The three elements most commonly added to agricultural soils in fertilizers -

Options

A. N, P, Fe
B. N, K, Fe
C. N, P, K
D. N,S,Fe

Answer

**Step-by-Step Solution:**

1. **Understanding Fertilizers**: Fertilizers are substances added to soil to provide essential nutrients that plants need for growth. They often contain a mix of macronutrients and micronutrients.

2. **Identifying Macronutrients**: Macronutrients are nutrients that plants require in larger quantities. The three primary macronutrients for plants are nitrogen (N), phosphorus (P), and potassium (K).

3. **Common Elements in Fertilizers**: Among the various nutrients, nitrogen, phosphorus, and potassium are the most commonly added to agricultural soils in fertilizers. This combination is often referred to as NPK.

4. **Excluding Other Options**: Other elements such as iron (Fe) and sulfur (S) are also important for plants but are considered micronutrients or secondary nutrients. Micronutrients are required in smaller amounts compared to macronutrients.

5. **Conclusion**: Therefore, the three elements most commonly added to agricultural soils in fertilizers are nitrogen (N), phosphorus (P), and potassium (K).

**Final Answer**: Nitrogen (N), Phosphorus (P), and Potassium (K) are the three elements most commonly added to agricultural soils in fertilizers.

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