UPSC CDS 2 2021 GK Paper

Most fertilizers that are commonly used in agriculture contain the three basic plant nutrients: nitrogen, phosphorus and potassium. Iron is a micronutrient for plant growth which is not available in fertilizers. Iron helps the plant move oxygen throughout the roots, leaves and other parts of the plant, producing the green colour that lets you know your plant is healthy. Many plants also rely on iron to complete the enzyme functions that keep the plant thriving.