The vegetable heart, also known as the vegetable dish, is a vegetable that is eaten by a flower pot. Its soft texture, fresh fragrance, high nutritional value, is a variant of Chinese cabbage. In recent years, the cultivation area of ​​Chinese cabbage in northern China has been expanding year by year and has been welcomed by consumers. The vegetable heart can be cultivated all year round. It is of great significance for the annual production and supply of vegetables. First, planting seedlings Fertile seedlings are transplanted or broadcast live. Most of the production uses transplanting seedlings. Before nursery, the nursery beds should be finished, and 1.2 to 1.5 meters wide flat rakes should be made. Apply enough organic fertilizer. Before sowing, water is poured and sowing is spread. Because the seeds of Chinese cabbage are small, they can be mixed with 3 to 4 times fine soil or river sand. After sowing, cover a thin layer of fine soil. In the spring, nursery must master the temperature, and the seedling germination and seedling growth of Brassica chinensis is suitable for 25°C-30°C. If the room temperature is too low, the seedlings will pass vernalization earlier, and the plants will fail to bloom before they grow into flowers. Seedlings need to be seedlings 1 to 2 times after the true leaves are unfolded. The seedling distance is about 5 cm. When the seedling grows 4 to 5 true leaves, it must be planted in time. The seedling age is 20 to 25 days, and even late-maturing varieties should not exceed 30 days. Summer and autumn seasons are suitable for live broadcasting. The amount of seed used for direct seeding is 250-300 g. The planting area must be filled with organic fertilizer, and it requires irrigation and drainage. In spring and autumn, flat rakes are used, and sorghum is suitable for cultivation in summer. Drilling or sowing, according to the row spacing 15 to 20 cm open shallow ditch, broadcast. Second, planting The fertile loam soil should be chosen as the planting site. Before planting, 3000 kg of organic fertilizer should be applied per acre. After the deep plowing, the flat bamboo shoots should be flattened and made into 1.2 to 1.5 meters wide flat ridges (small sorghum in summer). Before planting, the seedbed should be thoroughly smashed, and the seedlings can be planted while the water is infiltrated. Immediately after planting, watering, and then pouring water for 3 to 4 days, in order to ease the seedlings, and timely planning. Third, field management Top dressing is quick-acting nitrogen fertilizer, topdressing 2 times every 5~7 days, topdressing 5~10 kg urea per acre, watering immediately after topdressing. In addition, depending on the seedling situation, the vegetable shrivel should be properly applied when it is weak or yellow, and the fertilizer should be fertilized and watered in a timely manner after multiple harvests. IV. Pest Control The main diseases are downy mildew, soft rot and viral diseases. Downy mildew can be controlled with 75% chlorothalonil or 72.2% Preco spray; soft rot can be controlled by sprays such as agricultural streptomycin; viral disease focuses on the control of aphids, and virus A can be initially sprayed. Insect pests mainly include cabbage caterpillars and aphids. The use of biological insecticides such as BT emulsions for control of cabbage caterpillars, low-toxicity pesticides such as cockroach pine and once-in-a-net can be used for aphids, and attention should be paid to the interval between drug use.
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