Three points for attention in the Management of Chinese Cabbage

It is necessary to fertilize Chinese cabbage with leaves as its products in time, which is very sensitive to the requirements of nitrogen, phosphorus and potassium. In production, not only basic fertilizer should be applied, but also topdressing should be carried out according to different growth periods. In the growing period, topdressing is mainly based on available nitrogen fertilizer, such as ammonium sulfate, ammonium bicarbonate, ammonium phosphate, urea and so on. The period of topdressing should be mastered well, which is generally divided into 4 times in seedling stage, rosette stage, heading stage and middle stage. Ammonium sulfate was applied 5 kg / mu at seedling stage, 1000 kg / mu at rosette stage, 15 kg / mu of ammonium bicarbonate or 10 kg / mu of ammonium sulfate at rosette stage, 25 kg / mu of ammonium bicarbonate or 15 kg / mu of ammonium sulfate at the beginning of heading, 1000 kg / mu of dilute manure, 10 kg / mu of ammonium carbonate or 1% urea solution. Vegetable farmers attach great importance to the control of the three major diseases of Chinese cabbage, but often ignore the prevention and control of insect pests. In fact, the occurrence and spread of many diseases are inextricably related to pests. Aphids are the main culprits for the transmission of viral diseases, which can cause Chinese cabbage to shrink and die; soft rot bacteria are mainly transmitted through insects, Rain Water and irrigation water, infecting Chinese cabbage from wounds. The wound caused by insect pests is beneficial for bacteria to invade and cause disease. Good control of cabbage green insects, yellow striped beetles and underground pests and reducing insect wounds can effectively reduce the occurrence of soft rot of Chinese cabbage. Therefore, pest control is also an important measure to control diseases. Delaying bundling can prevent Chinese cabbage from frost, promote ambition, and facilitate harvest. However, bundling should not be premature, because it is too early, the photosynthetic efficiency of outer leaves is greatly reduced, which hinders the normal growth of Chinese cabbage and is not conducive to the enrichment of leaf bulbs. Generally, 10-15 days before harvest, stop watering, lift the rosette leaves, hold the bulbs, and then tie the leaves with soaked sweet potato seedlings or cereal grass 3 to 5 centimeters from the top to make the core more solid and continue to grow.