Soil fertility and fertilizers MCQs OPSC-ASCO, AAO Old question paper

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19. Criteria of essentiality and nutrients given by arnon and stout in the year 1939.
The 17th nutrient discovered was Nickel(Ni)

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Beneficial nutrient - vanedium, silicon, cobalt,sodium

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Natural factors - cl,o,r,p,t
Climate and organism- active factor
Relief/topography, parent material, time -passive factor.
Natural factors given by Jenny.
Later jaffer divided it into active and passive factors.

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6 ka c ans

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So the final answer of question no 17 is -D