Corn Sweat for Dummies.
"Corn sweat" is a colloquial term for evapotranspiration, the natural process of water evaporating from plants into the air. Evapotranspiration is essentially a plant's way of breathing, All plants sweat!
When a plant draws in water from the soil through its root system, that water is transported through the plant's tissues, where it plays a role in metabolic and physiological processes. The leaves then release water vapor into the atmosphere through their stomata.
This water vapor increases the moisture in the air, increasing the humidity,
During the growing season, an acre of corn sweats off about 3,000 to 4,000 gallons of water each day, the U.S. Geological Survey says. Top corn-producing states in the Midwest grows thousands, or even tens of thousands, of acres of corn each year.
The more water vapor there is in the air, the more humid things will be and, generally, the hotter it will feel to the human body.
Still, although it may bring discomfort to humans, corn sweat is a sign of healthy crops. When plants become stressed, like during a drought, they close their stomata to conserve water. This defense mechanism means the plant releases less water vapor, but it can also limit the plant's growth.