Wintering eggplant results four notes
The results of greenhouse eggplant overwintering at the beginning of the greenhouse are in the period of low temperature and low light. During this period, the roots are weak in absorbing water and fertilizer, and are vulnerable to the abnormal symptoms caused by the lack of nutrient elements.
First, yellow leaves
1. Symptoms. The young leaves are bright yellowish white with green leaves on the tips of the leaves and rust-colored streak spots appear on the lower middle leaves.
2. The cause of the disease. Fertilizer, high humidity, soil acidity; excessive manganese, inhibit ferritin absorption, resulting in new leaf yellowing.
3. Control measures. After onset, the leaves were sprayed with 500 times ferrous sulfate; field application of magnesium hydroxide and lime, adjust the pH of the soil; potassium supplement to Balance the nutrition, can meet or promote the supply of ferritin.
Second, buds are not open
1. Symptoms. The ovary does not inflate and the buds do not open tightly, affecting pollination and fertilization.
2. The cause of the disease. In the cold season, the field lacks water, the air is humid, the soil pH value is more than 7.5, and the soil's self-produced boron is less effective; there is excessive lime and calcium in the field, and boron is absorbed to induce plant lack of boron, which can cause buds to remain open for a long period of time.
3. Control measures. Spray borax 700 times.
Third, cracking fruit
1. Symptoms. The fruit is stiff but not inflated, the skin is dull, and there are white stripes. After watering, it becomes cracked. It is not long and has poor quality. After the eggplants are tethered, they will crack the fruit after being watered on sunny days.
2. The cause of the disease. The low temperature and low light period coincide with fruit enlargement, and the demand for nitrogen, potassium, and boron is relatively high, and the relative demand for phosphorus is small. If the input amount of phosphorus is too large, it will inevitably affect the absorption of potassium and boron, making the fruit more fleshy and less rigid.
3. Control measures. Phosphate fertilizer is mainly applied in the planting ditch, and the pure phosphorus is applied at 2 to 3 kilograms per mu in the later stage. The result is mainly applied to potash fertilizer.
Fourth, prevent falling fruit
1. Symptoms. During the low-temperature period, the lower leaves yellowed off and the young fruit softened and fell.
2. The cause of the disease. Zinc deficiency caused a decrease in gibberellin synthesis, and the junction between petiole and stem, stalk, and fruit was detached due to lack of auxin.
3. Control measures. Aged eucalyptus leaf sprayed with zinc sulfate 700 times anti-drop promote long.
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