Celery is a shallow root vegetable with weak root absorption. Its root mass is mainly distributed in the soil layer 10-20 cm below the surface and is distributed horizontally about 30 centimeters. In view of this, whether it can be supplied in time for the growth of celery Sufficient water will directly affect the yield and quality of celery. The celery's petiole is wide, thick and flat, with less fiber and more solid. If the cultivation density of celery is large, the petiole is long and narrow, whereas the petiole is wide and short. Under normal circumstances, there are 8-13 leaves that make up the product.
The celery requires cool and moist environmental conditions. The suitable temperature for growth is 15°C-20°C. The temperature above 30°C can still grow, but the growth is not good at over 26°C, the quality is poor, but the seedling temperature is high; 4-5 tablets. The young plants of the leaves can tolerate temperatures below -10°C and below 12°C; adult plants can tolerate low temperatures of -8°C to +10°C for short-term zero-zero temperatures. Celery is a greenish vernalized plant with 3-4 leaves of seedlings. It can pass through the vernalization stage in 15-20 days at a low temperature of 2°C-5°C. After passing through the vernalization stage, the plants were able to draw stems, flower and firm under long days and high temperatures. Celery requires medium intensity light, strong light inhibits vertical growth, and promotes lateral growth. Under strong light, the petiole has a high degree of fiber and its quality is reduced.
The growth of celery seedlings is slow, the seedling period is longer, and the root absorption capacity is relatively weak, so the requirement for water is very strict. After the plants entered the slow growth period, the water requirement was less than the seedling period. After the plants enter the vigorous growth period, the surface is covered with white fibrous roots, which requires the most water.
The requirements for minerals of celery are mainly nitrogen and phosphorus in the early stage of growth, and nitrogen and potassium are the main factors in the later stage of growth. The celery has a great demand for boron and calcium. When the boron is deficient, the petiole is easily cracked; in the absence of calcium, black heart disease occurs.
Celery can be cultivated all year round. However, it is generally necessary to cultivate strong seedlings before planting, generally 30-50 grams per acre. In the past, people generally advocated 50-60 days of seedling age, and now generally promote 90-100 days of seedlings.
Nursery. Such as in the cold season seedlings, generally need to soak germination, soaking in fresh water for 12-24 hours, germination temperature 15-20 °C after sowing on the fine sand 1 cm or fine wet soil 0.5 cm, the rear cover membrane moisturizing insulation, the required soil temperature 15 °C -20°C. If sowing in the hot season, dry seeds are generally seeded directly. After sowing, shading is covered with thin straw curtains, and shading is gradually reduced after emergence. After the emergence of the seedlings of poor water absorption, to be hard water pouring, up to 2-3 leaves for thinning, then see the surface see dry see wet, up to 3 leaves 1 heart or 4 leaves 1 heart can be colonized.
Colonization. The density of colonization depends on the size of the species itself and the demand for the size of the commodity. Generally, the individual plant weight is 700-1000 grams, the plant spacing should be 25-35 centimeters; the individual plant weight is 300-600 grams, and the row spacing should be It is 17-25 centimeters; the individual plant weight is 250-300 grams, and the row spacing should be 13-17 centimeters.
Planting management. The daytime temperature is generally kept at 15°C-20°C and nighttime at 5°C-10°C. Try to get the night temperature not lower than 5°C. The seedling height is about 15 centimeters. When it starts to close to the ridge, it starts to top-dressing and watering. Each time, it uses ammonium nitrate 15-20 kg or ammonium sulfate 25-30 kg. After 3-5 days, it is poured 1 water, 15-20. A day or so after a fat recovery. Fruit can be harvested after 50-60 days.
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