Definitions of Heavy Metals, Essential and Beneficial Plant Nutrients
Heavy metals are defined as metals with a density higher than 5 g cm−3. Of about 90 naturally occurring elements, 53 are considered as heavy metals. A total of 18 elements are considered essential for plant nutrition. A few of the elements are considered beneficial. They are not essential for plant nutrition but provide indirect benefit to the plants and animals who consume the plants.
KeywordsHeavy Metal Nitrogen Fixation Sewage Sludge Plant Nutrition Phosphatic Fertiliser
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