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.
Explanation not matching this question?क्या व्याख्या इस प्रश्न से मेल नहीं खा रही?Report
Q.12
Animal Reproduction - Gynaecology and Obstetrics- ICAR JRF/SRF 2024 (Q.20)
MCQ (Single Correct)+4−1
What is the role of "companion planting" in agriculture?
Companion planting: The agricultural practice of planting mutually beneficial plant species in close physical association to deter pests (e.g., marigold with tomato to repel nematodes, or aromatic herbs to mask crop scents), attract beneficial pollinators, or supply shade/support. (Correct answer)
Crop rotation: The sequential cultivation of different crop families over successive seasons to restore soil fertility.
Hydroponics: The technique of growing crops in water containing dissolved mineral nutrients without soil.
Cover cropping: Growing dense vegetation to protect against erosion and reduce soil compaction, not increase it.
Explanation not matching this question?क्या व्याख्या इस प्रश्न से मेल नहीं खा रही?Report
Report Issue / Suggest Correctionत्रुटि रिपोर्ट / संशोधन सुझाव
No official replies published yet for this questionइस प्रश्न पर अभी कोई आधिकारिक समाधान प्रकाशित नहीं है
Have an objection, typo, or doubt? Submit a report in Tab 1. Our subject experts will audit the question and publish the official resolution here.यदि आपको इस प्रश्न या उत्तर कुंजी में कोई आपत्ति है, तो 'त्रुटि रिपोर्ट' टैब से विवरण भेजें। हमारी विषय विशेषज्ञ टीम समीक्षा कर आधिकारिक समाधान प्रकाशित करेगी।