Celery soil testing and formula fertilization technology


1. Characteristics of fertilizer requirement: The nutrient absorption of celery in autumn is high. In this period, the absorption of nitrogen, phosphorus, potassium, magnesium and calcium accounts for more than 84% of the total absorption. Celery requires the highest amount of nitrogen, followed by calcium and potassium, and phosphorus and magnesium. The celery needs a large amount of boron. When the boron-deficient soil or the low temperature inhibits absorption due to drought, the petiole is easy to rupture, that is, the "stem disease", which seriously affects the yield and quality.
2. Fertilization technology: Under the medium fertility level, the fertilization amount per mu of celery in the whole growth period 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 carried out with 0.3%-0.5% calcium nitrate or calcium chloride. Foliar application of boron fertilizer can avoid the occurrence of stem cracks to some extent, spraying 0.2-75 kg of borax or boric acid solution per acre. Facility cultivation can increase carbon dioxide gas fertilizer.

Huaxian County Agricultural Products Inspection and Testing Center Chang Bili
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