1. Variety selection: Choose medium-mature varieties from September to October. There are 60-day green stalk heart, green stalk willow heart, yellow leaf center, and big flower ball center dish. From November to March of the next year, choose late-maturing varieties for cultivation in protected areas. The varieties include Chixin 29, Chicaixin 2, Guilin Twisted Leaf, and March Yuexin. 2. Site preparation and sowing: First of all, the soil should be deep turned 25-30 cm deep, the soil should be broken, finely leveled, combined with deep turning, 3000 kg of organic fertilizer can be applied and 25 kg of superphosphate. Flat borders can be used in early spring, late autumn, and high borders in early summer to late autumn to prevent rain and waterlogging. Live broadcast: 150-180 grams per mu. Nursery: 400-500 grams per mu. The sowing depth is about 1.2 cm, and can be broadcast or drilled. 3. Interplanting and planting: Seedlings are planted before and at the time of 3 leaves of seedlings, and seedlings are set in time at 5 leaves. The nursery field can be planted in time when the seedlings have 5 leaves. 4. Reasonable density: the number of early-maturing varieties is 32,000, and the spacing between rows is 16×13 cm. The number of late-maturing varieties is 16000-17000, and the spacing between rows is 22×16 cm. V. Field management: After the seedlings are planted or planted, the middle and early stage of growth should be cultivated and weeded 1-2 times in time, which is beneficial to soil moisture retention and aeration and timely elimination of weeds. Combined with pouring seedling water and planting water, 20 kg of ammonium sulfate or 10 kg of urea can be applied per mu. Combined with pouring lei water and then applying ternary compound fertilizer 25 kg/mu. In order to promote the growth and development of lateral moss, about 15 days after the main stem is harvested, and then apply about 15 kg of urea in combination with watering acres. 6. Prevention of diseases and insect pests: The main diseases of Chinese cabbage include downy mildew, black spot disease, soft rot and sclerotium disease, and the pests include cabbage borer, cabbage worm and aphids. It is necessary to carry out pharmaceutical prevention and control in time, and to observe the varieties of non-pollution vegetable production and the interval between safe medication. Disclaimer: Some articles of this website are transferred from the Internet. If the legal rights of third parties are involved, please inform this website for processing. phone Disposable Laparoscopic Trocar Disposable laparoscopic trocars are typically made of plastic or metal and are designed for single-use only. They are available in a range of sizes and shapes to accommodate different patient needs and surgical procedures. The trocar is typically inserted into the patient's abdomen using a technique called "blind insertion," which involves inserting the trocar through the skin without direct visualization of the underlying tissue.
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Field cultivation techniques of Chinese cabbage
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