AGRO 2051 : Test 1 Review Answers
Document Summary
Soil consists of 2 general solids and 2 general fluids minerals and organic matter, and soil solution and air, respectively: define regolith and solum. Regolith is all unconsolidated (porous) material lying above rock. Except for the uppermost part, the regolith is geologic material. Along the sequence, red to gray, the soil environment is increasingly wetter and more poorly aerated (oxygenated). Very poor drainage and aeration as suggested by the presence of chemically reduced iron: define sand, silt and clay according to the usda classification system. Texture is quantitatively measured in the laboratory by a type of mechanical analysis, either pipette (as in lab exercise 1 or hydrometer). It can also be estimated to a fairly high degree of accuracy (by one experienced in this) simply by the feel of the soil: explain what is meant by dispersion and flocculation of soil colloids.
