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

Explanation

### Step-by-Step Solution:

1. **Understanding Hydroponics**: Hydroponics is a method of growing plants without soil, using a mineral nutrient solution instead. This method relies heavily on the quality of the water and nutrients used.

2. **Importance of Pure Water**: The first requirement for creating a nutrient solution in hydroponics is pure water. This water should be free from any additional minerals or contaminants that could interfere with plant growth.

3. **Role of Nutrient Salts**: The second requirement is nutrient salts, which provide essential minerals needed for plant growth. These salts must also be pure and standardized to ensure that the plants receive the correct amounts of each nutrient.

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