China Naming Network - Weather knowledge - Is it effective to cover vegetables with plastic bags in frost weather to prevent frost?

Is it effective to cover vegetables with plastic bags in frost weather to prevent frost?

effective

In the cold winter, cold currents often strike. Covering vegetable fields with plastic film can prevent sudden frost and freezing of vegetable leaves. Specifically, it is 1. Thermal insulation (small internal air convection) 2. Absorb light energy (because it is transparent) 3. Keep moisture, ie keep vegetables fresh.