How to fertilize greenhouse celery

The celery produced in the greenhouse is a shallow rooted vegetable with weak water absorption capacity and strict requirements on soil moisture. Therefore, it is suitable for the clay soil or sandy loam soil with rich organic matter and strong water retention and fertility conservation. In the absence of organic matter, cultivation of celery in sandy and sandy loam soils that are prone to leakage of water and fertilizers tends to produce hollow phenomena. In addition, celery's demand for nitrogen, phosphorus, and potassium is relatively large, and the requirement for nitrogen is large at the early and late stages of fertility. Phosphorus is required at the initial stage and more potassium is required at the later stage. Nitrogen deficiency during the growth period tends to cause the cells to age, eventually resulting in hollow stems. In the absence of phosphorus, the celery seedlings were thin, the petioles were old, and the leaves were dull.

It was determined that 20 grams of nitrogen, 7 grams of phosphorus, and 30 grams of potassium were required for every 50 kilograms of celery produced. In addition, celery's need for boron is strong, and when it is deficient in boron, the plant is susceptible to heart rot. According to the celery's reproductive characteristics and fertilizer requirements, the fertilization techniques are:

Basal fertilizer: On the basis of applying organic fertilizer, Mushi phosphorus potassium fertilizer 15-20 kg.

Topdressing: After the seedlings are chased once, the Nitric Acid Phosphate Fertilizer is applied at 20 kg per mu. After 20 days, 20 kg of Nitrophosphate is chased with the flushing method and the top dressing is stopped 20 days before harvest.

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