In winter, when uncovering and covering the grass thatch is not suitable, some vegetable farmers only pull the grass thatch one hour after sunrise in the morning in order to maintain the temperature in the shed, and the time of putting the grass thatch in the afternoon is too early, resulting in too short time for the vegetables in the shed to receive light. There are fewer photosynthetic products and lower yields. Not to pull the grass thatch on cloudy days, especially when it is continuously cloudy, many vegetable farmers only consider to keep warm in the winter greenhouse, but do not consider the aspects such as receiving light, ventilation and dehumidification on cloudy days, so they do not pull the grass thatch. As a result, Often cover yellow vegetables.

In the warm winter greenhouse, there is no cold-proof ditch, and the temperature in winter is low. The soil around 2 meters in front of the shed is under low temperature for a long time, which affects the normal growth of vegetables and has more deformed fruits. Vegetable farmers can dig an east-west ditch one meter from the front of the shed, the same length as the greenhouse, half a meter wide, and the same depth as the local frozen soil layer, and then spread a layer of film in the ditch, and then fill it with dry Straw, so that it can play a very good thermal insulation effect. In the warm winter greenhouse in the 34-39 degree north latitude area, grass thatch can be spread on the walkway in front of the shed, which will also have a thermal insulation effect.

Failure to manage causes flash seedlings and dead trees. Many vegetable farmers uncover the grass thatch on a sunny day after a continuous cloudy day. This approach is wrong. It is very easy to cause the vegetables in the shed to flash seedlings, leading to the phenomenon of wilting and dead trees. Therefore, it is recommended that the measures of "revealing grass and thatch and spraying warm water" can be used to prevent vegetable seedlings from flashing after a continuous cloudy day. That is, do not open the whole shed when removing the grass thatch, but open the other bed apart. In this way, after uncovering the grass thatch, the light in the shed will be illuminated from one bed to the next. The vegetables corresponding to the uncovered thatch will be exposed to direct and strong light, while the vegetables that are not drawn will receive scattered light. Vegetables that are exposed to strong light Generally, wilting will appear after pulling apart the grass thatch for 10-15 minutes. At this time, spray the plants with warm water of about 20℃, and then put down the grass thatch, and reopen the grass thatch that has not been opened for the first time. , Let the vegetables that have not received strong light also receive strong light, and then use the same method of spraying warm water to promote their normal growth. Repeat this several times. Generally, after two hours in the afternoon, check the ground temperature in the shed. If the temperature reaches 20 ℃, the vegetables will no longer show symptoms of wilting after seeing strong light, and then all the grass thatch can be uncovered. After the next day, resume normal management after a sunny day.

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