1. Ditch fertilization. The method of flushing with water should not be used in the high temperature season in summer, because the temperature is higher, and when the fertilizer is flushed, a large amount of ammonia gas will reduce the effect. Especially ammonium bicarbonate is more likely to cause eggplant ammonia poisoning. It is best to use trenching or burrowing. The thickness of the buried soil after top dressing should be no less than 5 cm to reduce the volatilization of the active ingredients of chemical fertilizers.
2. Pay attention to dosage. Eggplant needs the largest amount of nitrogen fertilizer, but in the hot season, it is necessary to "eat less and eat more meals." Each application of urea per acre should be controlled within 30 kg. Because of the high temperature season, the conversion rate of urea applied to the soil is relatively fast. After the plant meets the needs, the excess part will be lost. Especially for sandy soils, the loss rate will be greater. The application rate of ammonium bicarbonate per mu per mu is more than 40 kg. If the application amount is too large, in addition to nutrient loss, it will also cause ammonia damage to the leaves and fruits of eggplant.
3. Reasonable collocation. Although eggplant requires a large amount of nitrogen fertilizer, phosphorus and potassium fertilizers are also indispensable. When top dressing, it is not possible to apply nitrogen fertilizer only every time. It is best to apply ternary compound fertilizer twice during the fruit growing period, each time topdressing no less than 40 kg to meet the needs of eggplant growth and fruiting.
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