AS1 = Soil Association 1 or
AS2 = Soil Association 2
The soil associations for the area of land that is being rated. Soil associations are natural groupings of soil associates based on similarities of climatic factors (same soil zone), similarities of geologic deposit, and that are affected by similar soil forming processes. In this example the first soil association (AS1) is WR (Weyburn). It has a climate rating of 21 and an organic matter rating of three. These two numbers are found directly beneath the WR on the profile. The second association is also Weyburn.
C = Climate Rating
The climate rating is based on a climate study completed for SAMA by the Department of Geography, University of Regina. In the study, titled "Evaluation and Mapping of the Climatic Factor in Rural Land Assessment in Saskatchewan, Using a Geographic Information System", Saskatchewan's rural municipalities were ranked based on their suitability for wheat production. Climate ratings are a maximum of 32 points.
OM = Organic Matter
The organic matter rating is based on a study of soil samples conducted from across Saskatchewan. Sampling done by the Saskatchewan Centre for Soil Research (University of Saskatchewan) has shown that the organic matter content of Saskatchewan soils varies from no organic matter on some sandy soils, to a high of 7.5% for Melfort Soils. (The organic matter content is highest in the Black soil zone in northern and eastern areas of the province, and is the lowest in the Brown soil zone in the South Western part of the province.) An organic matter rating table was developed by assigning 0 index points to soils with less than 2.5% organic matter, and a maximum of 13 index points to the soil with the most organic matter (7.5%). (For example, a soil with 5.1% organic matter receives an organic matter rating of 5.1 ÷ 7.5 x 13 = 9 points). Organic matter is a maximum of 13 points.