The requirement of fertilizer for cabbage cabbage should be dominated by nitrogen and potassium, and appropriate application of phosphate fertilizer. During the entire growth process, the amount of three elements N:P:K was 3:1:4. From the growth stage analysis, more chlorine was needed during the seedling period, and reached the peak during the rosette period. Phosphorus and potassium are needed to reach the ball stage, and the growth period during the ball stage is the largest, accounting for 70%-80% of the entire growth period.
The specific topdressing method is: cabbage planting more than ten days, after watering, cultivating seedlings, you can start the first top dressing, chemical fertilizer 10-15 kg per mu or about 1,000 kg of human waste, to provide sufficient growth for the rosette period nutrient. In the early stage of rosette leaves, secondary dressing may be carried out, and the concentration of human excrement and urine may be increased appropriately, and 15-20 kg of available nitrogen fertilizer may be increased to accelerate the rapid growth of the leaves. After entering the rosette for the third time, the topdressing can be carried out. Ditching or digging holes should be performed between the rows to trap the organic fertilizer and fertilizers such as ammonium sulfate and superphosphate. After the application, the soil should be reconstituted and watered, and then enter the ball, in the early stage. In the mid-term, top-dressing was performed twice, each time applying 15-20 kg of ammonium phosphate. To late cabbage ball, generally no longer chase fertilizer.
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