Soil pH describes acidity or alkalinity, also provides information on nutrient availability, metal dissolution chemistry, and the activity of microorganisms. Predominantly, soil pH is measured in soil–water extraction, and extraction differs in soil/water ratio. The objective of this study was to compare the pH results of three different measurements that have 1:1, 1:2.5, and 1:5 soil/water extraction ratios. The results were interpreted in 3 major natural zones. In the steppe, there was almost no difference in the 3 measurements. In the gobi, a difference occurred in samples that have a pH value between 7.5 to 8.5. However, there was no change in values other than these. In the khangai, when the soil/water ratio was 1:2.5 and 1:5, the pH value had no significant difference. The 1:1 version was slightly lower values than the other 2 measurements. The differences of pH values measured in the 3 extractions in all natural zones were not high to change the classification.
