Production of 50 kg of celery requires 20 grams of nitrogen, 7 grams of phosphorus, and 30 grams of potassium. In addition, celery has a strong need for boron, and plants are prone to heart rot in the absence of boron. According to the growth characteristics and fertilizer requirements of celery, its fertilization technology is:
1. Base fertilizer: On the basis of applying enough organic fertilizer, apply 15 to 20 kg of phosphorus nitrate and potassium fertilizer per mu.
2. Topdressing: topdress the fertilizer after squatting, topdressing 20 kg of nitrate phosphate fertilizer per mu, and topdressing 20 kg of nitrate phosphate fertilizer every 20 days thereafter, stop top dressing 20 days before harvest.
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