How to fertilize shed celery

The celery produced in the greenhouse 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 soil with rich organic matter and strong water and fertilizer retention capacity. Lack of organic matter, cultivation of celery in sand and sandy loam soil that is easy to leak water is easy to produce hollow phenomenon. In addition, the demand for nitrogen, phosphorus and potassium in celery is large, and the demand for nitrogen in the early and late stages of growth is very large. In the initial stage, there is more phosphorus, and more potassium is needed in the later stage. Nitrogen deficiency during the growth period tends to age the cells, eventually leading 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.

According to the measurement, each production of 50 kg of celery requires 20 g of nitrogen, 7 g of phosphorus and 30 g of potassium. 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 technique is:

Base fertilizer: On the basis of applying organic fertilizer, 15-20 kg of NPK fertilizer is applied per mu.

Top dressing: After the seedlings are chased once, the fertilizer is 20 kg of nitrophosphate fertilizer. After 20 days, 20 kg of nitrophosphate fertilizer is applied by means of flushing, and the topdressing is stopped 20 days before harvest.

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