Summer topdressing methods and technical points for eggplant
Furrow application. Vegetable growers have become accustomed to applying chemical fertilizer by broadcasting it with irrigation water, but this method is not suitable during the hot summer season. Because the temperature is relatively high, when chemical fertilizer is applied with irrigation water, a large amount of ammonia volatilizes, which reduces the effect. This is especially true for ammonium bicarbonate, which is more likely to cause ammonia poisoning in eggplant. Applying it in furrows or burying it in holes gives the best results...
Furrow application. Vegetable growers have become accustomed to applying chemical fertilizer by broadcasting it with irrigation water, but this method is not suitable during the hot summer season. Because the temperature is relatively high, when chemical fertilizer is applied with irrigation water, a large amount of ammonia volatilizes, which reduces the effect. This is especially true for ammonium bicarbonate, which is more likely to cause ammonia poisoning in eggplant. Applying it in furrows or burying it in holes gives the best results. After topdressing, the soil covering thickness should be no less than 5 cm to reduce volatilization of the fertilizer's effective components.
Pay attention to the amount used. Eggplant has the greatest demand for nitrogen fertilizer, but during the hot season it must be given "small meals more often." Each application of urea per mu should generally be controlled within 30 kg. This is because during the hot season, urea transforms relatively quickly after being applied to the soil, and after the plants have met their needs, the excess portion will be lost. This is especially true for sandy soil, where the proportion lost will be even greater. For ammonium bicarbonate, each application per mu is more suitable at no more than 40 kg. If the application amount is too large, besides causing nutrient loss, it will also cause ammonia damage to eggplant leaves and fruit.
Reasonable combination. Although eggplant has the greatest demand for nitrogen fertilizer, phosphorus and potassium fertilizers are also indispensable, and nitrogen fertilizer alone cannot be applied at every topdressing. During the full fruit-bearing period, it is best to apply a three-element compound fertilizer twice, with no less than 40 kg per mu at each topdressing.