In early spring, Chinese cabbage is popular because of its high yield, easy cultivation, good flavor and rich nutrition. Early spring Chinese cabbage is cultivated in off-season, and it has higher economic benefits. In recent years, planting benefits are superior to other vegetables, and it is highly valued by vegetable farmers. At present, the western townships of Gu'an County in Langfang City have been used as the main cultivars of vegetable farmers. In the early spring, the cultivation of vegetable farmers must first do a good job of preparation. That is, before the land is sealed in the winter, it is necessary to plan the ridge and apply the base fertilizer.
First, the variety selection: early spring cabbage first vegetable farmers should choose cold-tolerant, cold-resistant varieties. Choose a mature variety from 50 to 55 days after planting, or a mature yellow core Chinese cabbage variety of about 65 days. Early spring Chinese cabbage seeds, vegetable farmers generally choose South Korea Spring King, Chunxiao, new strong, Japanese Liangqing, domestic strong, disease-resistant yellow core.
2. Suitable growth temperature: The suitable temperature during the growth period is in the range of 10-22 °C, and the growth is higher than 25 °C. Early spring cabbage is susceptible to low temperature in the early and middle stages of planting, which promotes flower bud differentiation and is susceptible to late growth. It is difficult to form a good leaf ball due to high temperature. Early spring varieties require high temperature resistance, low twitching and flowering, short growth period, fast ball formation, good quality, high yield and early market.
Third, early spring cabbage breeding: early spring cabbage cultivation time is generally in the "Lichun" solar terms, 10 grams of acres. Before planting, we must do a good job in seedbed preparation. Choose about 5 square meters per mu. Apply shed or greenhouse seedlings, and need about 5,000 seedlings per acre. Use seedling bowls or paper bags, plant about 3,000 plants per acre, and 1-2 capsules per acre. After sowing, cover the soil by 0.5 cm, cover the mulch, and add grass to keep warm at night. During the nursery period, the temperature of the seedbed is not lower than 13 °C at night, and is maintained at 25-28 °C during the daytime. When the temperature exceeds 30 °C, the wind should be released at the right time. When the seedlings are removed, the mulch film should be removed. The seedling age is about 30 days.
Fourth, colonization: early spring cabbage cultivation time is in the "shock" solar terms. When planting, the seedling age is required to be 25 to 30 days, and there are 4 to 5 true leaves; the temperature is stable at 10 to 13 °C, and each row is planted with 2 rows, the plant spacing is 40 cm, and 2500 to 3000 plants per acre are planted.
V. Field management: After planting, the seedling stage should be based on seedlings to promote root growth. After the fertilizer and water attack, depending on the weather conditions, water is poured every 8 to 10 days, and 10 to 15 kilograms of urea or 20 kilograms of nitrogen and potassium fertilizer are applied per acre with water, avoiding flooding with large water, watering can be based on dampness Foliar fertilization in the growing rosette period, spraying 0.2% potassium dihydrogen phosphate and 0.2% urea, and spraying 0.7% calcium chloride to promote the long leaves and prevent heartburn. At the same time, pay attention to the release of wind to prevent the spread of soft rot caused by high temperature and high humidity.
Sixth, pest control: Early spring cabbage has no need to control pests and diseases during the whole growth period. Generally, no pests and diseases occur. If you need to spray, you can add some foliar fertilizers to mix medicines and fertilizers to improve the control effect.
7. Harvesting: The harvest period is generally from late April to early May.
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