The difference between black plastic film and white plastic film

1. The temperature difference between day and night between black plastic film and white plastic film is different. The ground temperature difference of black plastic film is small, while the temperature difference between day and night of white plastic film is large. Black plastic film has high ground temperature at night, while white plastic film has low ground temperature at night.

Under the sunlight, the black plastic film itself has the advantages of rapid temperature rise and high humidity, but less heat is transferred to the soil, so the warming effect is not as good as that of the transparent film, and it also has a cooling effect during the day in summer. When in use, it can be tiled on the ground to expose crops outside the film, or it can be tiled between crops.

Second, the transmittance of black plastic film is different from that of white plastic film. The permeability of black plastic film is better than that of white plastic film, and the plants with black plastic film are not prone to premature aging. The light transmittance of black plastic film is only 1% ~ 3%, and the thermal radiation is only 30% ~ 40%. The thermal radiation rate of white plastic film is 80% ~ 90%, which is close to transparent plastic film, and the light transmittance is only 40%.

Thirdly, black plastic film and white plastic film have different weeding effects. Because the black plastic film is almost opaque, weeds cannot germinate and carry out photosynthesis, and the weeding effect is remarkable. White plastic film has a certain inhibitory effect on weeds. It is mainly used for tile mulching, which can solve the serious problem of grass damage caused by transparent plastic film mulching.

Extended data:

Different colors of plastic films have different absorption and reflection laws on spectra, and have different effects on crop growth, weeds, pests and diseases, and ground temperature. Therefore, different colors of plastic films should be selected according to the characteristics of different crops and planting seasons.

Since the rise of plastic film, its function has been very obvious. Land covered with plastic film can increase soil temperature and keep humidity, which has a good effect on crop growth. Summer is the season for many vegetables to grow, and the weather is hot. The method of covering with plastic film is very moisturizing, which is beneficial to the robust growth of crops.

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