Calcium deficiency/ internal browning-Potatoes

Symptoms
Internal browning. Also hollow tubers are a symptom of calcium deficiency.

Reasons
Calcium deficiency Can be confused with boron deficiency. It is difficult to separate the symptoms.

Symptoms
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.

Reasons
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.

Symptoms
The margins of young, fully developed leaflets are cupped upwards. Calcium deficiency is seldom seen on the leaves, as most soils contain enough calcium for leaf growth.

Reasons
Calcium deficiency