Step 1: Understanding the Concept:
This question tests knowledge of beneficial nutrients for specific crops.
Step 2: Detailed Explanation:
Silicon (Si) is a beneficial nutrient for rice crop.
Role of silicon in rice:
- Strengthens cell walls, making plants more resistant to lodging.
- Improves resistance to pests and diseases (especially blast disease).
- Enhances photosynthesis and nutrient uptake.
- Increases tolerance to abiotic stresses (drought, salinity, heavy metals).
Other nutrients:
- Sodium (A): Not a beneficial nutrient for rice.
- Cobalt (B): Beneficial for nitrogen fixation in legumes.
- Vanadium (D): Not a beneficial nutrient for rice.
Thus, silicon is the beneficial nutrient for rice.
Step 3: Final Answer:
Thus, silicon is the beneficial nutrient for rice crop.
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