ACCT 2220 Study Guide - Final Guide: Bulk Density, Ultimate Tensile Strength, Friability
14 Sep 2016
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Document Summary
Tilth refers to the physical condition of the soil in relation to plant growth. Depends not only on aggregate formation and stability but also on bulk density. A major aspect of tilth is soil friability. Soils are said to be friable if their clods are not sticky or hard, but rather crumble easily revealing their constituent aggregates. Enhanced when the tensile strength of individual aggregates is relatively high compared to the tensile strength of the clods. Allows tillage forces to easily break down the large clods while resulting aggregates remain stable. Increased soil organic matter content usually enhances soil friability and can partially alleviate the susceptibility of a clay soil to structural damage during tillage and traffic. Bulk density is defined as the mass per unit volume of the soil as it exists in place (weight of the dry soil divided by the volume of the sample. Values for soils commonly range from 1. 0 to 1. 75 mg/m3 (g/cm3).
