'A' value concept was given by

A. Sorenson

B. Beckett

C. Schofield

D. Fried and Dean

Answer: Option D

Solution(By Examveda Team)

‘A’ value concept is given by Fried and Dean in 1952.
It is the phenomenon when a plant is confronted with two sources of a given nutrient, the plant will absorb from each of these in proportion to the respective amounts available.