Question
The criteria of essentiality was given by
………………. And it was redefined by………………Solution
Criteria of essentiality given by Arnon and Stout and it was redefined by Arnon in 1954. A plant cannot complete its life-cycle in the absence of the element. The action of the element must be specific, with no other element being able to completely substitute for it. The element must be shown to be directly involved in the nutrition of the plant.
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