HORTICULTURE

Detailed explanation-1: -Soil is a major source of nutrients needed by plants for growth. The three main nutrients are nitrogen (N), phosphorus (P) and potassium (K). Together they make up the trio known as NPK. Other important nutrients are calcium, magnesium and sulfur.

Detailed explanation-2: -NPK (nitrogen, phosphorus, and potassium) are the main ingredients in most fertilizers. The letters NPK stand for the three major nutrients that plants need to live and grow – nitrogen, phosphorus, and potassium. Plants need other nutrients like iron, calcium, and even chlorine, but N, P, and K are the big three.