First, the nutritional characteristics of Chinese cabbage. About 1.5 kg of nitrogen (n), 0.7 kg of phosphorus (p2o5), and 2.0 kg of potassium (k2o) are absorbed per 1,000 kg of Chinese cabbage. The ratio of nitrogen, phosphorus, and potassium is approximately 1:0.46:1.33 throughout the growing season. Absorption of potassium in the most, followed by nitrogen, at least phosphorus. Chinese cabbage is sensitive to sulphur. It is certainly good to use sulphur-based fertilizers for crops that are not chlorine crops or have poor resistance to chlorine. However, the production practices in recent years have proved that if the open-air cultivation is not saline soil, the water seepage is good, and the application of chlorine-based fertilizer will not affect the yield. Chinese cabbage is easily deficient in calcium, and Hebei Province is a calcareous soil area. The soil is rich in calcium, which is mainly due to the impact of the application of a single ammonium nitrogen fertilizer on calcium absorption. Second, the vegetative growth stage of Chinese cabbage. After seedling emergence, the seedling stage, rosette stage (ie, the regimental stage), the bulbous stage, and the bulbous stage were successively entered. The number of days early in the seedling stage is 12 to 15 days, and that of the late-maturing varieties is 17 to 18 days, 5 to 10 leaves have been grown; the accumulated days in the rosette stage are 20 to 21 days for early maturing varieties, and the late-maturing varieties are 27 to 28 days; The cumulative number of days of early maturing varieties 25 to 30 days, late-maturing varieties of 40 to 45 days; the cumulative number of days of the ball period accounted for half of the whole growth period, the growth of the total weight of 2/3 ~ 3/4. Meet the above-mentioned major growth stages of nutrient demand is the key to high quality and high yield. Third, the main points of Chinese cabbage fertilization. 1, base fertilizer: first to apply the base fertilizer, Mushi good organic fertilizer rot 3000 ~ 5000 kg, with the appropriate formula fertilizer 30 ~ 40 kg, spread before the ground to spread, do soil and fertilizer blend, formula fertilizer preferred 18- Sulfur bases such as 12-20, 18-12-18, and 16-16-16 can also be used in chlorine-based types such as 19-19-19, 18-18-18, and 17-17-17. 2. Top-dressing: Top-dressing cabbage mainly catches the seedling stage, rosette stage and ball stage. Fertilizers such as 18-12-20, 18-12-18, and 34-0-16 should be used as top dressings according to the base fertilizers applied, and the top-fertilizer seedlings may not be top-dressed. If the ball period can be matched with topdressing nitrate fertilizer is better. The amount of fertilizer for each mu is 15 to 20 kilograms. Can be applied between the rows of the ditch, between the points of the plant and timely covering the soil, preferably with water, rosette stage and ball stage inconvenience operations can be combined with water irrigation facilities. Source: Hebei Rural News Veterinary Vaccine,Inactivated Vaccine,Combined Inactivated Vaccine,Combined Nd Ib Ai Killed Vaccine Shangqiu Meilan Biological Engineering Co.,Ltd , https://www.melanvaccine.com