The low-temperature and high-humidity environment in winter vegetable greenhouses is extremely unfavorable to vegetable production, which often leads to various diseases and causes great losses to vegetable farmers. Common downy mildew, Phytophthora, gray mold, and various bacterial diseases. How to reduce the humidity and maintain the necessary greenhouse temperature is the focus of vegetable cultivation in greenhouses, and it is also the key to disease prevention and control. The following points should be made:
1, warming and dehumidification. It means that in the winter, when the sun rises, it is necessary to pull the shed in time. By using the sun to rapidly increase the temperature of the shed, the humidity in the shed will naturally decrease as the temperature rises. This is the correct approach. Some people use the method of “precipitating and dehumidifying,†and it is unscientific to use the method of early release to reduce the humidity. Because the natural law is that the humidity decreases with the increase of temperature, and the early morning release of the wind will reduce the temperature of the shed, but it will increase the humidity, and the shed will be “foggingâ€, while the condensation will condense. Premature venting will also cause the carbon dioxide accumulated in the night shed to be lost outside the shed. This will reduce the chance of using these carbon dioxide to increase the photosynthetic rate and increase vegetable production. Therefore, vegetable growers should never use the wrong practice of “premature release of wind and dampnessâ€.
2, cover film to reduce evaporation. It is a very effective way to reduce the humidity in the shed. Covering the ground with a plastic film makes it difficult for surface moisture to enter the air. Watering under the membrane after the film is covered also reduces the evaporation of moisture. The cover film should pay attention to the exposed wetland on the southernmost side of the shed, and must not be left uncovered. In the greenhouse, downy mildew, epidemics, and gray mold are mostly spread from the front of the greenhouse to the north. The reason is that in this small area, the water on the shed film flows down, the film is wet, and the wet soil on the ground evaporates moisture, resulting in the wettest small space in the entire shed. This localized high-humidity microclimate is a lot of A good cause of disease outbreaks, where the onset is early and the disease is heavy, is therefore inevitable. The correct way is to cover the ground in front of the shed when the entire shed covers the mulch, and to form a small ditch under the membrane to drain away the water flowing down the shed. The weeds on the ground and the crop stalks can also play a role in the evaporation of some moisture. The dehumidification effect is worse than that of the cover film, but the organic matter can also be applied.
3, Science watering. It means that the roots of vegetables are susceptible to injury in the winter due to low greenhouse temperature, weak light, and excessive watering, resulting in yellowing of the leaves. Therefore, it is advisable to alternately water and reduce the amount of water while avoiding rainy days. In the winter, it is also necessary to avoid watering in the afternoon so as not to cause the ground temperature to drop suddenly in the afternoon watering, and to connect with the low temperature in the evening, so that it is difficult for the ground temperature to recover quickly and the root system is damaged. On the same day or the next day after watering, the temperature of the greenhouse should be increased by 2-3°C to reduce the air humidity in the greenhouse, and the temperature of the greenhouse can be raised to normal by raising the temperature of the greenhouse, which is beneficial to disease prevention and vegetable growth.
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2-Chloro-7-Cyclopentyl,Ribociclib Intermediates,Cas 1374639-76-5
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