The summer celery has a short growth period, so it is mainly applied nitrogen fertilizer to promote the growth of stems and leaves. In the fertilization technology, we should master the principle of “applying sufficient base fertilizer and diligently applying thin fertilizerâ€.
On the basis of the application of the base fertilizer, diligent application of topdressing. The first top dressing should be applied for 10 kg of urea 5 to 7 days after emergence. After every 8 to 10 days, the fertilizer should be followed up. It is generally necessary to apply fertilizer for 4 times, and 10 to 12 kg of urea per mu.
As the celery plant increases, the amount of fertilizer applied should also increase. In the early stage of growth of summer celery, spraying 2~3 times of instant boron fertilizer or superphosphate leaching solution can prevent cracking and rotten heart of petiole and yellowing of petioles at the later stage. In the middle and late growth of celery, spraying 500 times of potassium dihydrogen phosphate and 1000 times of "nine two" mixture on the leaf surface can significantly enhance the disease resistance of celery plants, effectively increase yield and improve quality.
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