Eggplant is one of the important solanaceous vegetables. In the winter and spring of northern China, the price of eggplant on the market is very expensive. In recent years, with the improvement of greenhouse facilities and cultivation techniques, eggplant has occupied an important position in greenhouse cultivation. Due to the uneven management of various growers in recent years, eggplants are prone to some physiological obstacles in spring cultivation. In this article, microbial microbial fertilizer expert, Gemba, now briefly describes the prevention and control measures for these physiological disorders: 1. Spring eggplant nutritional disorders symptoms There are many kinds of nutrients needed in the eggplant breeding process. Improper fertilization can easily lead to malnutrition, poor growth and development, and affect yield. The most effective way is to apply enough base fertilizer to ensure the supply of later elements, especially trace elements. In addition, we also recommend users to use organic fertilizers that are fermented by microbial fermentation fertilizers such as Kumba Organic Fertilizer. If the following symptoms of eggplant appear as follows: nitrogen deficiency will cause yellowing of the lower leaves of the plant; if there is too much nitrogen, the heart and leaves of the top of the plant will be dark green and the phosphorus deficiency will be purple. Eggplant has a large demand for potash fertilizer. Excessive nitrogenous fertilizer and lack of phosphorus and potassium fertilizers will promote vegetative overgrowth of plants, poor flower bud development, short stud flower, increase in the number of flower in the middle column, and even flowering and iron deficiency may cause yellowing of the heart of the plant. Albino. Boron deficiency bends the top new leaf into a hook shape. The appearance of umbilical rot in fruit is a manifestation of calcium deficiency. Manganese deficiency or excessive manganese caused by excessive fertilizer may cause rust on eggplant fruits. In addition to diagnosing the nutritional status of eggplants through plant morphology, chemical analysis can be performed on conditional conditions so that the nutrients needed by the crop can be supplied in a timely manner and the loss of production can be minimized. Nitrogen and potassium fertilizers can be applied to the soil or outside the roots, and trace elements are generally used for top dressing. In soilless cultivation, the missing elements can be directly added to the nutrient solution. 2, spring eggplant planting moisture problem Eggplants are weak in drought and require sufficient water for growth. Soil drought can cause poor plant growth, poor floral bud development and short studs. Water shortage during fruit enlargement will form dull fruit and affect quality. Therefore, the eggplant fruit should be supplied with sufficient moisture during the expansion period. On the other hand, if the water is suddenly absorbed after the drought, the eggplant fruit will crack due to rapid expansion. 3, spring eggplant planting temperature problem The optimum temperature for the eggplant stage was 25 to 30°C. The minimum temperature required for pollen germination and pollen tube elongation was 17°C. Pollen grains below 15°C did not germinate at all. After the pollen germinates on the stigma, the pollen tube takes 6 hours to 2 days to enter the ovary for fertilization. Therefore, even if the daytime greenhouse temperature is suitable for the germination of pollen grains, the nighttime low temperature is still not conducive to the elongation of the pollen tube, and the eggplant eventually fails to be normally fertilized, resulting in flowering or the formation of parthenocarpy fruit. As the temperature is too low, the eggplant has poor flower development, stamens are degraded, and the corolla does not normally expand and open. Eggplants in spring protection greenhouses can be heated in greenhouses with greenhouse warmers at low temperatures or treated with hormones to prevent flowering and produce stale fruit. 30-50 ppm of tomato seedlings can be used for flowering or spraying, or 20-3Oppm of 2,4-O D smeared flowers and flower stalks to promote the development of fruit enlargement. 4, spring eggplant plant lighting problems In general, the average illuminance in winter greenhouses is only 1-5 million lux, and the average illuminance in March-April is 2-30 thousand lux. Most of the eggplants cultivated in spring are protected from light. Insufficient light at the seedling stage makes the seedling leaves grow bigger and thinner, and the leaf color is lighter, and it is easy to form leggy seedlings. Insufficient illumination also delays flower bud differentiation, poor flower development, short stature formation, and falling flowers. The color of the eggplant fruit is an important part of the eggplant's commercial nature. If the light is insufficient, the coloration of the eggplant is not good. The production density should be paid attention to and the reasonable pruning and picking should be performed. In short, the eggplant cultivated in protected areas in winter and spring should try to use as much light as possible. At the same time, breeding workers should choose to breed new eggplant varieties that are resistant to weak light. Merchants with higher color requirements can use the sweetened fruit coloring agent to promote fruit coloring. This is a microbial inoculant that promotes better utilization of photosynthesis sugars for plant coloration, thereby making the eggplant taste and appearance better. For details contact Beijing Huaxia Kangyuan Technology Co., Ltd. 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