In the process of cultivation, it is often called cold damage. How can the growth of eggplant be seriously affected by low temperature.
1. Near ground coverage
In greenhouse cultivation, film, straw curtain, thermal insulation quilt, plastic film and other materials can be combined to cover, so as to achieve the purpose of heat preservation. Because different insulation materials have different heating effects, generally every additional layer of film can increase 2-3 degrees, reduce heat loss by 30% - 50%, and cover the second layer can increase the temperature by 6 degrees. If it is open field cultivation, we can use plastic film near the ground to cover the seedlings in the early stage, so that the whole seedling is under the plastic film, which has better heat preservation effect.
2. Heating supplement
Before the cold current comes, only relying on the greenhouse and multi-layer covering conditions can not meet the temperature requirements of eggplant, so it is necessary to take heating measures immediately. According to its own conditions, various means can be taken to supplement heat, such as flue heating, electric hot line, small water heating boiler and so on. But must not use the way of open fire fumigation, in order to avoid smoking seedlings, but also affect the safety of life. If there are geothermal, power plant waste heat and other conditions, the pipeline can use these heat sources to improve soil temperature.
3. Sowing and seedling raising
When sowing, we should determine the sowing time and planting date, try to choose the cold tail and warm head of the windless sunny day to sow or plant, to ensure that the seedlings can be safe emergence and survival. It is recommended to raise seedlings in nutrient bowl, because the black plastic nutrition bowl has the function of absorbing heat in the daytime and keeping warm at night. The temperature difference between the general nutrition bowl and the outside temperature is 20 degrees. It can ensure the growth of seedlings free from freezing damage, and it can also carry out low temperature hardening to enhance the cold resistance.
4. Foliar spraying fertilizer
In the low temperature environment, the root absorption capacity of seedlings is poor, so it is necessary to spray photosynthetic micro fertilizer on the leaves to ensure that the seedlings are lack of nutrients. At the same time, rice vinegar can also be sprayed on the leaves, which can play the main role of antibacterial and insect repellent. The mixed use of rice vinegar, white sugar and superphosphate can increase the sugar content in mesophyll, improve the leaf hardness and cold resistance. In the low temperature, we should pay attention not to any growth regulator in the greenhouse, so as to avoid the cold resistance of the seedlings.
The above is the prevention and control methods of eggplant low temperature barrier, hope to help you, want to know more related knowledge, please pay attention to our encyclopedia Planting net 。