What is considered a neutral soil pH?

A neutral soil pH is defined as a pH level of 7.0. This value indicates a balance between acidity and alkalinity, with neither component dominating. In soil science, pH levels below 7 indicate acidity (with lower numbers representing stronger acidity), while levels above 7 indicate alkalinity (with higher numbers representing stronger alkalinity).

A pH of 7.0 is significant because it is the point where the concentration of hydrogen ions equals that of hydroxide ions, resulting in neutral conditions. This is essential for the optimal availability of nutrients to plants and microorganisms in the soil, making it an ideal range for many agricultural practices.

Other options show either an acidic or alkaline condition. A pH of 5.0 is considered acidic, which can limit the availability of certain nutrients. A pH of 6.5, while still slightly acidic, is closer to neutral but does not qualify as neutral. A pH of 8.0 is considered alkaline, which may lead to nutrient deficiencies as well. Therefore, identifying a pH of 7.0 as neutral provides a foundational benchmark in soil studies, supporting healthy plant growth and ensuring nutrient balance.