Film mulching can improve the root activity of Chinese cabbage and promote the growth of Chinese cabbage. According to the experimental observation, cabbages covered with mulching film have thick main roots and many lateral roots, which can delay root senescence. Seeding cabbage seedlings after one month sowing, the growth of the cover film was significantly stronger than that of the non-covered ones, which showed a large number of leaves and large leaves. Film mulching can increase the soil temperature and promote the later growth of Chinese cabbage. The Chinese cabbage covered with plastic film has a strong growth ability at the later stage, and the temperature of the leaf sphere is 0.3°C higher than that without covering, which can reduce the freezing injury and prolong the growth period. According to the experiment, sowing in August, Chinese cabbage cultivated 7150 kg per mu, the heart rate was 86%, and the first-class rate of commercial vegetables was 80%; the output of uncoated Chinese cabbage was only 4900 kg per mu, and the heart rate was only 49%, the first grade of commercial food is 70%. Overlay of the film was 45.9% higher than the uncoated film. The cover film can reduce the damage of cabbage diseases, and the prevention and treatment of viral diseases is particularly obvious. Experiments have shown that Chinese cabbage virus disease is mainly transmitted by winged aphids. The fundamental measure of prevention and control is to prevent the flight of winged aphids, especially before the six-leaf period of Chinese cabbage. After being covered with mulching film, due to the reflection of light, winged locusts can be effectively prevented from flying in. The winged worms in Chinese cabbage can be reduced by more than 57% at the seedling stage, virus diseases are also significantly reduced, and the disease prevention effect reaches over 70%. The activity of downy mildew requires high air humidity, the cover film can effectively inhibit the evaporation of surface moisture, and the humidity of the microclimate between the Chinese cabbage plants and the plants is low, which can significantly inhibit the activity of downy mildew and reduce downy mildew. Harm. It can be seen that the cabbage covered with plastic film is an effective technology for increasing production.
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