Young shoot tips are deformed as the young leaflets are not developed properly. Remaining leaf stubs show dark brown necrosis.
Calcium deficiency is seldom seen on the leaves, as most soils contains enough calcium for leaf growth.
Calcium deficiency
Boron deficiency causes similar symptoms, but necrosis is normally seen between the veins and not only at the edge of the leaf as with calcium deficiency.
Potassium deficiency causes necrosis at the edge of the leaf, but symptoms are first visible on the older leaves. The leaves with potassium deficiency normally do not curl up.