In plants, the most common nutrient deficiencies are of ………………………………, ………………………………… and ……………………………..

Explanation

**Step-by-Step Solution:**

1. **Identify the Question**: The question asks for the most common nutrient deficiencies in plants.

2. **Recall Common Nutrient Deficiencies**: The three most common nutrient deficiencies in plants are well-documented in plant biology. These are typically nitrogen, phosphorus, and iron.

3. **Explain Each Nutrient**:
- **Nitrogen**: This is the most required nutrient by plants. It is essential for the synthesis of proteins and nucleic acids, and is crucial for the growth of meristematic tissues.
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