Celery needs fertilizer:

For every 1000 kg of celery produced, 1.6 to 3.6 kg of pure nitrogen, 0.68 to 1.5 kg of phosphorus, 4 to 6 kg of potassium, 1.5 kg of calcium and 0.8 kg of magnesium are required. Celery is mainly dominated by nitrogen and phosphorus nutrients in the early stage to promote the development of root system and leaf growth. In the middle stage (4-5 to 8-9 leaf stage), the absorption of nutrients changes from nitrogen and phosphorus to nitrogen and potassium. main body. The balance of nitrogen and potassium is beneficial to promote the development of heart leaves.

As the number of birth days increases, the absorption of nitrogen, phosphorus, and potassium increases rapidly. The highest growth period of celery (8-9 leaf to 11-12 leaf) is also the period of the most nutrient absorption.

Base fertilizer:

1. Purpose of fertilization:

Provide basic nutrients for the growth of celery throughout the growth period.

2. Fertilization ratio, dosage and method:

Commercial organic fertilizer 200kg-300kg/mu + balanced sulfur-based compound fertilizer (proportion of 15-15-15, 17-17-17, etc.) 40-60kg/mu, organic fertilizer and chemical fertilizer are mixed and applied during land preparation.

Lifting fertilizer:

1. Purpose of fertilization: After slowing seedlings, promote seedlings to grow early and grow quickly.

2. Fertilization ratio, dosage and method:

After planting slow seedlings, high nitrogen sulfur-based or high nitrogen nitrosulfur compound fertilizers (26-6-6, 24-6-10, etc. ratio) of 8-15 kg/mu can be applied in combination with slow seedling water.

Fertile topdressing during the growing season:

1. Purpose of fertilization:

When celery enters the peak growth period of leaf clumps, the leaf area expands rapidly and the petiole elongates rapidly. At this time, top dressing can meet the needs of celery for the rapid increase of nutrients.

2. Fertilization ratio, dosage and method:

In the early period of vigorous growth, high-nitrogen and high-potassium type sulfur-based or nitrosulfur-based compound fertilizers (15-5-25, 20-6-20 and other proportions) 15-20 kg/mu, combined with watering topdressing; mid-vigorous growth, High nitrogen and high potassium type sulfur-based or nitrosulfur-based compound fertilizer (15-5-25, 20-6-20 and other ratios) 20-25 kg/mu, combined with watering topdressing.

Top dressing outside roots:

30-60 days after celery planting is the period of product organ formation, foliar spraying Shengda Fertilizer Liquid Fertilizer (30-30-140) 2-3 times, the recommended dilution concentration is 400-500 times.

Remarks:

1. Celery is more sensitive to boron deficiency. If celery is grown on boron-deficient soil, it is recommended to add 1-2 kg of borax per mu when using base fertilizer.