First, the spring carrot combination 1. Red core 4 is a hybrid combination developed using the male sterile line. The leaves on the ground have dark green color and strong growth; the growth period is 100-105 days, and it is medium and early maturity; it has strong anti-convulsions, neat roots, smooth appearance, and round tails; the skin, meat, and heart are bright red, and the stems are thin. Good taste; fleshy root length 19-20 cm, diameter 5 cm, single root weight 200-220 g; suitable for fresh food and processing; strong resistance to diseases and insect pests, low deformity root rate, mu yield about 4000 kg . 2. The upper part of the hybrid combination of Hongxin No.5 has a prosperous growing condition with strong green leaves; strong twitch resistance; suitable for spring sowing; 100-150 days of growing period, medium-early maturity, neat appearance of fleshy root, good taste; meaty root length 18-20 Centimeter, diameter 5 centimeters thick, single root weight 220 grams, good quality, suitable for fresh food and processing; strong resistance, low deformity root rate, mu yield 3500-4000 kg. 3. The core part of the red core 6 cross hybrid is dark green, strong in growth but not prosperous; it has strong anti-convulsions and is suitable for early spring planting; the fertility period is 105-110 days, and it is a mid-maturing variety; it is an ideal variety suitable for fresh food and processing; The fleshy root is 22 centimeters in length and about 4 centimeters in diameter. The single root weighs 200 grams and the mu yield is about 4,000 kilograms. Its ability to resist diseases and pests is strong. Second, cultivation points 1. Appropriate sowing: spring sowing carrots in the selection of anti-convulsion varieties of the premise, as far as possible sowing, too late sowing causes root swelling of the meat in the summer high temperature period, easy to produce a large number of deformed roots, usually in the daily average temperature above 7 degrees Celsius to sow. Normally in North China, it is sown in late March and early April. 2. Soil preparation and fertilization: Carrot is a root crop, and sowing should be done in a sandy loam with deep soil and good water permeability. Apply 3,000 kg of high-quality organic fertilizer per acre, 30 kg of phosphorus-potassium compound fertilizer, 10 kg of available nitrogen fertilizer, 25-30 cm of tillage depth, 1/2 inch after finishing, and 1.5 to 1.7 meters wide and 10 to 20 meters long. It is 30 centimeters wide. 3. Soak germination and sowing: soak the seed in warm water of 30-40 degrees Celsius for 3-4 hours, remove it and place it in a wet cloth bag, put it under 20-25 degrees Celsius, germinate the seeds, keep the seeds moist, and rinse and stir regularly, make The temperature and humidity are uniform, and most seeds can be sown when exposed. Carrot seeds can be sown or drilled, and the net seed removal rate per acre for hair removal is 0.3-0.5 kg. In order to ensure uniform sowing, seeds soaked and germinated can be mixed with fine wet sand to sow at a ratio of 1 part of 3 wet seeds. Drilling depth of about 1 cm drill, cover about 1 cm, should not cover the soil too deep, and then pragmatic watering, stamping the film or cover instead of straw, to promote early emergence. 4. Field management: (1) Seedlings, Dinglings: After the seedlings are released, the cover is removed in the morning without wind. Seedlings 2 times during seedlings, the first time in 1-2 true leaves, between the bad seedlings, weak seedlings and too dense seedlings; the second time in the 4-5 true leaves, after the seedlings will be fixed seedlings, Dingmiao After the seedlings were planted at a distance of 10-12 centimeters, the spacing was 16-20 centimeters, and 3.5-4 million seedlings were maintained per acre. (2) Cultivating soil and weeding: The carrots need to be protected by cultivators before mulching, which can be carried out timely after fertilization, seedlings, and watering. The cultivator should not be too deep. After the cultivator, the soil should be properly cultivated. The last cultivator before mulching will be finely soil-plotted to the roots to prevent the roots from expanding and then expose the ground to form green shoulders and reduce the quality of the fleshy roots. Weeding is the key to the high yield of carrots. Herbicides can be used instead of artificial ones. Each mu uses 50% of Praxanthine WP and 100 g of water, 25 kg of water, and the surface soil is sprayed before seeding. (3) watering, top dressing: spring sowing carrot seedlings are more arid, usually 7-10 days watering once; enter the period of vigorous growth of leaves, appropriate control of water, cultivator seedlings, prevent leaf ministry, 12-15 days watering 1 Times; meat roots need to adequately and timely watering roots, usually 10-15 days watered once. Carrot dressing is generally 2 times, the first time in the 5-7 days after the start of seedlings, with water per acre of ammonium sulfate 3 kg, 3 kg of superphosphate, 3 kg of potassium; the second in the 8-9 true leaves that The period of swelling of fleshy roots is 7.5 kg of ammonium sulfate per acre, 3 kg of superphosphate, and 3 kg of potash. 5. Timely Harvest: Generally harvested from late June to early July. Harvesting too early or late will affect the properties of carrots. If there is 0-3 degrees Celsius cold storage after storage, it can be supplied throughout the summer.