Everyone knows that the environment of low temperature and high humidity in winter is definitely not conducive to the growth of vegetables, and it can cause a variety of diseases. It is more serious than vegetable downy mildew, phytophthora, gray mold, etc. Economic losses. Therefore, if the temperature in the shed is increased, reducing the humidity becomes the most important method for greenhouse vegetable cultivation, and it is also the most direct method for disease prevention.
To reduce the air humidity in the greenhouse, it is necessary to do the work of heating and lowering the humidity, reducing the evaporation of the membrane, and scientific watering.
First, warming and dehumidification
It refers to the winter season, when the sun comes out, it is necessary to pull the shed in time. With the sunlight to increase the temperature inside the shed, the humidity in the shed will gradually drop due to the increase of temperature.
Second, cover the mulch, reduce evaporation
This is also a way to effectively reduce the humidity in the shed. After the ground is covered with the mulch film, the moisture on the ground is difficult to enter the air, and the watering under the membrane can also reduce the moisture in the air, thereby effectively reducing the humidity. When covering the mulch film, you need to pay attention to the full humidity, especially in the southernmost part. Do not miss the place. It is necessary to know that downy mildew, blight, gray mold and other diseases often start from the southernmost side, and then slowly spread along the north, because there is downward flow of water on the southernmost side, after the film is raining or frosting. It is wet, there is water evaporated by the soil, and the place with the highest humidity is in this small space. Therefore, the best solution is to cover the mulch in the whole shed. When covering the mulch, you can dig a small ditch under the mulch. So that you can drain the water flowing down the shed film. Of course, it is also possible to place some items on the surface to reduce the evaporation of water. For example, weeds and crop straws on the ground floor, although not comparable to the cover film, can also increase the organic matter, which is also feasible.
Third, scientific watering
In the cold winter season, because the temperature in the shed is relatively low and the light is not strong, if a large amount of water is poured at this time, it is not conducive to the growth of the roots of the vegetables, resulting in yellowing of the leaves. Therefore, it is possible to take watering in a row, watering a small amount, and avoiding the rainy weather when watering, to avoid watering in the afternoon. On the day after watering or the next day, it is necessary to increase the temperature in the shed to 2-3 degrees. The temperature increase can reduce the humidity of the air in the shed, and the temperature in the shed can be restored to normal. This can be effective. Prevention and treatment of diseases is conducive to the healthy growth of vegetables.
4. The pathogens of vegetable diseases are mostly fungi, oomycetes and bacteria.
The three types of fungi, oomycetes and bacteria are particularly fond of wet places. If the humidity in the shed is high, it will easily infect the vegetables, which is not conducive to the healthy survival of vegetables. Reducing the humidity in the shed not only inhibits the release of the disease, but also lays the foundation for preventing disease.
The above is the management measures for planting temperature rise and humidity reduction in greenhouses. If you are interested, you can also pay attention to Hui Nong.
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