Plant nutrition is the study of the chemical elements and compounds necessary for plant growth, plant metabolism and their external supply. In 1972, Emanuel Epstein defined two criteria for an element to be essential for plant growth:
In its absence the plant is unable to complete a normal life cycle.
The element is part of some essential plant constituent or metabolite.
- Track 1-1 Leaf discoloration
- Track 2-2 Plant necrosis