Why is humidity a factor in heat stress for plants?

High humidity reduces a plant's ability to cool itself through transpiration (releasing water vapor from its leaves). Just like with humans, when the air is already full of moisture, sweat (or transpiration) doesn't evaporate as effectively, leading to overheating.

What should I do if the stress level is high or extreme?

If high or extreme heat stress is predicted, consider actions like providing extra water, using shade cloths to reduce direct sunlight, and ensuring good air circulation to help the plants cope with the stressful conditions.

Plant Heat Stress Index Calculator

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