First, pay attention to reasonable watering and fertilization to avoid root injury. Especially in rainy days, the humidity in the shed is large, and it is necessary to avoid watering during this period. Watering on sunny days must be carried out before 10:00 am. Do not water at noon or afternoon to prevent the roots of vegetables from suddenly encountering cold water at higher ground temperatures. Fertilization should try to avoid the application of fertilizers with excessive nitrogen content. Nitrogen is often present in the form of ammonium nitrogen at low temperatures, which will antagonize the absorption of trace elements and cause the eggplant to be deficient in black hearts. In winter, humic acid fertilizers can be applied, and biological fertilizers can also be applied. The root-protecting effect is very good.
Second, pay attention to keep the ground temperature stable. The ground temperature is suitable, the root system grows fast, the ability to absorb fertilizer is strong, and the eggplant will not appear black and white due to lack of quality. Therefore, in the early spring and even cloudy days, the shed film should be wiped frequently to maintain high light transmission, so as to increase the temperature inside the shed, promote the temperature rise, and accelerate the growth and development of the root system. The operation of the vegetables is preferably used as a straw covering, and the effect of maintaining the ground temperature is remarkable.
Third, we must strengthen ventilation and reduce the humidity inside the shed. If the humidity in the shed is too large, the transpiration of the plant will be weakened. Without transpiration, the roots will not be able to absorb sufficient nutrients, and the nutrients naturally cannot supply the growth of the eggplant, thus causing the black heart of the eggplant. Therefore, in the early spring season, the vegetable shed should be ventilated to reduce the humidity inside the shed, especially in the rainy and snowy days. Under the premise of not reducing the temperature inside the shed, the open air vent should be pulled to enhance ventilation and drainage.
Fourth, we must pay attention to the external fertilizer. When the eggplant is found to have a black heart, foliar fertilizer containing various trace elements such as potassium, calcium, magnesium, iron, and zinc may be sprayed under weather conditions. It is also necessary to use the leaf surface of the leaf surface to enhance the plant's health and promote photosynthesis, so that the nutrients needed for the eggplant fruit are continuously supplied upwards, thereby avoiding and reducing the occurrence of eggplant black heart disease.
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