Constituent of the middle lamella, having a role in maintaining the structure and functioning of cell membranes.
It is still important in the process of cell elongation and division. It also acts on root growth. Calcium (Ca) is required for pollen grain germination and pollen tube growth, which are essential for fertilization.
Deficiency – It starts in new leaves, which become whitish and curl downwards, forming a hook. Older leaves may look rusty. In places with more severe deficiency, there is a thinning and softening of the culms.