The first is to deepen the ditch. A lot of vegetable farmers have the habit of flushing with water when they are chasing chemical fertilizers. In fact, under the hot summer weather conditions, this method of fertilization is unscientific. Because, under high temperature conditions, nitrogen-based fertilizers (urea, ammonium nitrate, ammonium bicarbonate) are easily decomposed, especially ammonium bicarbonate is highly volatile. The ammonia produced by the decomposition not only reduces the fertilizer efficiency, but also easily causes eggplant ammonia poisoning. . Therefore, according to the characteristics of nitrogen fertilizer, deep ditching method should be adopted. The ditch depth should be 5-8 cm. After the application, the soil should be buried in time and the water should be poured to fully dissolve the fertilizer.
The second is scientific use. The demand of nitrogen fertilizer in eggplant is very large during the full fruit period, but in high temperature weather conditions, fertilization methods of “eat less and eat more†should be adopted. Under high temperature conditions, the conversion rate of urea after applying to the soil is relatively fast. After the plants meet their needs, the excess will be lost. Especially in sandy soils, the fertilizer loss rate will be higher. The amount of ammonium bicarbonate per acre does not exceed 20 kg. It is usually 4-6 days and it is fertilized once with water.
The third is formula fertilization. Although eggplant absorbs nitrogen, phosphate fertilizer and potash fertilizer are also essential. When topdressing, not only topdressing nitrogen fertilizer is applied every time. In the full fruit period, it is necessary to use phosphate fertilizer and potash fertilizer 2-3 times, which can increase eggplant yield, improve quality, and extend the effect of picking period. Generally, 20 kg of phosphate fertilizer is added every time, and 10 kg of potassium fertilizer (potassium sulfate) is appropriate.
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