What does soil pH indicate?

Soil pH is a crucial measurement that indicates the acidity or alkalinity of the soil. It is measured on a scale ranging from 0 to 14, where a pH of 7 is considered neutral. A pH lower than 7 indicates acidity, while a pH higher than 7 indicates alkalinity. This measurement influences the availability of nutrients to plants, as certain nutrients become more or less available depending on the pH level. For instance, many nutrients are more readily available at a slightly acidic pH, which is why understanding soil pH is essential for effective plant growth and agricultural practices.

The other options pertain to different soil characteristics. While the type of minerals in the soil can influence pH, it does not directly indicate pH itself. Water saturation involves the moisture content of the soil, which is unrelated to pH levels. Organic matter plays a role in soil health and fertility but does not reflect the soil's acidity or alkalinity. Thus, understanding soil pH is vital for plant care, as it directly affects nutrient availability and overall soil health.