18
Seed Science and Technology- ICAR JRF/SRF 2024
MCQ (Single Correct)
+4
−1
Fe deficiency is mostly seen in crops growing on
EXPLANATION
Soil Science, Plant Nutrition & Reclamation
- 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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