Chinese cabbage is a leafy vegetable with a large number of leaves, and the core forms a leaf ball. It is the main harvesting organ. Generally up to 4000-5000 kg per mu. The growth period of Chinese cabbage is long. In order to obtain high yield, several key technologies must be mastered: 1. Apply base fertilizer: Basal fertilizer is the basis for the harvest of Chinese cabbage. In general, the soil fertility of the old vegetable plots is relatively high, and organic manure can be applied in an appropriate amount. The proportion of nutrients in compound fertilizers is dominated by nitrogen and potassium, with the application of phosphate fertilizer. The new vegetable plots should be re-applied with organic fertilizers, with the application of ternary compound fertilizer. 2. Rosette seedlings: Water control nitrogen fertilizers should be controlled during the seedling period. In addition to raising seedlings, it is generally necessary to plant seedlings during the rosette period so that the outer leaves of the shoot grow robustly and promote the roots to lay down, laying the foundation for rapid growth and absorption of nutrients and water in later stages. 3. Topdressing: The first time the top dressing is to be mastered during the late period of the rosette period, it is combined with irrigation. Top dressing is mainly composed of quick-acting nitrogen fertilizer and potash fertilizer. After water and fertilizer, it enters the heart-filling period. The first 2-3 top dressings are carried out in the early and middle period of Baoxin. The main topdressing nitrogen fertilizer, up to two times, control the amount. In the later period of time, nitrogen fertilizer was stopped. The amount of nitrogen fertilizer for each top dressing depends on the growth of Chinese cabbage. 4. Foliar Spraying Fertilizer: In the high-yield fertilization of Chinese cabbage, in addition to sufficient N, P, and K elements, the application of medium and trace elements should also be considered. From the current problems in the production of Chinese cabbage, some areas are mainly the problem of the physiological deficiency of calcium and boron. You can choose to spray foliar fertilizers containing calcium, boron, and iron. Insulin Syringes Needle,Disable Syringe,Monoject Syringe,10 Ml Syringe FOSHAN PHARMA CO., LTD. , https://www.forepharm.com