Film mulching is a commonly used technique for the production of vegetables in solar greenhouses. The use of plastic mulching not only improves ground temperature, reduces evaporation of soil moisture, prevents ground panel knots, but also reduces air humidity in sheds, reduces the occurrence and spread of diseases, and is beneficial to vegetables. The growth and development. When the mulching film is used to create a good growing environment for the vegetables, if it is used improperly, it will easily have the opposite effect, causing vegetable burns and affecting the growth of the plants.
Hazardous symptoms and causes analysis
More common is that in sunny high temperatures, plastic film sealing is not strict, easy to burn vegetables. This situation is mainly due to the increase in temperature of the mulching film, which causes moisture in the surface soil to vaporize, forming water droplets on the surface of the membrane. When the planting hole is exposed, the vaporized hot air under the membrane rushes out of the hole. The temperature of hot air, especially at sunny noon temperatures, often burns seedlings or causes heat damage to the leaves, rhizomes, or bases of the vegetables. Not only does it cause plant damage, it is also susceptible to pathogenic bacteria and causes stems. Corruption and other diseases, resulting in lack of seedlings and ridges or affect the normal growth of plants, severe cases will lead to reduced production.
In addition, when the leaves are in contact with the mulching film when the weather is sunny and hot, the temperature of the mulching film is high, and it is also easy to burn the leaves. This problem occurs when black mulch film is covered.
Precaution
After the vegetable is covered with the film, it can be pressed on the film with fine soil to seal the planting hole and prevent the hot gas in the film from burning the vegetables. At the same time, timely attention should be paid to the weather. In case of high-temperature and high-light conditions, shade nets should be covered in time to prevent overheating in the shed.
Emergency measures after burn injury
If it is found that the plant has been burned, the fine earth should be pressed on the mulch surrounding the plant for the first time, and the gap between the mulch and the plant should be sealed to prevent the high temperature in the mulch from continuing to harm. In addition, depending on the degree of burns, it can be handled in the following ways:
1. If the burn injury occurs, the damage is not serious. You can use a medicine containing ingredients such as brassinolide, gibberellin, etc. to spray, regulate plant growth, and strengthen fertilizer and water management to strengthen the plant roots, so that the plants quickly return to growth. .
2. If the film seedlings are small and heat damage occurs, in order to prevent stem rot and other diseases, some protective fungicides can be sprayed for prevention.
3. If the plant damage is serious, remove it in time and replace it with new plants to reduce losses.
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