Explain why fertilizers are added to soil.

Explanation

**Step-by-Step Solution:**

1. **Definition of Fertilizers**: Fertilizers are chemical substances that are manufactured in factories and are added to the soil to enhance its nutrient content.

2. **Purpose of Adding Fertilizers**: The primary reason for adding fertilizers to the soil is to improve the fertility of the soil. Fertility refers to the ability of the soil to provide essential nutrients to plants.

3. **Nutrient Contribution**: Fertilizers supply essential nutrients that plants need for growth. The most commonly added nutrients are nitrogen, phosphorus, and potassium. Among these, nitrogen is particularly important as it promotes the growth and greening of plants.

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