In snowy days, greenhouses lack of light, low temperature, high relative humidity of the air, and the photosynthetic efficiency of vegetables declines. Physiological problems such as falling flowers, falling buds, and fruit setting difficulties are easy to occur. At the same time, root growth of vegetables is inhibited, which affects the absorption of water and nutrients, and the color of vegetables and leaves. Yellowing, the comprehensive resistance decreased significantly.
Snow days countermeasures
In the beginning of the winter, sleet weather often occurs. If the minimum indoor temperature is above the minimum temperature required for vegetable growth, you can leave the grasshopper at the same time. At the same time, you must use an old shed film to cover the grasshoppers so that the grasshoppers will not get wet. Large greenhouse load reduces greenhouse service life. If the indoor temperature is lower than the minimum temperature required for vegetable physiology, we must cover the grasshopper and cover the grass with an old film to prevent rain and snow. If moderate to heavy snow occurs, remove it as soon as possible to prevent the snow from melting and soaking the grass.
Before the arrival of the storm, it is necessary to check the fixing of the plastic film. The lamination line or pressure bar must be firmly fixed and the grass bead must be tightly closed. Such weather may be expedited as soon as possible, but it must be emphasized that, in the case of continuous snow, the time for exposing each day cannot be less than 4 to 5 hours. Although this weather does not have direct light, it can be warmed by scattered light, and there is a short-term temperature drop after exposure. However, after 30 hours, the temperature is usually 3 to 4°C higher than that of non-disclosure.
Cold weather measures
For the prevention of cold weather, the most active measure is to construct a greenhouse that is suitable for local characteristics, with rapid temperature increase, heat storage and good insulation.
In terms of cultivation, the following technical measures can be taken: First, when the cold current is coming, increase the number of grasshoppers, add another layer of grasshoppers to the front window; second, clean the sheds, and remove the dust on the surface of the film with a mop every day; Properly advance 0.5 to 1 hour to release the earthworm; Fourth, add a layer of greenhouse film to the front window of the greenhouse; Fifth, fill the fire-fighting ditch with enough firewood to prevent a large amount of heat transfer from the front window to the outside.
Even cloudy countermeasures
Even the low temperature and weak light pose a great threat to winter vegetables, and it is the “first enemy†of over-wintering production of thermophilic vegetables. In such a weather, plant growth is stagnant, leaves yellow, and aboveground and underground parts are seriously affected.
Without affecting the temperature requirements of vegetables in solar greenhouses, uncovering grasshoppers should be carried out as normal as possible, so that vegetables can use the scattered light of cloudy days to maintain their lives and cannot be uncovered for several days. Even when cloudy weather hits the cold stream and the temperature in the greenhouse drops, you can use the method of hanging the light curtain to increase the light in the northern part of the greenhouse. You can also add a small shed when the height of the seedlings is low. In the management of the greenhouse, the indoor night temperature should be 2~3°C lower than the sunny day. Because the light in the cloudy day is weak and the photosynthetic products are small, if the night temperature is too high, the respiratory depletion of the crop will increase, resulting in insufficient nutrition and various physiological disorders.
Even after the storm is over, it must not be unveiled at the same time and in full, but it should be unveiled in successive intervals. When the sunlight is strong at noon, we can put the grasshopper down. We call it "back to the sky" and open it when the sunlight is weak. When the temperature is increased, the use of high temperature at noon can be released for a short time, the amount of wind should not be large, in order to facilitate the emission of harmful gases. On the first day of a long-cloudy sunny day, foliar fertilization, nutritional supplements, and plant resistance to disease and cold are needed.
Erythritol,Erythritol Keto,Powdered Erythritol,Baking With Erythritol
Ningxia Eppen Biotec CO.,LTD , https://www.nxeppen.com