How about cabbage topdressing?

How about growing kale? how about topdressing? Please introduce the fertilizer requirements of heading cabbage, mainly nitrogen and potassium, and proper application of phosphate fertilizer. During the whole growth process, the combination amount of the three elements N ∶ P ∶ K was 3 ∶ 1 ∶ 4. According to the analysis of the growth stage, more chlorine was needed in the seedling stage and reached the peak in the rosette stage. More phosphorus and potassium are needed in the heading period, and the growth is the largest in the heading period, accounting for about 70% and 80% of the whole growing period. The specific method of topdressing is as follows: cabbage is planted for more than 10 days, and after watering and squatting seedlings, you can start topdressing for the first time, applying chemical fertilizer 10murl 15kg per mu or about 1000 kg of human feces and urine per mu to provide sufficient nutrients for rosette growth. In the early stage of rosette leaves, we can carry out secondary topdressing, appropriately increase the concentration of human feces and urine, and increase the application of available nitrogen fertilizer 15lv 20kg to accelerate the rapid growth of leaves. After entering the peak period of rosette, the third topdressing should be carried out, trenching or digging holes between rows, hedgerow organic fertilizer and ammonium sulfate, calcium superphosphate and other fertilizers, covering soil and watering after application, and then topdressing twice in the early and middle stages, each time 1520kg ammonium phosphate. In the late stage of cabbage heading, fertilizer is no longer applied. Click to get more cabbage planting techniques click to get more vegetable planting techniques