ABSTRACT
In the Wikipedia deƒnition (www.Wikipedia.org) of plant nutrition, fourteen elements are given as essential nutrients (the author would choose the word “element” in place of “nutrient”), to include the element Ni, an element that has not been widely accepted as being essential, although its identiƒcation as a micronutrient is becoming commonplace in both the technical and scientiƒc literature (see Chapter 13, “Elements Considered Beneƒcial to Plants”). The three elements C, H, and O are not considered plant nutrient elements in the Wikipedia deƒnition. The author classiƒes these three as “structural elements” because they are the primary elements comprising those substances in plants that form the plant skeleton (cell walls, conductive tissue, etc.).
