Greenhouse pathogens are generally hi wet. Vegetables often cause disease when wetted. Greenhouse vegetable production should pay attention to reduce the humidity in the greenhouse, as follows: (1) Use EVA film. The adoption of EVA membrane can reduce the loss of natural light, improve the clarity in the shed, reduce the relative humidity of the air, promote the healthy growth of vegetable crops, and increase the resistance to pests and diseases. (2) ventilation. Ventilation is carried out around noon during the day and the vents are at the junction of the top membrane and the skirt of the greenhouse. The air outlet should be small and large first. In sunny days, the ventilation time may be appropriately increased, and ventilation may be properly opened in the morning as early as possible; in the rainy days, ventilation of the greenhouse may be opened on the south side. When ventilating, prevent cold air from blowing in directly and cover the film before 5 o'clock in the afternoon. (3) Field coverage. Covering the surface with a plastic film and covering rice straw and other objects in the aisle can suppress the evaporation of soil moisture and reduce the air humidity in the greenhouse. When the coverage caused by water and fertilizer management is inconvenient, drip irrigation under the membrane can be used. (4) Water-free control. It can be controlled by swatch trapping, aerosol and dust agents.
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What should I do if greenhouse vegetables are wet?