In the winter, when the grass cover is not covered, some vegetable farmers open the grass cover in the morning one hour after the sunrise in order to maintain the temperature in the shed, and the grass cover is released too early in the afternoon, causing the vegetables in the shed to receive light for too short a time. There are fewer photosynthetic products and lower yields. Do not pull grass moths on cloudy days, especially on cloudy days, many vegetable farmers only consider heat preservation in winter greenhouses, but do not consider that they also need to accept scattered light, ventilation and dehumidification on cloudy days, so do not pull grass moths. Often cover yellow vegetables.
There is no cold-proof ditch in the winter warm greenhouse, and the temperature is relatively low in winter. The soil about 2 meters in front of the greenhouse is under low temperature for a long time, which affects the normal growth of vegetables and has more deformed fruits. Vegetable farmers can dig a cold-proof trench one to one meter away from the front face of the shed, as long as the shed, half a meter wide, and as deep as the local frozen soil layer. Firstly, lay a thin film in the ditch, and then stuff it with dry Straw, so it can play a good thermal insulation effect. The winter warm greenhouse in the area of ​​34 ~ 39 degrees north latitude can be covered with grasshoppers on the walkway in front of the greenhouse, which will also have a thermal insulation effect.
Will not manage to cause dead seedlings of flash seedlings. Many vegetable farmers uncover grasshoppers in the usual sunny days after a sudden cloudy turn, this approach is wrong, and it is very easy to cause seedlings of vegetables in the shed, which will lead to the phenomenon of dead seedlings. Therefore, it is suggested that the measures of "grassing grass and spraying warm water" can be used to prevent the seedlings of vegetables after the cloudy sky is clear. In this way, after the grasshopper is lifted, the light in the shed will be illuminated one bed at a time. The vegetables corresponding to the grasshopper will be exposed to strong direct sunlight, while the vegetables that have not been drafted will receive scattered light, and the vegetables under strong sunlight. Generally, the wilting phenomenon will occur after 10 to 15 minutes of opening the grasshopper. At this time, the plant should be sprayed with warm water at about 20 ° C in time, and then the grasshopper is lowered to re-open the grasshopper that was not opened for the first time. Let vegetables that have not received strong light also receive strong light, and then use the same method of warm water to promote their normal growth. Repeat this several times. Generally, check the ground temperature in the shed two hours after noon. If the temperature reaches 20 ℃, the vegetables will not show wilting symptoms after seeing strong light. Wait until the next day to resume normal management after a sunny day.
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