In addition to NPK, celery has a large demand for boron. Adding zinc fertilizer can reduce the content of nitrate and nitrite in fresh vegetables. The production of 1000 kg of celery requires 2.0 kg of pure nitrogen, 0.93 kg of phosphorus pentoxide, and 3.9 kg of potassium oxide. Before planting, apply 4000~5000 kg of organic fertilizer per acre, 150 kg of bio-organic compound fertilizer, 40 kg of urea, 25-35 kg of superphosphate, 40 kg of potassium sulfate and 1~1.5 kg of zinc sulfate. The plant enters the vigorous growth period and carries out the first top dressing. The application of pure nitrogen is 3 kg per mu and the potassium oxide is 5-6 kg. After half a month into the second top dressing, apply 2 to 2.5 kg of pure nitrogen per mu and 4 to 5 kg of potassium oxide. In the vigorous growth period, 0.2 to 0.5% borax can be sprayed outside.
Article source: Agricultural Network
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