Different light transmittance: the light transmittance of the white film is 40%, the thermal radiation rate is 80-90%, the light transmittance of the black film is 1-3%, and the thermal radiation rate is 30-40%.
Different weeding effects: White film can only inhibit the growth of weeds, while black film can leave weeds in an environment where photosynthesis is not possible, with significant weeding effects.
1. Difference in temperature difference
1. White film: Large temperature difference between day and night, low ground temperature at night.
2. Black film: small temperature difference between day and night, high ground temperature at night.
2. Different light transmittance
1. White film: The light transmittance reaches 40%, and the thermal radiation rate reaches 80-90%, which is close to the transparent plastic film.
2. Black film: Light transmittance is 1-3%, thermal radiation is only 30-40%, good air permeability, and the plant is not prone to premature aging.
3. Different weeding effects
1. White film: It has a certain inhibitory effect on weeds and is mainly used for flat covering, which can solve the problem of serious grass damage after covering transparent plastic film
2. Black film: It is almost opaque to light, and weeds are difficult to germinate and undergo photosynthesis, so the weeding effect is significant.