In early spring or wintering, the cultivation of vegetables in protected areas often encounters severe weather, such as rain, snow, even cloudy days, and low temperature, which not only seriously affect the growth of plants, but also have a great impact on the flower bud differentiation of fruits and vegetables, and cause fruit and fruit drop. Malformed fruit has a great influence on the overall yield of vegetables. If the management is not good, it can lead to the production of a crop of vegetables. Therefore, if farmers want to grow good vegetables, they must strengthen the management of low-temperature and even cloudy vegetables.
Smoke smoked sheds to prevent victimization. The normal use of aerosols in greenhouses can achieve good results within 7 to 8 hours. If the smokers are exposed for a long time, it is easy to cause damage to the vegetables. The leaves are yellow and dry and affect the normal growth of the fruit. The vegetable farmers must pay attention to listening to the weather forecast when they are smoked, so as to ensure that the ventilation can be exposed the next day. If the weather is bad the next day, it is best not to smoke the shed.
Even cloudy days pay attention to moisture, see scattered light. The humidity of the air is the source of all diseases. In the weather, vegetables are easy to get sick. Therefore, attention should be paid to ventilation and humidity. Many vegetable farmers only pay attention to keeping warm and do not dare ventilate and ventilate. This is wrong. Should be based on the actual situation before and after noon from 10 to 11 hours of dehumidification, if the temperature dropped severely, then close the vents, which means that whenever there is a chance, we must ventilate and drain. The weather is weak and the temperature in the greenhouse is low, and the temperature in the greenhouse is low. The plants will be easy to grow and the plants will grow weak. After sunny days, the plants will easily appear physiological wilting, and the most serious cause dead trees. A qualified vegetable farmer can turn on the fill light and have excellent results.
Pay attention to disease prevention. Before the onset of disaster weather, it is necessary to spray pesticides and protect vegetables in a timely manner to prevent major diseases, such as the morning and the night blight, Botrytis cinerea, and downy mildew diseases. However, ensure that the leaves remain dry after administration. For a long period of time, the spraying of foliar sprays was irrational. The main choices were aerosols and dusting agents to prevent disease. Pay attention to cover film. Rain and snow weather should cover the film in time to prevent the grass lice from being wetted by rain and snow. Once the grass rake is splashed with rain and snow, it will be difficult to dry throughout the winter, which not only affects the insulation effect but also greatly reduces the service life of the grass rake. .
After the weather is fine, it cannot be immediately dispelled and used. After sunny days, the transpiration of plants is strengthened, but the root activity is short-term slow, and the short-term supply of water is insufficient, which easily leads to wilting of plants. Therefore, do not open the grasshopper completely to cover the shade. If the plants are wilting, you can spray the carapace quickly. Sulphur + magnesium sulfate eases. It is also unscientific to take medication immediately after the weather. Because the plants grow weak, the pores have not yet been fully opened, the effect of medication is not good, and it is easy to cause phytotoxicity, and it should be used after drying for at least half a day.
After the weather is clear, take care to take root. After a long period of cloudy days, the growth of roots is hindered. After sunny days, do not immediately apply cold fertilizers such as compound fertilizers. Pay attention to compounding root-causing fertilizers to quickly restore plant growth.
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