1. Requirements of Fertilizer: Autumn sowing celery nutrition nutrient growth period high absorption, this period of nitrogen, phosphorus, potassium, magnesium, calcium absorption of the five elements of the total absorption of more than 84%. The highest amount of nitrogen was required for celery, followed by calcium and potassium, and phosphorus and magnesium were the least. The celery's requirement for boron is also very large. In the absence of boron or due to drought-induced low temperature absorption, the petiole is prone to transverse cracking, ie, stem cutting disease, which seriously affects the yield and quality.
2. Fertilization technology: The fertilization amount per acre for the whole growth period of celery at medium fertility level is 2500-3000 kg of farmyard fertilizer (or 350-400 kg of commodity organic fertilizer), 13-16 kg of nitrogen fertilizer, 5-6 kg of phosphate fertilizer, and 6 kg of potassium fertilizer. 9 kg, nitrogen and potassium fertilizer sub-basal fertilizers and three top-dressing fertilizers, fertilizer ratio 2:3:3:2, all phosphate fertilizers as base fertilizer, fertilizer and farmyard fertilizer (or commercial organic fertilizer) mixed application.
Basal fertilizer: Apply 2500-3000 kg of farmyard fertilizer 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: After easing the seedlings, Mushi urea 6-8 kg, potassium sulphate 3-4 kilograms; mushy urea 8-11 kg, potassium sulphate 3-5 kilograms in the early growth stage; vigorous growth Mushi urea 6 -8 kg, potassium sulfate 3-4 kg.
Root dressing: If you find heart rot, use 0.3% to 0.5% calcium nitrate or calcium chloride for foliar spray. Foliar application of boron fertilizer can avoid the occurrence of stem cracking to a certain extent, spray 0.2% borax or 40-75 kg boric acid solution per acre. Facilities can be grown with carbon dioxide gas fertilizer.
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