NOTE: Since nickel (Ni) was only recently added as an essential nutrient, specific Ni deficiency symptoms are not well defined. Common symptoms include chlorosis and interveinal chlorosis in younger leaves.
*If symptoms don't meet any of the key descriptions, either go back through the key another time or refer to text for more specific symptom descriptions.
Source:- based on "Montana State University - Extension 4449-9, May 2009
Module 9 Plant Nutrient Functions and Deficiency and Toxicity Symptoms"
Above: Banksia integrifolia - with iron and magnesium deficiencies.
Below: Leptospermum sp - with magnesium deficiencies.