What causes eggplant stiff fruit?

What causes eggplant stiff fruit? Please introduce eggplant fruit symptoms after fruit expansion stops, the top of the fruit is sunken, the fruit hardens, loses edible value, or reluctantly expands, but the long fruit becomes a round fruit, and the round fruit forms a "black peel fruit" because half of the fruit is not inflated. Most of the fruit has no luster in the pericarp, there are gaps in the pulp, there are basically no seeds, and there are obviously few seeds in the barely inflated fruit. Cause 1, seedlings encounter high temperature, high humidity, lack of light or unreasonable matching of day and night temperature, etc., will form low-quality flower stalk thin, style short inferior flowers, this flower is easy to form stiff fruit. 2. Drought and lack of water in soil, low temperature, poor growth of plants and poor growth of slow seedlings will also provide conditions for the occurrence of stiff fruits. 3. Low temperature and high temperature barrier: when eggplant has a continuous temperature of less than 17 degrees Celsius or higher than 35 degrees Celsius before flowering, it will form sterile pollen or short-styled flowers, or poor pollen germination and pollen tube elongation, resulting in incomplete pollination and fertilization. it's possible to form a stiff fruit. When the concentration, dosage and time of flower and fruit protection agent are inappropriate or the plant growth is poor, it will also lead to the emergence of stiff fruit. 4. Malnutrition: the plant is malnourished, and the lack of nutrients needed for fruit expansion will also lead to abnormal fruit development. Occurrence regularity 1. There are different degrees of stiff fruit in the period of low temperature; low temperature, high humidity and low light will significantly increase the number of stiff fruit. 2. Stiff fruits are easy to occur in the early stage of protected and open field cultivation. 3. short fruit-shaped varieties are more likely to produce stiff fruit than long-fruit-shaped varieties. 4. Excessive nitrogen nutrition, especially excessive concentration of ammonium nitrogen, is easy to produce stiff fruit. In addition, if there is too much potassium, the vegetative growth of the plant is too prosperous, and the nutrients transported to the fruit are insufficient, and stiff fruit will occur. Preventive measures 1. To ensure the temperature conditions when raising seedlings. 2. When planting walls in the greenhouse, try to create temperature and light conditions conducive to the growth and development of eggplant. 3. Correctly master the application technology of flower and fruit protection agents. Click to get more eggplant planting techniques click to get more vegetable planting techniques