Soil texture, interpreting

Table 1.2 Interpreting Soil Texture from Behavior of a Moist Bolus (Ball)... 

Uniformity in this context refers to slope and texture. Ideally, the field should have a slope of less than 2%, and if possible, there should be only one soil series on the field. If more than one soil series is on the field, all the series should be of the same texture, i.e., all should be sandy loams. This criterion does not preclude the possibility of layered soils (soils with distinct horizons) as long as the entire field is characterized by this layered soil. The more uniform the field, the easier will be the interpretation of results. Soil Conservation Service soil surveys give sufficiently detailed information to characterize a field. 

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