The effect humidity has on spraying

These days, all farmers monitor the weather to know when the optimal time
to apply sprays and fertilizers to their crops. The ideal conditions are:

  • An air temperture of less than 25°C.
  • A relative humidity of more than 60 %.

The effects of humidity

Seasons also play an important role in deciding when and how to spray. In spring and fall, for example, the air humidity is almost always 60% (the minimum threshold for effective spraying). This means that the farmer may not follow the daily humidity values as closely as any value above 60% is acceptable. Still, values above 60% are even more ideal. Humidity is one of the metrics that our sensors can measure. Even though humidity is an important value for farmers to know, it still isn’t very closely monitored for some reason. But it’s crucially important for spraying, because at humidity values less than 60%, a substantial amount of the spray will evaporate into the air – leaving your crops untreated.
Checking the air humidity before spraying is especially important at the beginning of spring and during the entire summer. An ideal time to apply a new spraying system would probably be during the time that you apply fungicides and herbicides.

How does this look like in practice?

Because of humidity values, it is recommended to start spraying your crops in the early evening (e.g. between 6pm and 7pm). You’ll have enough time throughout the evening to spray twice more before the humidity values fall below 60%. Other factors which may alter your spraying plan could include the size of your operation, the number of employees you have, as well as the sophistication of your farming equipment.