In the early stage of greenhouse wintering eggplant, it is in the low temperature and low light period. During this period, the roots have weak ability to absorb water and fertilizer, and are susceptible to abnormal symptoms due to lack of nutrients.
First, yellow leaves
1. Symptoms. The young leaves are bright yellow-white, the leaves are green, and rust-colored streaks appear on the middle and lower leaves.
2. Causes of the disease. More fertilizer, high humidity, soil acidity; excess manganese, inhibit ferrite absorption, leading to yellowing of new leaves.
3. Prevention and treatment methods. After the onset, the surface of the leaves is sprayed with 500 times of ferrous sulfate; magnesium hydroxide and lime are applied in the field to adjust the pH of the soil; potassium is added to balance the nutrition, which can satisfy or promote the supply of ferrite.
Second, the flower buds are not open
1. Symptoms. The ovary is not inflated, and the buds are not tight, which affects pollination and fertilization.
2. Causes of the disease. In the cold season, the field is short of water, the air is humid, the soil pH is above 7.5, the soil self-generated boron is reduced in effectiveness; there is excessive lime and calcium in the field, and the boron is induced to induce boron deficiency, which can cause the flower buds to not open for a long time.
3. Prevention and treatment methods. Foliar spray borax 700 times solution.
Third, the cracked fruit
1. Symptoms. The fruit is stiff and not swollen, the skin color is dull, and there are white streaks. After watering, it is cracked, with little growth and poor quality. When the eggplant skin is corked, it will crack when it is watered on a sunny day.
2. Causes of the disease. During the low temperature and low light period, the fruit is swollen, and the demand for nitrogen, potassium and boron is high. The relative demand for phosphorus is small. If the phosphorus input is too large, it will affect the absorption of potassium and boron, making the fruit seeds less fleshy and rigid.
3. Prevention and treatment methods. Phosphate fertilizer is mainly applied in the planting ditch. In the later stage, pure phosphorus is applied for 2 to 3 kg per acre. In the result period, potassium fertilizer is mainly applied.
Fourth, anti-decidation fruit
1. Symptoms. During the low temperature period, the lower leaves are yellowed and the young fruits soften and fall.
2. Causes of the disease. Zinc deficiency caused the decrease of gibberellin synthesis, and the joint between petiole and stem, fruit stalk and fruit was separated by auxin formation.
3. Prevention and treatment methods. Aging 秧 leaf surface spray zinc sulphate 700 times liquid to prevent falling and promote long.
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