The key conditions for the occurrence of diseases are mostly high humidity. In winter, there are many cloudy and rainy days, long time for sheds, and it is very easy to form high humidity in the sheds. This creates favorable conditions for the occurrence and development of various diseases. Therefore, it is necessary to reduce the number of diseases in winter. wet.
(1) Control watering. In winter, in order to reduce the humidity in the shed, the number of waterings should be reduced as much as possible. However, the number of watering reductions mentioned here is not waterless, and some farmers do not water the wrong way, at least to ensure that they can meet the crops. Growing needs. Reduce the amount of water used to prevent excessive watering during the growth period to reduce ground temperature and increase air humidity. If you need watering during the growth period, you should pour small water and avoid flooding.
(2) Cover no drip film. Due to the difference in internal and external temperatures, condensation in the greenhouse film is unavoidable. The surface of the common plastic film has a uniform distribution of dew condensation, and therefore, the dripping surface is large and the air humidity is increased. After the drip-free membrane was used, although the surface was dew, the water droplets flowed down the membrane surface, and the drip surface was small, increasing the air humidity was not serious.
(3) ridge cover film. The ridge cover film can maintain soil moisture, reduce evaporation, and reduce air humidity. Irrigation under the membrane can reduce the air humidity.
(4) Proper close planting. Density within the greenhouse should not be too dense to facilitate ventilation and reduce air humidity.
(5) Strengthen the cultivator loose soil. Before covering the mulching film after planting, timely cultivating loose soil after watering can reduce evaporation, maintain soil moisture, reduce the number of watering, and reduce air humidity.
(6) Master watering time. Watering in the cold season should be performed on a sunny morning. Close the greenhouse immediately after the watering, increase the temperature, increase ventilation at noon and afternoon, and discharge moisture.
(7) Reasonable ventilation. Under the premise of ensuring proper temperature, timely ventilation and discharge of moisture can effectively reduce the relative humidity of the air in the shed.
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