In winter, celery is a shallow root vegetable with weak water absorption capacity and strict requirements on soil moisture. Therefore, it is suitable for alkaline or sandy loam with rich organic matter and strong water and fertilizer retention capacity. Lack of organic matter, cultivation of celery in sand and sandy loam that is easy to leak water is easy to produce hollow phenomenon. The demand for nitrogen, phosphorus and potassium in celery is large. The demand for nitrogen in the early and late growth stages is very large. The initial phosphorus needs more, and the potassium needs more in the later stage. Nitrogen deficiency during the growth period tends to cause aging of the cells, which eventually leads to a hollow phenomenon in the petiole. When the phosphorus is deficient, the celery seedlings are thin, the petioles are dry and the leaves are dull.
For each 50 kg of celery, 20 g of nitrogen, 7 g of phosphorus, and 30 g of potassium are required. In addition, celery has a strong need for boron, and plants are prone to heart rot when boron is deficient. According to the fertility characteristics and fertilizer characteristics of celery, the fertilization techniques are as follows: 1. Base fertilizer: On the basis of applying organic fertilizer, 15-20 kg of NPK fertilizer is applied per mu. 2. Topdressing: After the seedlings are chased once, the fertilizer is 20 kg of nitrophosphate fertilizer. After 20 days, 20 kg of nitrophosphate is chased by the method of rushing, and the topdressing is stopped 20 days before harvest.
For each 50 kg of celery, 20 g of nitrogen, 7 g of phosphorus, and 30 g of potassium are required. In addition, celery has a strong need for boron, and plants are prone to heart rot when boron is deficient. According to the fertility characteristics and fertilizer characteristics of celery, the fertilization techniques are as follows: 1. Base fertilizer: On the basis of applying organic fertilizer, 15-20 kg of NPK fertilizer is applied per mu. 2. Topdressing: After the seedlings are chased once, the fertilizer is 20 kg of nitrophosphate fertilizer. After 20 days, 20 kg of nitrophosphate is chased by the method of rushing, and the topdressing is stopped 20 days before harvest.
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