The eggplant cultivated in the greenhouse is initially in the low temperature and low light period, and various physiological obstacles are prone to occur. According to its causes, corresponding prevention measures should be taken:
1. Yellow leaves of young leaves. The young leaves are fresh yellowish white, the leaf tip remains green, and rust-colored streaks appear on the middle and lower leaves; multi-fertilizer, high-humidity, soil acidity or manganese nutrient excess, inhibiting ferric absorption, etc., easily lead to yellowing of new leaves. Control measures: After the onset, the surface of the leaves is sprayed with 500 times of ferrous sulfate (not too heavy); the field is applied with magnesium hydroxide and lime to adjust the pH of the soil; potassium is added to balance the nutrition to meet or promote the supply of ferrite.
2. The flower buds are not open. The ovary is not inflated, and the buds are not tight, which affects the pollination and fertilization. In the cold season, water shortage, air humidity, soil pH value above 7.5, the effectiveness of boron in the soil is reduced; excessive lime and calcium in the field, induced plant boron deficiency, can cause the flower buds to not open for a long time. Control measures: spray borax 700 times liquid or amino acid peptide pollinator on the leaf surface.
3. The fruit is cracked. The fruit is stiff and not swollen, the skin color is dull, and there are white streaks. After watering, it is cracked and the length is not big. When the eggplant skin is corked, it will crack when it is watered on a sunny day. Control measures: 2 to 3 kg of pure phosphorus per acre at the end of planting; potassium fertilizer is mainly applied in the final stage.
4, fallen leaves and fruit. During the low temperature period, the leaves of the lower leaves are yellow and fall off, and the young fruits in the high-humidity period soften and fall. When the temperature is too low, the nitrogen and phosphorus fertilizers are applied excessively to make the soil concentration high, and the plants will age due to long-term nutritional imbalance, which is the sequela of the decrease of gibberellin synthesis caused by zinc deficiency. The joint between the petiole and the stalk, the stalk and the fruit is separated by the lack of auxin. Control measures: aging 秧 leaf surface spray 700 times of zinc sulphate, or 1 kg of zinc sulphate per acre, can also spray green waves on the leaf surface and other nutrients containing zinc to prevent growth.
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