Winter cultivation techniques of celery

I. Seeding and seedling raising: Coastal areas of Fujian Province are generally seeded and seedling raised in mid-to-late July to mid-August. Prepare seedbeds first, keep the soil loose, and then apply 100 kg of manure and plant ash per acre, and turn the rake evenly. The seeding amount per square meter of seedbed is 2-2.5 grams, and the planting field per acre requires 13-15 grams. After covering, Thin soil. At 5-6 leaves, it can be planted in the field.

Colonization

1. Time: Planting from late August to late September.

2. Planting and Cultivation: The planted field should ensure that the soil is fertile and loose to avoid heavy cropping. Before planting, be sure to apply enough manure. Apply 3000-4000 kg of organic fertilizer, 30-35 kg of superphosphate, and 20-25 kg of potassium sulfate per acre. For boron-deficient soil, 1-2 kg of borax can be applied per acre. After turning the rakes evenly, the ridges are 1.2 meters wide and the row spacing is 15 cm × 20 cm. When planting, cut off part of the main root and leave it at 2 cm to promote the growth of fibrous roots and strengthen the root system.

Third, fertilizer and water management

1. After the planting, the planting water should be poured, and it will survive for about 3 days. After 7 days, new leaves will germinate, and the soil should be kept moist to avoid drought.

2. After 15 days of planting, the seedlings should be squatted for 5-7 days to promote root infiltration and new leaf differentiation. When the plant is thick and the leaf color is thick and green, stop squatting, and water it once every 5-7 days to keep the surface dry and wet.

3. After about 30 days of planting, the plant grows to 30 cm and enters the vigorous growth period. Water is poured once every 3-4 days. After the squatting is finished, 500 kg of human urine or 15 kg of compound fertilizer are flushed with water per mu. After that, 15 kg of compound fertilizer was flushed with water every 15 days, and topdressing was stopped 20 days before harvest.

4. If there is a lack of fertilizer in the later period, when the leaves are yellow, spray 0.3% urea or foliar spray 0.3% potassium dihydrogen phosphate to promote growth.

5. When applying chemical fertilizer, spread it at noon after dew has dissipated. Nitrogen fertilizer should be used for topdressing in hot and rainy seasons, and no manure should be used to avoid rotten roots.

4. Weeding and weeding: The suitable growth temperature is 15-20 ℃, and the temperature at noon * cannot exceed 25 ℃. When the soil is compacted, weeding and weeding as early as possible should be shallow, but not deep, so as not to hurt the roots. When the celery plant is about 50 cm high, soil softening can be carried out, which can increase yield.

V. Pest Control

1. The disease has spot disease, which can be prevented and treated with 400 times of liquid zinc. Prone to physiological diseases under high temperature and deficient conditions. For potassium deficiency and boron deficiency, spraying 0.2% potassium dihydrogen phosphate and 0.1% borax can relieve the development of symptoms.

2. Insect pests include aphids and carrot flies. Aphids can be controlled with 600 times liquid or 2.5% kung fu EC 4000 times. Carrot flies can be treated with 20% Juma EC 3000 times, 80% trichlorfon soluble powder 1000 times 1000% of 50% Dimethoate EC.

6. Harvest: Celery can be harvested 50-60 days after planting and the petiole length reaches 40 cm. Harvesting generally takes place during the boom season. The method is to cut out the growing leaves, leaving a petiole about 1 cm long at the base. The harvesting standard is that when the plant has more than 14 green leaves, picking leaves with moderate growth and good commerciality in the middle, generally 3-4 leaves in the middle are appropriate. Generally, 2-3 leaves are taken before New Year's Day, and can be harvested for the second time before and after the Spring Festival. After the Spring Festival, it is harvested until the whole plant is pulled up.

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