Question:
Khaira disease in rice is associated with the deficiency of
Khaira disease in rice is associated with the deficiency of
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Khaira disease of rice $\rightarrow$ Zinc (Zn) deficiency. Discovered by Y.L. Nene (1965) at Pantnagar. Corrected by applying $\text{ZnSO}_4$ @ 25 kg/ha.
Updated On: Sep 4, 2026
- Potassium
- Iron
- Boron
- Zinc
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept:
Khaira disease is a widespread physiological disorder of wetland rice caused by micronutrient zinc (Zn) deficiency, first discovered by Dr. Y. L. Nene in 1965 at Pantnagar.
Step 2: Detailed Explanation:
In flooded wetland paddy soils, submerged anaerobic conditions cause reduction and precipitation of zinc into insoluble zinc sulfide (ZnS) and zinc carbonate (ZnCO$_3$), drastically reducing zinc availability.
Symptoms appear on younger leaves as chlorosis and characteristic reddish-brown or bronze pigmentation.
Foliar spray or soil application of zinc sulfate ($\text{ZnSO}_4$) effectively controls this deficiency.
Step 3: Final Answer:
Therefore, Khaira disease in rice is caused by the deficiency of Zinc, matching option (D).
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