Spring carrot cultivation techniques

In recent years, with the continuous improvement of the people's living standards, the area of ​​spring carrot sowing in the off-season has been continuously increasing. The spring sowing carrot cultivation techniques are introduced as follows.

I. Variety Selection and Seeding Rate Spring-seeding varieties should use varieties that are resistant to bolting, good quality, high yield, and medium-early maturity. Such as the new Kuroda 5 inch, red core 4, and Chunhong No. 1 varieties belong to this type. Seeding capacity: drilling 0.75kg, sowing 1 - 1.5kg/mu.

Second, cultivation technology

1, determine the suitable sowing date carrot early springing easy to convulsions; too late sowing leads to root swelling of the meat in the high temperature period above 25 °C, resulting in a large number of deformed roots, carrot root swelling suitable temperature at 18 ~ 25 °C. According to the production experience, under the premise of selecting the spring-resistant varieties that can resist twitching, the seeds can be sown at a daily average temperature of 10°C and a night-average temperature of 7°C. The northern part of North China is usually planted at the beginning of April. The southern part of North China is sown in late March; the central and southern parts of China can be planted in early March; the north, northeast and other high-cold areas can be sown from late April to mid-May.

2. Soil Fertigation and Seed Soaking The germination of carrots is a root vegetable crop. The soil with deep soil, fertile soil, and well-drained sandy loam or loam should be selected. Deep plowing before sowing, farming depth of not less than 25cm. Combining ploughing, 5,000 m2 of farmyard manure is applied per 667 m2, and phosphorus and potassium fertilizers and 15 kg of available nitrogen fertilizer are used. Carrot seeds are not easy to absorb water and breathable, coupled with the low temperature of spring sowing, resulting in slow seed germination and emergence. In order to promote early germination and emergence, soaking and germination should be carried out before sowing by soaking in warm water of 30-35°C for 3～4h, removing it with a wet towel or bag, and placing moisturizing at a temperature of 25-30°C. 4 days, regular stirring and rinsing, until 80% to 90% of the seeds can be mixed with wet sand after soaking, after sowing, evenly covered with a thin layer of soil, covered with plastic film, can also be used instead of grass or straw.

3. Keep the soil moist after sowing in field management. Immediately water or water after suppression to create conditions conducive to seed germination and emergence. After the seedlings are released, the cover shall be removed in the morning without wind. Seedlings 2 times during seedlings, the first time in 1 to 2 true leaves, remove the bad seedlings, weak seedlings and over seedlings; the second time in the 3 to 4 leaves of the true leaves, after the seedlings will be fixed, the seedling spacing 9cm, spacing 15 ~ 18cm. Cultivated weeding is the key to the high yield of carrots. Herbicides can also be used for weed control. Commonly used 50% paraquat 450kg and water 75kg weeding. In addition, pay attention to soil during the cultivator to prevent the top of the fleshy root from forming the green shoulders. In order to produce carrots with high yields, we must top-dress fertilizer 1 or 2 times throughout the growing period. The first time was carried out 5 to 7 days after the start of seedlings, combined with 3 kg of ammonium sulfate per 667m2 of water, PK fertilizer and 3 kg of water. The first time in 8 to 9 true leaves, that is, in the early stage of fleshy root enlargement, it is also the period when the amount of water is the most. In combination with watering, 7.5 kg of ammonium sulfate is applied per 667 m2, and each 3.5 kg of phosphorus and potassium fertilizer.

4. Timely harvesting of spring sowing carrots in late March sowing, generally in late June to early July harvest, but also timely harvest according to market demand. When mature, the leaves no longer grow, no new leaves are seen, and the lower leaves turn yellow. If there is 0 ~ 3 °C cold storage, storage after harvest, can supply the entire summer.