What are the precautions for mulch film covering in vegetable greenhouses?
Vegetable cultivation is very common in China, and nowadays no matter what kind of vegetables are grown, greenhouse cultivation is generally the main method. And when growing vegetables in greenhouses, mulch film covering is indispensable. When covering vegetable greenhouses, there are many points that require our attention. So what exactly are they? Below, the editor brings you the precautions for mulch film covering in vegetable greenhouses. Let's take a look!
1. Pay attention to mulch film selection
Mulch film selection is the first thing we need to pay attention to. Mulch film is generally divided into two types: industrial film and agricultural film. When growing vegetables, we must mainly use agricultural mulch film and must not choose industrial mulch film. This is because industrial mulch film contains certain toxic substances that can cause harm to crops, and in severe cases can lead to total crop failure. Agricultural mulch film is mainly divided into transparent film, black film and silver-gray film. When choosing mulch film, we should make a reasonable choice according to seasonal changes and the crops being grown. If heat preservation and moisture retention are needed, then transparent film should be the main choice, while if cooling and weed suppression are needed, then black film should be the main choice.
2. Pay attention to water management
Many people, when covering with mulch film, think that the mulch film has a water-retaining effect, so after covering they neglect water management. However, the water-retaining effect of mulch film is premised on there being water in the soil. Therefore, before covering with mulch film, we should water adequately to increase the soil moisture content, ensure the seedling emergence rate, and also ensure the healthy growth of vegetable seedlings. However, if the soil is too sticky and heavy, and excessive water content reduces the oxygen content, then it is very unfavorable for vegetable seed germination. Therefore, it should be aired and dried, and mulch film should be covered only when the humidity is suitable, to avoid root rot and seedling death caused by excessive humidity.
3. Pay attention to sowing time
If mulch film is used when growing vegetables, because of its good heat preservation performance, good soil moisture conditions and fast seedling emergence speed. Therefore, if a late frost occurs, it is very easy to cause the seedlings to freeze, resulting in seedling death. Therefore, be sure to control the sowing time well. First, consider the environmental requirements of the seedlings. Then there is the frost period of the growing area, and finally the time from sowing to seedling emergence of the variety being grown. If the three conditions are suitable, then it is best to sow before the final frost period and ensure emergence after the final frost period, which is very beneficial for yield.
4. Pay attention to fertilization
Many people apply fertilizer blindly during the growing process in order to increase yield. Especially when sowing, they apply fertilizer in strips, which not only leads to fertilizer waste and higher growing costs, but may also cause fertilizer burn to seedlings. However, some people think that covering with mulch film can increase yield, so they greatly reduce the amount of organic fertilizer and chemical fertilizer used, thus causing vegetables to suffer from fertilizer deficiency later and reducing yield. When fertilizing, no matter what kind of fertilizer it is, we should mainly use full-layer fertilization, deep plowing it about 25 cm to ensure full mixing with the soil and avoid shallow application on the surface soil. Finally, control the amount of fertilizer applied well, and organic fertilizer must be fully decomposed.
The above is a brief introduction to the precautions for mulch film covering in vegetable greenhouses. That is all for today's introduction. This article is for reference only, and we hope it can help everyone!