This area is considered to be the earliest evolutionary center of carrots, with a cultivation history of more than 2000 years. Later, carrots were introduced to China and other Asian and European countries through the Silk Road, and gradually became a global vegetable. Carrots of origin are red. With the change of soil quality and climate conditions in different cultivation areas, the colors have also changed, such as purple, yellow and orange. The orange "carrot" seen in the market is planted in the Netherlands and has the same color as the original Dutch flag.
Carrots are annual or biennial herbs. Roots are stout, rectangular, conical, orange-red or yellow. Stems erect, 60-90 cm tall, much branched. Leaves with long stalks, 2-3 pinnate compound leaves, lobes linear or lanceolate, sharp at the apex and small at the end; The petiole base swells to form a leaf sheath.
breeding method
1, sowing date selection: sowing in February in spring, harvesting in May-July, sowing in July in autumn, and harvesting in February of1/-65438. In Guangdong, Fujian and other places, you can sow at any time from August to 65438+10, and harvest at any time in winter. In the middle and lower reaches of the Yangtze River, seeds are sown in early August and harvested at the end of June.
2. Soil management: carrots require sandy soil with deep and fertile soil layer, rich humus and good drainage. Sticky soil or poor drainage is prone to root cracking, root cracking and even root rot, which is especially unfavorable to long-rooted varieties. The topsoil should not be shallower than 30 cm, and the water content should be 60-80%.
3, thinning: generally divided into three times. For the first time, when the true leaves grow to 2-3 seedlings, the interval is1-2 cm; The second time, 5-6 pieces of seedlings are thinned, with an interval of 2-3 cm; The third pass depends on the situation, and the last interval is 3-5 cm.
The above contents refer to Baidu Encyclopedia-Carrots.