在大量营养元素(N,P,K,Ca,Mg,S)中,甘蓝植株对氮素需要最多,以用于甘蓝结球。在任何不同生长阶段吸收氮素经常有助于叶球形成。而磷,镁及硫在较晚生长阶段吸收,对结球几乎是无用的。氮适量供给外叶发展阶段的甘蓝,主要输入外叶,而正常的外叶发育为光合作用的器官。正常的外叶能产生丰富的光合产物并在叶球发育阶段输送到内层球叶。然而,当没有或仅有极少的氮供给植株,则无叶球发育。这就是说,甘蓝植株吸收 Among a large number of nutrients (N, P, K, Ca, Mg, S), cabbage plants need the most nitrogen for cabbage clumping. Absorption of nitrogen at any stage of growth often contributes to the formation of leaf spheres. Phosphorus, magnesium and sulfur, which are absorbed at the later stages of growth, are almost useless to the ball. The amount of nitrogen supplied to the outer leaves of the cabbage stage of development, the main input of the outer leaves, and normal outer leaves developed into photosynthetic organs. Normal outer leaves produce abundant photosynthate and transport to inner globule during leaf development. However, leafless development occurs when little or no nitrogen is supplied to the plants. This means that cabbage plants absorb