In the cold season of winter and spring, plastic greenhouses are often not densely ventilated, and the excessively high humidity in the air will inhibit the normal water transpiration of the plants, slow down the normal water circulation of the soil, induce and aggravate the occurrence of pests and diseases, and easily cause flower drop and fruit drop. So, how to reduce the air humidity in the shed?
1. Use drop-free film. The use of non-drop film can reduce the amount of water on the surface of the film, and is conducive to light transmission and temperature increase. Ordinary film surface spray drops, or regularly sprinkled on the surface of the film milk powder, soy flour, etc., can also reduce the amount of water on the surface of the film.
2. Cover the film. The cover film can generally increase the ground temperature at 10 cm by an average of 2 to 3°C, and the ground minimum temperature can be increased by about 1°C. At the same time, because the film is airtight, it can reduce the surface water evaporation and irrigation times, so as to achieve the purpose of reducing the air humidity in the shed.
3. Ridge cultivation. The high ridge surface area is large, receives more light during the day, and absorbs more heat from the air, so the temperature rises quickly, the soil moisture evaporates quickly, and the humidity is not easily high.
4. Reasonably water. Watering vegetables in winter, in order to achieve "five-watering and no pouring," that is, pouring water without pouring yin (watering on sunny days, no watering on cloudy days), watering before pouring (no watering before noon, no watering in the afternoon) , pouring a small water (do not water, not flood irrigation), pouring temperature do not cast cold (winter water temperature is low, when watering, first in the shed to warm up, until the water temperature and ground temperature close to then poured), pouring dark Not pouring (casting dark water, not pouring water). At the same time, we must vigorously promote drip irrigation, irrigation under the membrane and other new technologies.
5. Improve the method of application. In winter greenhouse pests and diseases in greenhouses, smoke or dust should be used as far as possible; if spray application is used, the number of controls and spray volume should be appropriately reduced to prevent excessive humidity in the greenhouse.
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, the humidity inside and outside the shed is very different, and the moisture is more easily discharged. At other times, it is necessary to extend the ventilation time as long as possible to ensure the temperature requirements. In addition, special attention should be paid to enhancing ventilation and dehumidification within 2-3 days after the watering of the greenhouse, 1-2 days after spraying the fertilizer (drug) on ​​the leaves, and before and after the rainy (snow) days and before and after sunset.
7. Rilled soil. After watering the ground, the ridges and ridge backs should be cultivated in time, and the capillary tube should be cut off to prevent the lower layer of soil from moving into the topsoil.
8. Manually absorb moisture. If the humidity in the shed is too high, some straw, wheat straw, ash or fine-dry soil may be sprinkled between the rows. Hygroscopic materials such as quick lime may also be placed in the shed to absorb moisture.
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