The north will face the storms and winds.

From the 21st to the 24th of this month, most areas in the north may have a temperature drop of 4-8 °C. In the northern part of North China and parts of the northeast, there will be a temperature drop of about 10 °C, accompanied by a northerly wind of about 5, northeastern Inner Mongolia, northeastern northeast. There are small to medium snow, local snow and snow. All localities need to strengthen the adverse effects of defensive cooling, strong winds and rain and snow.

Cooling and precipitation, continuous low temperature, low light, may have a serious impact on the vegetables and fruits in the greenhouse. The production response measures are as follows:
(1) Do a good job in greenhouse insulation: winter rainy and snowy weather, the lack of light and heat in the greenhouse, making it difficult to heat insulation in winter greenhouses. 1 Multi-layer cover insulation technology can improve the night temperature inside the greenhouse and effectively overcome the low temperature obstacles in winter. Multi-layer cover insulation with "three sheds and four membranes", that is, greenhouses + medium sheds + small sheds + mulch is a cost-effective insulation measure. 2 Cover the cover material. The inner shed is covered with insulation covering materials such as straw curtains, sunshade nets, etc., and the apron can also be covered. 3 control the ventilation time. Ventilation in the morning and cover the membrane in the afternoon. 4 In case of strong cold air, it can be heated by electric heating or other facilities.

(2) Strengthen the management of greenhouses: 1 In the process of production management of vegetable greenhouses, it is necessary to strengthen the management of light. Under the premise of conducive to heat preservation, the cover should be exposed as soon as possible, the light should be seen more, the light receiving time should be extended, and the light should be increased as much as possible. 2 Add carbon dioxide. The application of carbon dioxide fertilization technology to increase the carbon dioxide content is also conducive to enhancing the cold resistance of plants. 3 should pay attention to the occurrence and spread of vegetable diseases and gray mold. 4 cut off the dead branches. Cut the severely damaged stems and leaves in time to avoid tissue mildew lesions and induce disease.

(3) Note: 1 After the continuous low temperature, rain, snow and snow weather, the weather should pay attention to the greenhouse to cover the curtain in time to prevent the plant from dying and dying. If the leaves are normal, gradually increase the number of grass curtains until they are fully uncovered; if any wilting occurs, cover them with several straw curtains in time to allow the crops to adapt. 2. After the long-term yin turns clear, the wind should be repeatedly released, so that the temperature difference between the room and the inside and outside is close to the previous few days. At the same time, the greenhouse is slowly warmed up to avoid a sudden rise in temperature, causing the plants to wither and die. 3, when ventilation should pay attention to prevent the wind from rushing, and the door should be placed to block the object, prevent cold wind from blowing, causing the plant to wither and die.

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