Variety selection and sowing volume: Spring sowing varieties should be selected with bolting resistance, better quality, higher yield, and middle-early maturity. Such as Xinheitian 5 inch, Hongxin No. 4, and Chunhong No. 1 belong to this type. Sowing amount: 0.75kg of seeding, 1-1.5kg / mu of sowing.
Cultivation techniques: To determine the suitable sowing period. Carrots are sown easily too early in spring; too late sowing causes fleshy roots to swell at a high temperature above 25 ℃, producing a lot of deformed roots. The suitable temperature for carrots to expand is 18-25 ℃. According to production experience, under the premise of selecting bolting-resistant spring seeding varieties, the seeds can be sown at an average daily temperature of 10 ° C and a night average temperature of 7 ° C. Generally, alpine regions such as northwest and northeast can be sown from late April to early May.
Soil preparation, fertilization, seed soaking and germination: deep tillage and fine raking before sowing, tilling depth is not less than 25cm. Combined with tillage, apply 15kg of phosphorus and potassium fertilizer and available nitrogen fertilizer per acre of land. Carrot seeds are not easy to absorb water and breath, and the low temperature in spring sowing causes the seeds to germinate and emerge slowly. In order to promote early germination and emergence, the seeds should be soaked and germinated before sowing. The method is to soak the seeds in warm water at 30 ～ 35 ℃ for 3-4 hours. ～ 4 days, stirring and rinsing regularly, after 80% ～ 90% of the seeds are exposed, they can be mixed with wet sand and sown. After sowing, evenly cover with a thin layer of soil, covered with plastic film, or replace with grass or straw.
Field management: To keep the soil moist after sowing, water immediately or suppress it to create conditions conducive to the germination and emergence of seeds. After the seedlings have emerged, remove the cover in the windless morning. 2 seedlings during the seedling period, the first one is performed when 1 to 2 true leaves are removed, and the poor seedlings, weak seedlings and overdense seedlings are removed; the second is performed when 3 to 4 leaves are true leaves, and the seedlings are fixed after the seedlings, and the plant spacing is determined 9cm, line spacing 15 ～ 18cm. Cultivation of weeds is the key to the high yield of carrots. Herbicides can also be used for weeding. Commonly used 50% grass weeding 450kg, water 75kg weeding. In addition, pay attention to cultivating soil when cultivating to prevent the succulent roots from exposing the ground to form green shoulders.
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