If you want to have high vegetable prices, you must plant anti-seasonal vegetables, anti-seasonal vegetables can better meet the supply needs of the market, improve economic benefits, greenhouse planting is a common technology of anti-seasonal vegetables, it has better thermal insulation performance.
As the weather is getting colder, the north has snowed, the normal management of various vegetables will also be disrupted by heavy snow, this time the greenhouse vegetables have entered a critical period, for the temperature control of greenhouse vegetables in winter, different regions have different statements, resulting in many friends in the planting process, encountered greenhouses do not know how to keep warm, do not know how to accurately measure the average temperature of greenhouses, when to lift and lower the quilt is the most appropriate and other issues of trouble.
We invited a teacher known as "Guo Degang of the Vegetable Industry", Jia Xu, technical director of the Jingyun Xinyue Plant Protection Team in Xianyang City, Shaanxi Province.
When to liter the quilt
Teacher Jia Xu found in the process of technical guidance to farmers in the greenhouse that many growers in the greenhouse to lift and lower the quilt time is relatively vague, the common two bases are 1, look at the time, to eight o'clock, think it is time to rise up, 2, is blindly conformist, others how to do also follow how to do. In fact, these two things are wrong, and the correct basis for lifting quilts should be to look at the temperature.
First of all, go to the curtain in the morning, after lifting it, enter the shed and look at the temperature gauge for a few degrees. If the curtain rises within ten minutes, the temperature drops by 1 to 2 degrees is the most appropriate; if the temperature drops a lot, it means that you unveiled it early, which will affect the growth of vegetables; if the temperature does not fall, it will directly rise, it means that you rise late, there is no harm in rising late, it will affect it This day is less than 20 minutes of light, so the best time to judge the quilt is to look at the temperature.
When to open the air outlet
Autumn and winter temperatures are low, after the grass curtain is covered at night, the vegetables in the greenhouse stop photosynthesis, only respiration releases a large amount of carbon dioxide, while the microbial decomposition of organic matter in the soil will also release carbon dioxide, so when opening the air outlet, pay attention to the following points:
1. When lifting the quilt for the first time in the morning, do not open the air outlet, because the concentration of carbon dioxide in the shed is the highest at this time.
2. From 12:30 to 2:30 noon, the air outlet raises the temperature of the greenhouse to 30 degrees to 32 degrees, which can inhibit the spread of pathogens.
3. Do not suddenly open the air outlet, the sudden alternation of hot and cold will cause flash seedlings.
Therefore, raise the curtain to let the vegetables see the light, the time control is about an hour, let the vegetables absorb carbon dioxide, convert it into photosynthetic products, an hour later, the carbon dioxide in the shed is absorbed, this time you can open the air outlet to exchange air to let the air in, the carbon dioxide in the air can indirectly supplement the carbon dioxide, do not remember, do not just raise the curtain to open the air outlet, so it is easy to let go of the temperature, the width of the seal is 5 cm is enough, if the opening is larger, it is easy to be cold.