Under low boron condition, the boron pool capacity of the boron inefficiency cultivar was decreased by magnesium, and aggrandizing the boron deficiency in shoot.

• 镁在一定程度上可以使硼向有利于其移动的形态转化，提高硼库容量，但在低硼、低镁时，却减少硼低效品种硼库容量，加剧地上部硼的缺乏。