Organic deposits accumulate in stagnant water where decomposition of plant residues is retarded by the limited supply of carbon dioxide. A clay loam will require more frequent irrigation than will a sandy loam. The smaller the size of soil particles per unit weight, 45. Correct answers are in red . When more than one answer is acceptable, the additional correct answers are in blue .
Structure refers to the arrangement of soil particles or aggregates.
Electrical conductivity is a useful measure of salinity . The two sources of negative charge in clay minerals are ionic substitution and exposed crystal edges or broken clay edges . The two methods for the determination of soil texture are by feel or feel method and lab analysis or particle size analysis . In aluminosilicate clays, layers are composed of sheets , which in turn are composed of the two basic structures that serve as building blocks for aluminosilicate clays.