Step 1: Role of humus in soil.
Humus is important for agriculture because it improves soil structure, making it looser and better for plant roots to penetrate. It also enhances water retention and drainage in the soil, which is vital for plant growth.
Step 2: Nutrient supply.
Humus provides essential nutrients to the plants, such as nitrogen, phosphorus, and potassium, which are necessary for healthy plant growth. It also increases the soil's ability to hold these nutrients, reducing the need for chemical fertilizers.