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Custom Soil Resource Report <br />Soil Properties and Qualities <br />The Soil Properties and Qualities section includes various soil properties and qualities <br />displayed as thematic maps with a summary table forthe soil map units in the selected <br />area of interest. A single value or rating for each map unit is generated by aggregating <br />the interpretive ratings of individual map unit components. This aggregation process <br />is defined for each property or quality. <br />Soil Physical Properties <br />Soil Physical Properties are measured or inferred from direct observations in the field <br />or laboratory. Examples of soil physical properties include percent clay, organic <br />matter, saturated hydraulic conductivity, available water capacity, and bulk density. <br />Bulk Density, One -Third Bar <br />Bulk density, one -third bar, is the ovendry weight of the soil material less than 2 <br />millimeters in size per unit volume of soil at water tension of 1/3 bar, expressed in <br />grams per cubic centimeter. Bulk density data are used to compute linear extensibility, <br />shrink -swell potential, available water capacity, total pore space, and other soil <br />properties. The moist bulk density of a soil indicates the pore space available for water <br />and roots. Depending on soil texture, a bulk density of more than 1.4 can restrict water <br />storage and root penetration. Moist bulk density is influenced by texture, kind of clay, <br />content of organic matter, and soil structure. <br />For each soil layer, this attribute is actually recorded as three separate values in the <br />database. A low value and a high value indicate the range of this attribute for the soil <br />component. A 'representative" value indicates the expected value of this attribute for <br />the component. For this soil property, only the representative value is used. <br />23 <br />