Fertilizer Absorption and Fertility Dynamics of Celery

(1) Root Absorption Characteristics: The main root of celery is well developed. When the main root is damaged, lateral roots grow rapidly in response. Therefore, transplanting seedlings is recommended to promote healthy root development. Most of the root system is concentrated in the top 20 cm of soil, classifying celery as 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 fertility, with a suitable pH range of 6 to 7.5 and a salt content below 0.3%. These conditions help ensure optimal nutrient uptake and overall plant health. (2) Nutrient Requirements: Throughout its growth cycle, celery absorbs nutrients in proportion to its biomass increase. The absorption pattern of all nutrients follows an "S" curve, indicating a gradual rise followed by a peak. Autumn celery, in particular, experiences a period of high nutrient demand. The peak absorption phase occurs between 68 to 100 days after sowing, during which more than 84% of total nutrient uptake takes place. Notably, calcium and potassium make up the largest share, at 98.1% and 90.7%, respectively. Among the essential nutrients, nitrogen is required in the highest amount, followed by calcium and potassium, while phosphorus and magnesium are needed in smaller quantities. The typical ratio of 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. Understanding these nutrient dynamics helps farmers optimize fertilization strategies for better yield and quality.

Disposable Piercing Guide - WPTC5

A Disposable Laparoscopic Trocar is a medical device used in minimally invasive surgery to create a small incision in the abdominal wall for the insertion of surgical instruments and a camera. It consists of a sharp, pointed tip that is inserted through the skin and into the abdominal cavity, and a sleeve that provides a pathway for the surgical instruments. Once the trocar is inserted, the sleeve is locked in place and the instruments can be inserted and removed through it. Disposable laparoscopic trocars are designed for single-use only to prevent the risk of infection and cross-contamination. They are available in different sizes and shapes to accommodate various surgical procedures.

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Changzhou Weipu Medical Devices Co., Ltd. , https://www.cnweipumedical.com