The recent haze weather is relatively high, which is extremely unfavorable for the growth of greenhouse vegetables, which can cause poor vegetable development in the greenhouse and increase the severity of disease and reduce yield and quality. In order to prevent the adverse effects of haze weather on shed vegetables, vegetable farmers should take the following remedial measures:
First, improve lighting conditions in the shed
Firstly, the shed film should be kept clean, the water droplets in the film should be eliminated in time, dirt, grass clippings and other dirt on the shed film should be removed, and the transparency of the shed film should be maintained; then the light was exposed, as long as the temperature did not drop after demolition, or decreased. In the range of 2°C or less, timely expose the vegetables to see the light, and let the vegetables meet the light for 1-2 hours in the high temperature period around noon. Third, remove the old leaves, diseased leaves, and dead leaves by pruning and removing the leaves. Acquire mature or near mature fruits and other comprehensive measures to improve lighting conditions among vegetable groups. Fourth, use reflective measures such as floor covering, reflective film on walls, white coating on inner walls and columns, and other measures to fully utilize reflected light. Artificial light, fluorescent lighting, etc. can be used to reduce the impact of lack of light on the vegetables caused by hazy weather.
Second, reduce the humidity in the greenhouse
The humidity in the shed is generally high and the watering should be stopped. When the temperature in the shed is appropriate, proper ventilation should be maintained to keep the air flowing and reduce the humidity. If the soil is dry and non-irrigated, it is necessary to pour as little water as possible or to adopt a method of dark pouring under the membrane to prevent the humidity in the greenhouse from increasing further and inducing the occurrence of disease.
Third, comprehensive prevention and treatment of diseases
Continuous haze and low-temperature weather result in high humidity in the shelter, which is conducive to the occurrence and prevalence of diseases such as gray mold and downy mildew. The prevention and treatment should be mainly prevention. When using drugs, we can use aerosol control to reduce the humidity in the greenhouse and improve the control effect. If the application of spraying method, but also to reduce the number of control.
Note that when the continuous haze days suddenly become clear, when the light is strong at noon, cover some grasshoppers at intervals and uncover them in the afternoon, or slowly expose the light, to prevent the leaves from wilting due to strong light.
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