Which of the following is NOT a soil property from the given list?

Soil pH is a critical property of soil, as it indicates the acidity or alkalinity of the soil and plays a significant role in nutrient availability for plants. However, in the context of defining fundamental soil properties, pH is generally considered a chemical property rather than a physical or structural property.

On the other hand, soil texture refers to the proportion of different particle sizes (sand, silt, and clay), which affects water retention and root penetration. Soil density considers the mass of soil per unit volume and influences porosity and compaction. Soil depth pertains to the thickness of the soil layer above bedrock and can greatly impact plant growth and drainage.

Therefore, while pH is essential for understanding soil health and fertility, it is categorized differently from the physical characteristics such as texture, density, and depth. This distinction is why soil pH is not classified in the same realm of properties as the others listed.