Relative humidity
It is the ratio of the actual amount of water vapor in the air to the maximum amount the air could hold at a specific temperature, expressed as a percentage.
Также говорят: air humidity
Relative humidity is a critical environmental factor that dictates plant transpiration rates and susceptibility to diseases. High humidity levels often create favorable conditions for fungal outbreaks, while excessively dry air restricts stomatal conductance, causing plant stress and potential yield loss.
In greenhouse management, growers use automated ventilation, misting, and irrigation systems to maintain humidity within optimal ranges. In open-field agriculture, monitoring humidity is essential for timing pesticide applications; low humidity may cause rapid droplet evaporation, reducing the chemical's efficacy, whereas high humidity might lead to chemical runoff.
A common mistake is neglecting the diurnal variation of humidity, which can significantly shift during the day. Monitoring conditions throughout the crop growth cycle is vital for adjusting management practices effectively.