I. Variety Selection: Early Spring Cabbage First, the vegetable farmer should choose cold-tolerant and chill-tolerant cold-resistant varieties. The mature varieties 50 to 55 days after planting were selected, or matured yellow cabbage varieties about 65 days old. In early spring cabbage seeds, vegetable farmers generally choose spring king of Korea, Chunxiao, new strong, Japan Liangqing, domestic strong, disease-resistant yellow core and so on.
Second, the growth of suitable temperature: the optimum temperature during growth in the range of 10 ~ 22 °C, higher than 25 °C will be poor growth early spring Chinese cabbage in the early and mid-planting susceptible to low temperature, to promote flower bud differentiation, late growth and vulnerable With high temperature, it is difficult to form a good leaf ball. The early spring varieties require strong low temperature resistance, are not easy to twitch and bloom, have a short growing period, are fast-frozen, have good quality, have high yield, and are listed early.
Third, early spring cabbage seedlings: Early spring cabbage seedlings are generally in the "spring" solar terms, acres with 10 grams. Seed preparation should be done well before planting. Choose about 5 square meters per acre. Use a small shed or a greenhouse to grow seedlings. About 5,000 seedlings per acre must be planted. Use a nursery bowl or paper bag to grow about 3,000 plants per acre and broadcast 1-2 plants per acre. After sowing, cover soil 0.5 centimeters, cover with plastic film, and add grasshopper insulation at night. During the nursery, the seedbed temperature is not lower than 13°C at night and kept at 25-28°C during the day. Excess ventilation should be performed at a temperature of more than 30°C. When the seedlings are released, the mulch film should be removed. The seedling age should be about 30 days.
Fourth, colonization: early spring cabbage planting time are in the "convulsion" solar terms. Planting requires seedling age 25 to 30 days, there are 4 to 5 true leaves; temperature is stable at 10 ~ 13 °C is appropriate, each planting 2 rows, spacing 40 cm, planting 2500 ~ 3000 per acre.
Fifth, field management: After transplanting, seedlings should be seedling-based, and root growth should be promoted. Afterwards, the fertilizer and water attacked each time, depending on the weather, water was poured once every 8 to 10 days, and urea was applied with 10 to 15 kg of water or 20 kg of nitrogen and potassium fertilizer per acre. Water should not be flooded and the water should be dampened. In the growing lotus stage, foliar fertilizer can be sprayed with 0.2% potassium dihydrogen phosphate and 0.2% urea, etc., and 0.7% calcium chloride can also be sprayed to promote the long-leafed leaves and prevent heartburn. At the same time, pay attention to air release to prevent the growth of soft rot caused by high temperature and humidity.
Six, pest control: early spring Chinese cabbage basic whole growth period does not need to control pests, generally do not have the occurrence of pests and diseases, such as the need for spraying can add some foliar fertilizer to spray mixed fertilizer to improve the control effect.
7. Harvest: The harvest period is generally from late April to early May.
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