2, the best fertilizer period of potato. Generally, top dressing is performed before the flowering period of the potato, while early-maturing varieties are suitable for top dressing at the seedling stage, middle and late-maturing varieties are preferably top-dressed before budding, and topdressing 10 kg of urea and 5-10 kg of potassium sulfate per mu can increase yield and improve quality.
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Top-dressing in the best period
1, corn the best fertilizer period. Under the principle of balanced fertilization, corn absorbs nutrients during the jointing period until the bell-mouth period. The first fertilizer can be applied before and after jointing, with 10 kg urea per mu. 7-10 days before tasselling, should apply the second fertilizer, 20 kg of urea per acre. If the base fertilizer and seed fertilizer are more abundant and the soil is very fertile, you can concentrate on topdressing once, and use the second spade for deep fertilization.