Overwintering vegetables

First, insulation, temperature control with both hands to grasp insulation, mainly to protect the night temperature; temperature control, refers to control the temperature during the day. In the morning, as long as the temperature of the shed has not dropped by more than 1 to 2°C after the shed has been opened, the shed will be pulled out early; when the shed temperature reaches 28°C, ventilation should be started, but the bleed outlet should not be too large. Generally, the tuyere is opened by 10 cm. The gap can be. At noon, when the temperature of the shed is higher than 32°C, vents should be widened to prevent excessive temperature and affect the normal development of vegetables. In the afternoon, when the shed temperature reaches 22 to 24°C, the ventilation openings are closed; when the shed temperature reaches about 20°C, the grasshoppers are kept in time for insulation.

Second, extend the lighting time, improve the cold resistance of the crop In the winter when the sunshine time is short, you must add light, fill light, and promote the operation of vegetable photosynthesis. You can hang a reflective film on the back wall. On sunny days, it is possible to spray 500 times more natural vegetal internal fat, Shuofeng 481 and high-energy red potassium 1000 times through foliage, to improve the cold resistance and photosynthesis of the crop.

Third, timely release of air, dehumidify and ventilate the deep winter, the greenhouse closed for a long time, the humidity in the greenhouse is not only easy to cause disease, but also easily lead to carbon dioxide deficiency and harmful gas accumulation, is not conducive to vegetable growth. Therefore, strengthening ventilation is still an important measure for vegetable management.

Fourth, scientific watering, rooting strong, although the deep winter season, greenhouse vegetable growth is slow, the demand for water is not large, but not excessive water control. 2. The key to water management is to coordinate the relationship between watering and raising the temperature and reduce the humidity in the greenhouse. It is necessary to ensure the normal demand of vegetables for soil moisture and nutrients, but also to maintain the appropriate soil temperature, but also to minimize the humidity. Do less pouring, pouring ground, do not empty water. Combined with watering, each acre can be applied without deep plowing 2 ~ 3 kg, in order to enhance the permeability of the soil and reduce the surface water of the soil.

Fifth, scientific fertilization, root expansion According to the different stages of growth and development of vegetables and growth characteristics of the combination of water for fertilization, but do not only use nitrogen fertilizer when fertilizing, so as not to produce gas or root damage. For tomatoes, cucumbers and other vegetables that are in the final stage of their results, according to growing conditions, 20-30 kg of no-tillage fertilizer per acre, 20 kg of high-nitrogen-high-potassium compound fertilizer, and 2 kg of deep plowing can be applied per acre.

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