First, yellow leaf disease
The young leaves of eggplant are yellowish-white, with green leaves on the tip and rust-colored streak on the lower middle leaves. Fertilizer, high humidity, soil acidity, or manganese nutrient excess, inhibition of ferritin absorption, etc., easily lead to new leaf yellowing. Spray ferrous sulfate 500 times on the surface of the leaf; apply magnesium hydroxide and lime in the field to adjust the pH of the soil; supplement potassium to balance nutrition and meet or promote ferritic supply.
Second, buds are not open
The eggplant ovary does not swell, and the buds do not open tightly, affecting the pollination and fertilization. In the cold season, the fields are short of water and the air is humid. The pH of the soil is above 7.5. The effectiveness of boron in the soil is reduced. Excessive lime and calcium in the field may induce plant lack of boron, which can cause buds to remain open for a long time. Spray borax 700 times or amino acid polypeptide pollinator on leaf surface.
Third, fruit cracking disease
The eggplant's fruit is stiff but not inflated, the sponge tissue is tight, the skin color is dull, and there are white stripes. After watering, it becomes cracked fruit, which is not long and has poor quality. After the eggplants are tethered, they will crack the fruit after being watered on sunny days. Low-temperature, low-light, high-temperature and high-light periods coincide with fruit enlargement, and the absorption of nitrogen, potassium, and boron increases, and the relative demand for phosphorus is relatively small. If the input amount of phosphorus is too large, it will affect the absorption of potassium and boron, which will make the fruit seeds less meat and more rigid. Phosphate fertilizer is mainly applied under the seedling roots during planting, and 2-3 kilograms of pure phosphorus is applied per acre at a later stage, and potassium fertilizer is mainly applied during the result period.
Four, fallen fruit disease
In the low-temperature period, the lower leaves yellowed off and the young fruit in the high-humidity period softened and fell. When the temperature is too low, nitrogen and phosphorus fertilizers are applied excessively to make the soil concentration large, and the plants will be aged due to long-term nutrient imbalance, which is the sequelae of the reduction of gibberellin production caused by zinc deficiency. The petiole and culm, stalk, and fruit junctions were separated and fell off due to lack of auxin. Aged eucalyptus leaf surface sprayed with zinc sulfate 700 times, or 1 kg per gram of zinc sulfate applied, can also be sprayed on the surface of the green waves and other zinc-containing nutrients to prevent long-term growth.
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