fully increased yet. Evening applications could be effective but may also face challenges such as dropping temperatures, which may lead to increased dew formation, potentially causing the droplets to clump together rather than disperse effectively. Thus, early morning stands out as the most effective time for minimizing droplet evaporation.