Celery soil testing and formula fertilization technology
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2. Fertilization technology: Under the medium fertility level, the fertilization amount per mu of celery is 2500-3000 kg (or commercial organic fertilizer 350-400 kg), nitrogen fertilizer 13-16 kg, phosphate fertilizer 5-6 kg, potassium fertilizer 6- 9 kg, nitrogen and potassium fertilizer base fertilizer and three top dressing, fertilization ratio 2:3:3:2, phosphate fertilizer all used as base fertilizer, fertilizer and farmyard manure (or commercial organic fertilizer) mixed application. Base fertilizer: 2500-3000 kg of farmyard manure or 350-400 kg of commercial organic fertilizer per mu, 4-5 kg ​​of urea, 11-13 kg of diammonium phosphate and 4-5 kg ​​of potassium sulfate.
Top dressing: 6-8 kg of urea and 3-4 kg of potassium sulfate in the growth period of the heart-leaf growth period after slow seedling growth; 8-11 kg of urea and 3-5 kg ​​of potassium sulfate in the early stage of vigorous growth; -8 kg, potassium sulfate 3-4 kg.
Top dressing: If heart rot is found, foliar spray can be applied with 0.3%~0.5% calcium nitrate or calcium chloride. Foliar application of boron fertilizer can avoid the occurrence of stem cracks to a certain extent, spraying 0.2% borax or boric acid solution 40~75 kg per acre. Facility cultivation can increase carbon dioxide gas fertilizer.