High-yield cultivation technology of celery
Celery is a shallow-rooted vegetable with weak root absorption capacity. Its root mass is mainly distributed in the soil layer 10-20 cm below the surface, and is distributed horizontally about 30 cm. For this reason, in the peak season of celery growth, the timely supply of sufficient water will directly affect the production and quality of celery. The growth of celery requires cool, moist environmental conditions. The suitable temperature for growth is 15°C-20°C. The temperature above 30°C can still grow, but the growth above 26°C is not good and the quality is poor, but the seedling stage is resistant to high temperature; 4-5 Leafy young plants 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 to 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 suppresses longitudinal 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 stage is longer, and the root absorption capacity is relatively weak, so the water requirement 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 demand of celery for boron and calcium is very large. In the absence of boron, the petiole is easily cracked; in the absence of calcium, black heart disease is prone to occur. Celery can be cultivated all year round. However, it is generally necessary to cultivate strong seedlings before planting, generally 30-50 grams per acre. 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. It can be harvested after 50-60 days.
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