PROF1 RATE = Soil Profile 1
PROF2 RATE = Soil Profile 2
"PROF1 RATE" is the first soil profile for the first soil association. Soil profile ratings are usually based on a measurement of the depth of soil development, but some soil profile ratings are based on structural characteristics of the soil profile rather than its depth.


The soil profile is the environment in which the crops' roots grow. Profile ratings are based on the depth, structure, texture and chemical make-up of the soil. The highest ratings (maximum of 20-points) are given to those soil profiles in which the soil has developed to a depth of 12 inches or more; the soil has good structure (not hard or blocky); the soil has favourable texture (is not gravely or sandy); and the soil is not full of calcium carbonates or sodium.

Lighter textured soils have mainly large, continuous pores that transmit water very quickly. Rainwater quickly moves down through a sandy soil. A profile adjustment factor has been introduced to decrease the profile rating assigned to lighter textured soils. The profile adjustment factor is based on the moisture holding capacity of the soil texture that makes up the soil profile. It applies only to soils of texture lighter than a loam. The lighter the soil texture, the lower the profile adjustment factor and, therefore, the lower the profile rating will be. Since the soil texture in this example is clay loam to loam, no profile adjustment factor is warranted.

In this example the soil profile is developed to a depth of eight inches and is calcareous (has calcium carbonate in the profile). The soil profile is a CAL8, which is rated at 10-points. This profile rating has not been reduced by a profile adjustment factor because this Weyburn soil has a texture greater than Loam texture (profile adjustment factors, if present, are not shown on the detail profile).

On this particular sample profile there is not a second different soil association, but rather, the second soil association is Weyburn. When there is a second soil profile rating, or second topsoil rating, the soil association has to be entered again as the second soil association. Sometimes there are two different soil associations with two organic matter ratings, four texture ratings, two profile ratings and two topsoil ratings. In these instances, the organic matter ratings, profile ratings, texture ratings, and topsoil ratings are each added together and averaged.

On this sample detailed profile there are two soil profiles for soil association 1. The second soil profile (PROF2 RATE) is usually the soil profile that is rated in the soil area. In this particular example, the soil profile is OR10. The soil development is to a depth of 10 inches and the profile rating is 18 points. The average profile rating is then 14 points  (18 +10) ÷ 2.

If more information is required on soil profile ratings, the reader should consult The Canadian System of Soil Classification.

Abbreviations:

BGL = Gray wooded soils that have a sandy subsoil profile, type 1
BRUN = Gray wooded soils that have a sandy subsoil profile, type 2
CAL8 = Soil containing calcium carbonate 7 to 9 inches below the surface
CAL10 = Soil containing calcium carbonate 9 to 12 inches below the surface
CAL12 = Soil containing calcium carbonate more than 12 inches below the surface
CR = Undeveloped soil type: various layers of soil buried by sand
DG8 = Dark Gray soil 8 inches below the surface
DG10 = Dark Gray soil 10 inches below the surface
DG12 = Dark Gray soil 12 inches below the surface
DGL = Dark Gray wooded soils1
DGM/AE = Dark Gray wooded soils2
E-M = Moderately leached soil
ER = Undeveloped soil type: eroded profiles
E-SL = Slightly leached soil
GLEY = Poorly drained soil - type 1
GW = Gray wooded soils
HG = Poorly drained soil - type 2
HLG = Poorly drained soil - type 3
MC-M = Massive clay moderate
MC-STR = Massive clay strong
OGL = Severe Gray wooded soils
OLG = Poorly drained soil - type 4, white soil in pot holes
OR = Undeveloped soil type: less than 2 inches of subsoil
OR8 = Normal soil profile for 8 inches below surface
OR10 = Normal soil profile for 10 inches below surface
OR12 = Normal soil profile for 12 inches below surface
REGO = Heavy clay soils
RS = Undeveloped soil type: immature (no subsoil)
SG = Single grain sand
SOL-M = Moderate breakdown of the hard pan
SOL-SL = Slight breakdown of the hard pan
SOL-Z = Hard pan is more than 5 inches from the soil surface
SOL-Z+ = Hard pan is less than 5 inches from the soil surface
Z = Strongly salt affected soil
Z-M = Moderately salt affected soil
Z-SA = Severely salt affected soil
Z-SL = Slightly salt affected soil
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