In recent years, with the continuous improvement of people's living standards, the area of ​​carrots in the off-season Spring sowing cultivation has been increasing. The cultivation techniques of spring sowing carrots are introduced as follows.
First, the variety selection and sowing amount of spring sowing varieties should be selected to resist convulsions, good quality, high yield, medium and early maturing varieties. Such as the new black field 5 inch, red core 4, and Chunhong No. 1 variety belong to this type. Seeding rate: 0.75kg for sowing, 1-1.5kg/mu for sowing.
Second, cultivation techniques
1. It is determined that the suitable sowing date is easy to twitch early in spring sowing; the late sowing causes the meat root to expand at a high temperature of 25 ° C or higher, producing a large number of deformed roots, and the suitable temperature for cartilage root enlargement is 18-25 ° C. According to the experience of production, under the premise of selecting the varieties resistant to twitching spring sowing, it can be sown at a daily average temperature of 10 ° C and a night average temperature of 7 ° C. Generally, the northern part of North China is planted in early April, and the southern part of North China is planted in late March. Central and southern China can be planted in early March; alpine areas such as northwest and northeast can be planted from late April to early May.
2, soil preparation and soaking seeds and germination carrots are root vegetables crops, should choose deep sandy soil, fertile soil, well-drained sandy loam or loam. Deeply cultivated before sowing, the depth of cultivation is not less than 25cm. Combined with ploughing, 5000kg of farmyard manure per 667m2, 15kg of phosphorus and potassium fertilizer and quick-acting nitrogen fertilizer. Carrot seeds are not easy to absorb water and ventilate, and the temperature of spring sowing is low, resulting in slow seed germination and emergence. In order to promote early germination and emergence, soaking and germination should be carried out before sowing. The method is to soak seeds in warm water of 30-35 ° C for 3 to 4 hours. After the fish is removed, moisten it with a wet towel or bag, and germination is carried out at a temperature of 25 to 30 ° C. 4 days, stir and rinse regularly. After 80%~90% of the seeds are white, they can be mixed with wet sand for sowing. After sowing, cover a layer of thin soil and cover the mulch. It can also be replaced by grass or straw.
3, field management to keep the soil moist after sowing, should be immediately watered or repressed and watered, create conditions conducive to seed germination and emergence, after the seedlings are out, the cover is removed in the windless morning. Seedlings were planted twice during the seedlings, and the first time was carried out in 1 to 2 true leaves, and the inferior seedlings, weak seedlings and over-milk seedlings were removed; the second time was carried out in the true leaves of 3 to 4 leaves, and the seedlings were fixed after the seedlings. 9cm, line spacing 15 ~ 18cm. Interplanting and weeding is the key to high-yield carrots. It can also be weeded with herbicides. It is usually used in 50% of grass and 450kg, and weeding 75kg of water. In addition, pay attention to the soil during the cultivating, and prevent the top of the fleshy root from protruding to the ground to form a green shoulder. In order to make carrots high-yield, the whole growth period should be watered and topdressed 1 or 2 times. The first time is carried out 5 to 7 days after the seedling is fixed, combined with watering, 3 kg of ammonium sulfate per 667 m2, phosphorus and potassium fertilizer and 3 kg. The second time in the 8 to 9 true leaves, that is, the initial stage of the succulent root expansion, is also the most water demand period, combined with watering per 667 m2 of 7.5 kg of ammonium sulfate, 3.5 kg of phosphorus and potassium fertilizer.
4, timely harvesting spring sowing carrots in the late March, usually harvested in late June to early July, can also be harvested according to market demand. At maturity, the leaves no longer grow, no new leaves are seen, and the lower leaves turn yellow. If there is a cold storage of 0~3 °C, it can be stored after harvesting and can be supplied throughout the summer.
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