To re-apply nitrogen fertilizer as a premise, fertilizer use should grasp the principle of "before light and heavy", top dressing is generally divided into 2 to 3 times, the first top dressing should be in the early stage of rosette, apply 10-15 kg of urea per acre, sulfuric acid Potassium 5 to 10 kg. Into the balling period can generally use three yuan compound fertilizer, the amount of about 50 kg per acre, split the ball in the early and middle two applications. Should adopt foliar topdressing, available 0.3% ~ 0.5% calcium chloride spray, once every 7 days, 2 or 3 times in a row can be achieved control effect, make-up application of fertilizer Cabbage is more sensitive to boron, the lack of boron on The impact of yield is greater. For boron-deficient soil, boron fertilizer should be applied. Boron fertilizer can be used as basal fertilizer, applying 1 kg of borax per acre, mixed with other fertilizers, and applied to the soil. Such as base fertilizer boron deficiency, in the rosette period to the ball stage spray 0.1% ~ 0.2% borax solution, spraying every 6 to 7 days, 2 or 3 times in a row, the effect is satisfactory.
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