Plastic film mulching is a common technology in the production of vegetables in solar greenhouses. Using plastic film mulching can not only increase the ground temperature, reduce soil moisture evaporation, prevent ground slab knots, but also reduce the air humidity in the shed, reduce the occurrence and spread of diseases, and benefit vegetables. Growth and development. The plastic film mulch creates a good growth environment for vegetables, and if used improperly, it is likely to have the opposite effect, causing vegetable burns and affecting plant growth.
Analysis of hazard symptoms and causes
More commonly, in sunny and hot weather, the plastic film is not tightly sealed, and it is easy to burn vegetables. This situation is mainly due to the translucent temperature increase of the plastic film, which vaporizes the moisture of the ground soil layer and forms water droplets on the lower surface of the film. When the planting hole is exposed, the hot air vaporized under the film is washed out of the hole. This vaporization The temperature of the hot air, especially when the temperature is high at noon on a sunny day, often burns the seedlings, or causes heat damage to the leaves, rhizomes or stem bases of vegetables, which can not only cause plant damage, but also easily infect pathogens and cause stem bases Diseases such as rot, resulting in lack of seedlings and ridges or affecting the normal growth of plants, in severe cases will lead to reduced production.
In addition, when the weather is sunny and high, the leaves of the plant contact the mulch. At this time, the temperature of the mulch is high, and it is also easy to burn the leaves. This problem occurs more often when the black mulch is covered.
Precaution
When the vegetable film is over, you can use fine soil to press on the plastic film to seal the planting holes and prevent the hot air in the plastic film from burning the vegetables. At the same time, pay attention to the weather in time. In case of high temperature and strong light, cover the shading net in time to prevent the temperature in the shed from being too high.
Emergency measures after a burn
If it is found that the plant is burned, the fine soil should be pressed against the mulch around the plant as soon as possible to seal the gap between the mulch and the plant to prevent the high temperature in the mulch from continuing to harm. In addition, according to the degree of burns, the following methods can be used:
1. If the damage is not serious after the burn, you can use a drug containing brassinolide, gibberellin and other ingredients to spray to regulate plant growth, and at the same time strengthen fertilizer and water management, strengthen the root system of the plant and restore the plant's growth quickly .
2. If the film-covered seedlings are small, after the occurrence of heat damage, in order to prevent the occurrence of stem base rot and other diseases, some protective fungicide spraying can be used for prevention.
3. If the damage to the plant is serious, remove it in time and replace it with a new plant to reduce losses.
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