PERMFILE129975 - Laserfiche WebLink

Home Browse Search

• FINE-LOAMY - by weight, a textural class in which the fine earth fraction has 1R to 34 percent clay and greater than 15 percent fine or coarser sand. HORIZON (SOIL) - contrasting layers of soil material approximately parallel to the land surface and differing from adjacent layers in physical, chemical, and biological properties of characteristics. A HORIZON - commonly the uppermost mineral layer in the soil profile often referred to as the surface soil, It is the horizon where humus is accumulative or formed and also called the zone of eluviation, E HORIZON - a mineral layer in which the dominant feature is loss of silicate clay, iron, aluminum or some combination of these, leaving a concentration of sand and silt particles of quartz or other resistant minerals. B HORIZON - the master horizon commonly found immediately beneath the A horizon and often called the subsoil or zone of illuviation. • C HORIZON - a mineral like layer, excluding bedrock or unconsolidated lithol ogic materials, that is only slightly affected by pedogenic processes and lacks properties diagnostic of A and B horizons. It is often called the substratum. R HORIZON - hard bedrock; cononly sandstone within the study area. FRIGID - a soil temperature regime with mean annual soil temperature less than 8 degrees Centigrade (47 degrees Fahrenheit) at a depth of 20 inches or at a lith is or paralithic contact, whichever is shallower. The difference between mean summer and mean winter soil temperature is more than 5 degrees Centigrade (9 degrees Fahrenheit). Frigid is implied in all boric suborders and cryic great groups, and is redundant if used in the name of a family. MODERATELY DEEP - the soil is 20 to 40 inches deep over bedrock. MOTTLING, SOIL - irregular spots of different colors that vary in number and size. • Mottling generally indicates poor aeration and impeded drainage. 9-6-28 Revised 05/16/88