Celery produced in the shed is a shallow-rooted vegetable with weak water absorption capacity and strict requirements on soil moisture. Therefore, it is suitable for clay soil or sandy loam with rich organic matter and strong water and fertilizer retention capabilities. Lack of organic matter, celery cultivation in sandy soil or sandy loam soil that is prone to leaking water and fertilizer is prone to hollowing out. In addition, celery has a large demand for nitrogen, phosphorus, and potassium, and requires a large amount of nitrogen in the early and late stages of growth. It needs more phosphorus in the early stage and more potassium in the later stage. Nitrogen deficiency during the growth period is easy to cause cell aging, and eventually lead to hollowing of the petiole. When phosphorus is deficient, celery seedlings are thin and weak, petioles are dry and old, and leaves are dull.
According to measurements, every 50 kg of celery requires 20 grams of nitrogen, 7 grams of phosphorus, and 30 grams of potassium. In addition, celery has a strong demand for boron, and plants are prone to heart rot when they are lacking in boron. According to the growth characteristics and fertilizer requirements of celery, the fertilization techniques are:
Base fertilizer: On the basis of applying sufficient organic fertilizer, 15-20 kg of phosphate potassium nitrate fertilizer is applied per mu.
Topdressing: Topdressing once after squatting the seedlings, topdressing 20 kg of nitrophosphate fertilizer per mu, and then topdressing 20 kg of nitrophosphate fertilizer every 20 days, and stop topdressing 20 days before harvest.
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