Fe deficiency is mostly seen in crops... | Computer Application

ICAR JRF Computer Application 29 Jun 2024Shift 1

MCQ (Single Correct) +4 −1

Fe deficiency is mostly seen in crops growing on

Calcareous or alkaline soils Correct Salt affected soils Acidic soils Neutral soils

Calcareous or alkaline soils: Under high pH ($pH \gt 7.5$) and abundant free calcium carbonate ($CaCO_3$), iron precipitates into insoluble ferric hydroxides and carbonates ($Fe(OH)_3$), severely reducing bioavailable $Fe^{2+}$ and triggering characteristic lime-induced iron chlorosis in young leaves. (Correct answer)
Salt affected soils: Primarily induce osmotic drought and specific ion toxicities (excess $Na^+$ and $Cl^-$).
Acidic soils: Low pH increases iron solubility, frequently causing iron toxicity rather than deficiency.
Neutral soils: Offer optimal micronutrient availability without precipitation.

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