The occurrence of cucumber disease requires proper temperature, humidity and oxygen. If the humidity in the greenhouse is large, especially in the case of cucumber leaf surface droplets, downy mildew, keratopathies, and other diseases occur rapidly. If the humidity in the greenhouse is reduced to below 80% and maintained for about 4 hours, then Can inhibit the occurrence of diseases. So how to reduce greenhouse moisture?
1. Use drop-free film. The use of a non-drop film can reduce the amount of water on the surface of the film, overcome the disadvantages of a large amount of water droplets attached to the inside of the film, can significantly reduce the humidity, and has a good light transmission performance. The light transmittance is 10% to 15% higher than that of the normal film, which is advantageous to Increase temperature and humidity.
2. Cover the film. The cover film can reduce the number of surface water evaporation and irrigation, so as to reduce the humidity in the greenhouse. The mulching film can generally increase the ground temperature at 10 cm by an average of 2°C to 3°C, and the ground minimum temperature can be increased by about 1°C.
3. Ridge cultivation. High ridges have a large surface area, receive more light during the day, and absorb more heat from the air, which results in rapid warming, rapid evaporation of soil moisture, and high humidity.
4. Reasonably water. Control the amount of water, do not flood irrigation. Low temperature days to water the shed vegetables, to do "five-five no water," that is, pouring water is not pouring yin (sunny watering, cloudy not watering), pouring before pouring (no water before noon, no afternoon pouring Water), pouring a small water (not pouring large water, not flood irrigation), pouring temperature not pouring cold (watering first in the shed to warm up, until the water temperature and ground temperature close to the time of pouring), pouring dark does not pour Ming (pouring of dark water, not pouring water). At the same time, we must vigorously promote irrigation techniques such as drip irrigation and under-membrane irrigation.
5. Improve the method of application. Low-temperature days to control greenhouse pests and vegetables, it is necessary to use smoke or dust method. If spray application is used, the number of controls and the amount of liquid to be sprayed should be appropriately reduced to prevent excessive humidity in the booth.
6. Ventilation and humidity. Ventilation is the most basic dehumidification method for plastic greenhouses. Within one day, the best time for ventilation and dehumidification is noon, because during this period, humidity inside and outside the shed is very different and moisture is relatively easy to discharge. In other periods, the ventilation time should be extended as long as possible under the premise of ensuring temperature requirements. In addition, special attention should be paid to enhancing ventilation and dehumidification within 2 to 3 days after the watering of the greenhouse, 1 to 2 days after spraying the fertilizer (drug) on ​​the foliage, before and after the rainy (snow), and before and after sunset.
7. Rilled soil. After the watering, the cultivator must be ploughed in time to cut off the capillary to prevent the lower layer of soil from moving to the topsoil.
8. Manually absorb moisture. If the humidity in the greenhouse is too large, some straw, wheat straw, ash or fine dry soil can be sprinkled between the rows, or quick moisture can be accumulated in the shed.
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