Why is purification of water and nutrient salts so important in studies involving mineral nutrition using hydroponics?

Explanation

### Step-by-Step Text Solution:

1. **Understanding Hydroponics**: Hydroponics is a method of growing plants without soil, using a nutrient solution that provides all the essential minerals and nutrients directly to the plant roots.

2. **Role of Water and Nutrient Salts**: In hydroponics, the plants rely entirely on the nutrient solution for their growth. This solution must be carefully formulated to include all necessary nutrients in the right concentrations.

3. **Importance of Purification**: The purification of water and nutrient salts is crucial because:
- **Contamination Risks**: Any contaminants in the water or nutrient solution can inhibit plant growth. Contaminants may include harmful bacteria, viruses, or toxic substances that can adversely affect the plants.
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