Soil pH or soil reaction is an indication of the acidity or alkalinity of soil and is measured in pH units. Soil pH is defined as the negative logarithm of the hydrogen ion concentration. The pH scale ...

University of Minnesota Extension Information collected from a soil test can be no better than the sample. Therefore, proper collection of the soil sample is extremely important. Representative ...

Global map of soil moisture regimes. Developed by USDA-NRCS, Soil Survey Division, World Soil Resources, Washington, DC.