1. The following measures can be taken when encountering severe cold, multiple layers can be covered, sheds can be set in the shed, and a layer of film can be covered on the grass rake to increase the effect of heat preservation; cold grooving trenches can be dug outside the shed beforehand. Internal temperature increased by 2-3 degrees Celsius.
2. If you encounter continuous shade weather, if the temperature is not too low, you can uncover the straw curtain. Hanging a light curtain on the back wall of the greenhouse will also play a role of lightening and warming on cloudy days. In order to increase the ground temperature, it is necessary to cover the mulch early in winter when there are more cloudy days, which can reduce the occurrence of low-temperature freezing damage. In winter, the temperature in the greenhouse is kept above 12 degrees Celsius. When the temperature is too low, warming measures can be taken.
3, encountered snowfall weather, during the day when the snow can not cover grasshoppers, snow immediately after the stop to sweep the snow on the shed, in order to strengthen the insulation, cover the afternoon, and then covered with a layer of film on the grasshopper. Snowfall at night and snow should be promptly removed after the snow stopped the next day in order to keep the grasshoppers dry. When it is clear that it is clear and clear after continuous cloudy snow weather, it should be separated or pulled first by one-third. At the same time, observe the changes in the seedlings and find the wilt. Immediately cover the grass and restore it before pulling back. shed".
4, after the freezing of the remedy. After being frozen, the temperature in the shed must be slowly increased. It is not possible to immediately close the shed to increase the temperature, so as to avoid necrosis of vegetable tissues due to a sudden increase in temperature. The frozen fruits and stems and leaves must be cut in time to avoid tissue moldy lesions.
5, do a good job of routine management. Timely uncovering the cover. About 70% of the emergence should promptly reveal the cover, so that seedlings gradually see light. Covers should be re-covered at night to prevent freezing.
6, timely ventilation and humidity. As the temperature inside the nursery bed and outside air temperature increase, it is necessary to increase the ventilation and control the humidity in the nursery facilities.
7, to prevent seedlings leggy. Can be inhibited by spraying chlorpyrene, chlormequat can enhance seedling disease resistance and cold resistance, but the concentration is easy to cause aging seedlings.
8, strengthen the management of temperature and light. In terms of lighting management, facilities should use insulation and light-transmitting covering materials as much as possible. Multi-functional composite films are recommended.
9, in the temperature management, should be based on different vegetables, different growth period of the different requirements of temperature, appropriate regulation and control in the winter to do the work of the cold insulation of the work to avoid sudden cooling on the adverse effects of nursery and vegetables.
10, timely control of pests and diseases. During the growth of seedlings, vegetables are prone to damping-off, blight, and gray mold. In the prevention and control of diseases, a prevention-based strategy should be adopted. It is recommended to conduct a chemical control treatment once a week, and it is recommended to use a fumigant instead of a spray control for overcast days.
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