Which of the following is NOT a term which describes the pH of soil?

In the context of soil pH, the terms alkaline, acidic, and neutral are commonly used to describe the level of acidity or basicity of the soil. Alkaline soils have a pH greater than 7, indicating the presence of more basic substances. Acidic soils have a pH less than 7, indicating higher acid content. Neutral soils have a pH of around 7, meaning they are neither acidic nor alkaline.

On the other hand, "active" is not a term used to describe the pH of soil. While it may relate to other properties of soil, such as biological activity or nutrient availability, it does not pertain to the pH scale, which primarily categorizes soil into acidic, neutral, or alkaline categories. Understanding these distinctions can help in interpreting soil characteristics and their implications for agriculture, plant selection, and soil management strategies.