Calcium deficiency (plant disorder)

At times, even with sufficient calcium in the soil, it can be in an insoluble form and is then unusable by the plant or it could be attributed to a "transport protein".

As a result, a homeostatic balance between Ca and Mg within the plant is necessary for optimal growth and proper development.

[4] Calcium deficiency symptoms appear initially as localized tissue necrosis leading to stunted plant growth, necrotic leaf margins on young leaves or curling of the leaves, and eventual death of terminal buds and root tips.

[3] Plant damage is difficult to reverse, so corrective action should be taken immediately, supplemental applications of calcium nitrate at 200 ppm nitrogen, for example.

[14][15][citation needed] [16] Early fruit will generally have the worst symptoms, with them typically lessening as the season progresses.