The deficiency symptom of phosphorus is

Options

A. lodging of cereals
B. leaf curl
C. stunted growth
D. wrinkling of grains

Answer

### Step-by-Step Solution:

1. **Understanding Nutrient Deficiency**:
- Nutrient deficiency in plants can lead to various symptoms. Each nutrient plays a specific role in plant growth and development.

2. **Identifying Phosphorus Role**:
- Phosphorus is a macronutrient essential for energy transfer, photosynthesis, and the synthesis of nucleic acids.

3. **Recognizing Symptoms of Deficiency**:
- When plants lack phosphorus, they exhibit specific deficiency symptoms. The key symptom to note is stunted growth.

4. **Analyzing Other Symptoms**:
- The question lists other symptoms: logging of cereals, leaf curl, and wrinkling of grains.
- These symptoms are associated with deficiencies of other nutrients:
- Logging of cereals is often linked to excess nitrogen.
- Leaf curl is typically a sign of potassium deficiency.
- Wrinkling of grains can indicate nitrogen deficiency.

5. **Conclusion**:
- Based on the analysis, the primary deficiency symptom of phosphorus is stunted growth.

### Final Answer:
The deficiency symptom of phosphorus is **stunted growth**.

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