(1) Root absorption characteristics: The main root of celery is well-developed. When the main root is damaged, lateral roots grow rapidly to compensate. Therefore, transplanting seedlings is recommended to ensure healthy root development. Most of the root system is concentrated in the top 20 cm of soil, making celery a shallow-rooted vegetable. It thrives in loamy or clay-loam soils that are rich in organic matter (>1.5%), have good water retention, and high fertility. The ideal soil pH range is between 6 and 7.5, with a salt content below 0.3%. These conditions help support optimal growth and nutrient uptake.
(2) Nutrient requirements: Throughout its growth cycle, celery absorbs nutrients in proportion to its increasing biomass. The absorption pattern of all nutrients follows an "S" curve, indicating a gradual increase followed by a peak. Autumn celery experiences a period of intense nutrient demand, with the peak absorption occurring between 68 to 100 days after sowing. During this time, over 84% of the total nutrient uptake occurs, with calcium and potassium reaching as high as 98.1% and 90.7%, respectively. Among the essential elements, nitrogen is required in the largest quantity, followed by calcium and potassium, while phosphorus and magnesium are needed in smaller amounts. The typical nutrient ratio for nitrogen, phosphorus, potassium, calcium, and magnesium is approximately 9.1:1.3:5.0:7.0:1.0. For every 1,000 kg of celery produced, the plant absorbs about 2.0 kg of nitrogen, 0.93 kg of phosphorus, and 3.88 kg of potassium. Ensuring proper nutrient balance during this critical phase is essential for maximizing yield and quality.
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