FANR 3060 1st Edition Lecture 8 Outline of Last LectureI. The 4 processes (con’t)II. Soil ClassificationIII. Diagnostic Horizons Outline of Current LectureI. Diagnostic Horizons (con’t)II. Soil OrdersChapter 3I. Diagnostic Horizons (con’t)a. Disgnostic B horizonsi. Cambic1. Blocky,low in clay2. Bw horizonsii. Argillic1. High in clay2. Bt horizonsiii. Spodic1. Black in color2. Illuvial humusThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.3. Bh horizonsiv. Oxic1. High in clay and iron, very deep2. None found in continental USa. Only in the tropicsII. Soil Ordersa. Entisolsi. “young” soilsii. No B horizon of any kindiii. The A horizon MUST be ochric or umbriciv. Found on floodplains (fresh parent material), steep slopes, and young landscapes, or older landscapes where translocation hasn’t occuredb. Inceptisolsi. Show some signs of translocationii. Have an ochric or umbric Aiii. Cambic Bw horizon1. Just starting to form2. Blocky structure, some illuvial iron3. Minimal (or no) clay movement has occurrediv. Found on terraces and older floodplainsc. Spodosolsi. Ochric or umbric A horizii. Bh subsoil1. Spodic2. Contains bands of illuvial humusa. Black/dark grayiii. Below A horiz is very white E horiz1. Albic (white)iv. Only form on sandy parent material with coniferous native vegetation1. Tannin vegetation2. Flat topographyv. O horiz is very acidic1. Creates albic and spodic horiz by leaching humus and iron out of Aand E horiz and into the Bhd. Mollisolsi. Mollic A horizii. Subsoil could be anything1. C2. Some type of Biii. Associated with prarie grass vegetation1. Large annual input of plant materialiv. Found on Great Plains in Midwest Statesv. Usually on glacial parent material1. Glacial tillvi. Also found on sedimentary residuumvii. Have a lot of bases and very acids1. Basic soilviii. High carbon input from high humus levelse. Alfisolsi. Ochric or umbric A horizii. Argillic Bt horiz1. Relatively high in basesa. Ca and Mg2. pH is neutral or alkalineiii. “mature” soils with illuvial clayiv. Occur primarily in hardwood vegetation and on top of glacial tillf. Ultisolsi. Rely on 2 of the 5 factors to form1. Time (old) and climate (hot and wet)2. Old, highly weathered soilsii. Ochric or umbric A horiz1. Low humus levelsiii. Argillic Bt horiz1. Low in bases (high in acids) a. Due to extreme leaching2. Very deep3. High in clayiv. Most of GA has this type of