How do farmers use agricultural plastic covers to protect crops from frost damage?

Farmers use agricultural plastic covers, often called frost protection covers or frost blankets, to insulate crops from frost damage. These covers are lightweight, transparent, and permeable to light, allowing photosynthesis to continue while trapping heat. They are typically placed directly on the plants or over rows using hoops or frames. At night, when temperatures drop, the covers reduce heat loss by forming a barrier that slows the escape of warm air. This helps to maintain a warmer microclimate around the plants, preventing frost formation. In the morning, the covers can be removed to let in fresh air and sunlight. This method is particularly effective for protecting tender crops like leafy greens, flowers, and early-season vegetables.