Calcium is a secondary nutrient crucial for crop development and is required in large amounts by all plants for the formation of cell walls and cell membranes. Calcium also plays a vital role in soil structure. 

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However, being only xylem mobile (transportation of water and dissolved minerals through the roots, up the stem and to the leaves), Calcium can only move up the plant and cannot be remobilized once in place, meaning that new developing tissues will require new supplies of calcium for growth. As such, growing points and fruiting bodies tend to be affected the most once soil reserves are depleted. 

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Due to calcium’s low mobility in the plant, we can see calcium deficiency even in soils with high calcium levels. Therefore, a need for a continuous supply of calcium accessible is extremely important to plants for healthy growth.