Deficiencies of nitrogen, phosphorus and potassium can be corrected by fertilizing.
The primary symptom of nitrogen deficiency is an overall yellowing of the leaves, beginning with the oldest leaves. As the older leaves are depleted of nitrogen, they may drop.
Small, dark green leaves with a blue to purple tinge can be an indication of a phosphorus deficiency. The symptoms occur first on the older leaves, and the lower leaves may turn yellow.
The margins of older leaves become chlorotic, then scorched. The leaf margins may also curl downward. The older foliage drops prematurely, giving the plant a sparse look.
|Visual title - Visual size||Visual title - Visual size|
|Manganese deficiency on red maple, close up - 32K||Manganese deficiency on maple - 42K|
|Nutrient deficiency on juniper - 50K|