Planting techniques of Chinese cabbage in open field in early spring

Selection of varieties: early maturing varieties with short cycle, low temperature tolerance and good heat resistance in late stage should be selected. Sowing seedlings: When the spring temperature is maintained at more than 10 ° C, sowing should not be too early or too late. Soil preparation and fertilization: plowing and making beds, and applying base fertilizer. Reasonable planting: reasonable planting can be carried out in the morning on cloudy days, and plastic film shall be covered after planting. Post-management: thinning seedlings, weeding, watering and fertilization. Timely harvest: cabbage can be harvested when it reaches 7-8.

1. Selection of varieties

Before planting Chinese cabbage in the open field in early spring, we should first select early-maturing varieties with short growth cycle, early low temperature resistance and late heat resistance, such as Jinfeng, Qiangchun and Spring General.

II. Timely sowing

1. If the spring time is short in the north, the temperature difference is relatively large, so it is necessary to choose the sowing date reasonably.

2. If sowing is too early, because the temperature is relatively low, the seeds are prone to vernalization, and even frostbite may occur.

3, if the sowing is too late, so the spring time is relatively short, the temperature rises quickly, Chinese cabbage is more difficult to form leaf balls, but also lead to increased pests, so spring Chinese cabbage sowing needs to keep the temperature at about 10℃.

III. Sowing seedlings

1, general spring Chinese cabbage can be directly cultivated, can also be planted seedlings.

2, Chinese cabbage generally need to be one month in advance for seedling, temperature above 10℃, can be the wind barrier ridge or Yangqi irrigation water, such as complete penetration can be sown, the amount of sowing per mu is about 100-125 grams, and then covered with fine soil.

IV. Soil preparation and fertilization

1, planting early spring cabbage to choose fertile nutrition, loose soil area planting.

2. After selecting the planting land, the soil preparation can be carried out after thawing in spring, and the roots, broken mulch and other impurities of the previous crop can be removed completely. About 5000 kg of base fertilizer can be applied per mu, and then the flat ridge can be made after ploughing. The height of the ridge is about 1-1.5m, and the length of the ridge is about 20m.

5. Reasonable planting

1, early spring cabbage can be planted in the cloudy morning, try to avoid noon, can be dug in the ridge and then watered, row spacing in about 50cm, plant spacing in about 30-40cm is good.

2. When there is no water in the pit, you can plant cabbage seedlings, and then cover the soil. After planting, you can cover a layer of plastic film.

VI. Post-management

1. When the seedlings grow to 2, 4 and 7-8 pieces, they need to be thinned, which can be carried out together with weeding, leaving only one strong seedling in each pit.

2, seedlings need to be watered when the group, apply a quick-acting nitrogen fertilizer, each mu can be applied with urea 15-25 kg, and then every 7 days or so than a water can be.

VII. Timely harvest

When the cabbage heads reach 7-8, they can be harvested. Generally, they need to be harvested completely when they are fully mature.