First, the selection of good varieties should be short-lived, generally about 50 to 60 days, strong winter, not easy to twitching the ball variety. Suitable varieties are Jianchun, Yangchun, strong, spring and summer king. Second, the cultivation of strong seedlings in the early spring of the year, the Chinese cabbage can be twitched by vernalization. In order to make the early spring cabbage, the spring convulsions should be avoided. It is necessary to raise seedlings in a greenhouse, a hotbed or a modified impotence, and keep the temperature in the seedbed as low as 15 °C as much as possible to avoid the low temperature and premature completion of vernalization, resulting in unnecessary losses. Seedlings are generally planted at the end of December to mid-January. Soak the cabbage seeds with warm water, then place them on a cloth that is well permeable and breathable at 20 to 28 °C. When preparing nutrient soil, mix black soil, manure, decomposed horse manure, and a small amount of sieved ash, and smear it into a mud layer of 4 to 5 cm thick, and cut it into 4 cm long and 4 cm wide earth with a fork, and then The seeds of the newly exposed buds are sown on each earthwork, and cannot be re-broadcasted and covered with a layer of fine soil after the broadcast. Third, scientific colonization early spring small arch shed ball cabbage is generally planted in mid-March. The leaves of the cabbage seedlings should not exceed 6 pieces, and when more than 6 leaves are colonized, it may cause vernalization. The row spacing is 50-55 cm, the plant spacing is 40-45 cm, and the number of plants per mu is 3000. Fourth, the management of fertilizer and water is only 50 to 60 days due to the growth period of spring cabbage, so it is necessary to apply enough base fertilizer and promote the main. That is, in the early stage of growth, a quick-acting nitrogen fertilizer, such as urea, is applied to promote vegetative growth, so that it can rapidly form rosette leaves and bulbs. Due to the low temperature and ground temperature in the seedling stage, watering should be controlled, and the main cultivation should be carried out. After the rosette leaf stage, the fertilizer should be promoted. The ball-forming period should be more relative to the application of potassium fertilizer, followed by nitrogen fertilizer. Generally, potassium sulfate or potassium dihydrogen phosphate is required to be 20-25 kg per mu, and urea is 10-15 kg. In the early stage of the ball, the cabbage cabbage 600-800 times solution can be sprayed 2 to 3 times to make the core solid. Fifth, the prevention and control of pests and diseases Relative to the summer and autumn cabbage, spring cabbage has fewer pests and diseases. Some parts of the plot may have downy mildew, and may be sprayed with drugs such as ethylphosphorus, aluminum, chlorpyrifos, and antidote in the early stage of the disease. Insect pests mainly include aphids and cabbage caterpillars. Aphids can be controlled by oxidized dimethoate, Wanling and other chemicals. The cabbage caterpillar can be sprayed with 2 to 3 years old pests with Bt emulsion, chlorpyrifos No. 1, and deltamethrin. Sixth, timely harvest of spring cabbage can be listed in the solid leaf, and the sooner the better, the harvest before and after the mango species. If the harvest is too late, the temperature rises, causing the cabbage to be soft and rotten. Disclaimer: Some articles on this website are transferred from the Internet. If legal rights of third parties are involved, please inform this website. phone Thoracoscopic Scissor Trocar Suction,Laparoscope Thorax Trocar,Surgery Thorax Trocar,Thoracoscopy Instruments Forceps ZHEJIANG SHENDASIAO MEDICAL INSTRUMENT CO.,LTD. , https://www.shendasiaomed.com