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Second, pay attention to keeping the temperature stable. The suitable ground temperature, rapid growth of roots, strong absorption capacity, eggplant will not appear due to the lack of black core phenomenon. Therefore, in the early spring and even cloudy days, we must often wipe the shed film to maintain a high transparency, in order to improve the shed temperature, promote the temperature rise, speed up the growth of the root system. The best use of straw in the operation of vegetables is to cover the ground, which has a significant effect on maintaining the ground temperature.
Third, we must strengthen ventilation and reduce the humidity inside the greenhouse. If the humidity in the greenhouse is too high, the transpiration of the plants will be weakened. Without transpiration, the root system will not be able to absorb enough nutrients. Nutrients will naturally not be able to supply the growth of the eggplant, which will cause the black heart of the eggplant. Therefore, in the vegetable shed in the early spring season, ventilation should be strengthened to reduce the humidity in the shed, especially when it is rainy and snowy. Under the premise of not lowering the temperature inside the shed, it is necessary to open the air outlet and increase ventilation and humidity.
Fourth, pay attention to extra-root fertilizer. When the eggplant is found to have a black heart, the foliar fertilizer containing potassium, calcium, magnesium, iron, zinc, and other trace elements may be sprayed depending on weather conditions. It is also necessary to use foliar sprays of foliar fertilizers to increase the robustness of plants and promote photosynthesis, so that the nutrients needed by the eggplant fruits can be constantly supplied upward to avoid or reduce the incidence of black heart disease.
First, pay attention to reasonable watering and fertilization, to avoid root injury. Especially in rainy days, the humidity in the shed is relatively high. It is necessary to avoid watering during this period. Watering on sunny days must be done before 10:00 am, and avoid watering at noon or afternoon to prevent the roots of vegetables from suddenly meeting cold water at higher ground temperatures. Fertilizer should be avoided as far as possible the application of fertilizers with high nitrogen content, because nitrogen is often present in the form of ammonium nitrogen at low temperatures, will have an antagonistic effect on the absorption of trace elements, resulting in eggplant lack of black heart. In winter, humic acid fertilizers can be applied, as well as biological bacterial fertilizers. The effects of cultivating roots and protecting roots are very good.