Chinese cabbage is a kind of popular vegetable that people like to eat. It likes a warm and cool climate. It has weak cold resistance and heat resistance. It often uses shading nets, small sheds to raise seedlings, and irrigation water. Measures to prevent the heat. I. Variety selection In summer and high temperature and high humidity season, it is necessary to select early maturing varieties that are resistant to heat, moisture, and stress, such as Zaza No. 5, Xiafu No. 2, Early-maturing No. 5, and Summer 45 days. Second, planting soil 1. Select the location as a planting site with convenient transportation, adequate water sources, convenient drainage and irrigation, and fertile soil. 2. The higher the summer season is, the higher the temperature of the seedlings, the rapid growth of the seedlings, the seedling age is only 22 to 28 days, and appropriate protective measures should be taken when planting the seedlings. In the late spring and early summer, because of the low temperature in the early morning and late spring, it is advisable to sow seedlings in small plastic sheds to plant seedlings in open plastic fields. In summer and early autumn, the summer season is hot and rainy, and sheds and small sheds are used to sow seedlings. Or after the adoption of live seedlings, watering and cooling seedling cultivation, and pay attention to drainage after the rain. 3. When transplanting soil preparation, it is best to apply lime of 75 to 100 kilograms per acre. This will help regulate the pH of the soil, increase soil calcium (anti-dry-heart), and it will also play a role in sterilization. Reasonable dense planting is beneficial to the early filling of the heart, thereby shortening the growth period and playing the role of precocious anti-convulsions and disease reduction. The planting density is generally controlled at 3,500 to 5,000 plants per acre, and 3,500 plants are suitable for planting in the late spring and early summer. The row spacing is 30 to 45 cm and the plant spacing is 30 to 40 cm. The shorter the growing season, the shorter the planting density can be increased. Third, field management 1. Temperature Chinese cabbage is generally completed at 10°C to 15°C at 10°C to 15°C. Therefore, the minimum temperature at the end of spring should be controlled between 10°C and 15°C. The field sowing requirement should be no less than 15°C. After trying to avoid the temperature below 10 °C, to prevent convulsions and flowering; summer heat should pay attention to shading and cooling seedlings, live pay attention to water cooling seedlings. 2. Fertilization The off-season Chinese cabbage has a short growth period. The management should be promoted mainly, and fertilizer and water should be timely and sufficient to promote the rapid growth of seedlings, which is beneficial to early ball-bearing and play the role of early maturation and disease resistance. The anti-season Chinese cabbage grows faster and the trace elements such as calcium and manganese are easily misaligned, which can easily cause the Chinese cabbage to "dry its heart." After entering the rosette period, it is best to apply 0.3% calcium nitrate once every 5 to 7 days. 0.3% manganese sulfate, 0.3% Baolifeng (Israel Haifa Chemical Industry Co., Ltd.) solution, three kinds of foliar fertilizer should be applied alternately. 1 seedling stage. When planting seeds and seedlings, the seedbed should be full of organic fertilizer, and a mixed fertilizer of urea and ternary compound fertilizer (with a ratio of 1:1, hereinafter referred to as compound fertilizer) 20 kg per acre seedbed. 2 After planting. After the planting seedlings return to green, fertilizer is applied in a timely manner. 500 kg of excrement or 20 kg of mixed fertilizer is applied to each acre of thin soil. With the growth of Chinese cabbage, 20 kg of ternary compound fertilizer or mixed fertilizer can be properly added, and the bale can be used once. Topdressing 40 kg of compound fertilizer, timely watering after topdressing. 3. When watering sowing, planting water should be enough to keep the bed moist so that the seedlings can be unearthed. Sub-seedling and planting should be timely watering, especially in the summer high temperature period, after planting should be poured with 1 to 2 days of early and late seedling water, after 5 to 7 days pouring 1 water, should not flood irrigation. During the rainy season, we must pay attention to drainage and flood control to prevent the occurrence of soft rot. IV. Pest Control During the summer and anti-season cultivation, it is in the high season of pests and diseases, and the frequency of spraying is very frequent. Therefore, preparations for chemical control must be prepared in advance from the beginning of the young seedlings. Msct Scanner,Gemstone Detector,Vascular CT Scan,Conventional CT Scan MinFound Medical Systems Co., Ltd , https://www.minfoundmed.com