1. Soil texture: This refers to the relative proportions of sand, silt, and clay particles in the soil. It determines important properties such as drainage and water retention.

2. Soil structure: This refers to the arrangement of soil particles into aggregates. Good soil structure allows for better infiltration, drainage, and root growth.

3. Soil pH: The pH value of the soil indicates its acidity or alkalinity. It affects the availability of nutrients to plants.

4. Organic matter content: Organic matter is vital for soil fertility and structure. It improves water retention and nutrient cycling.

5. Biological activity: Soil is teeming with microorganisms, such as bacteria, fungi, and earthworms, that play crucial roles in nutrient cycling and decomposition of organic matter.