B21h 5-13 Dark brown (7. SYR 3/2) fine sandy loam; moderate medium 

 granular structure; friable; very strongly acid; many roots; 5 

 percent coarse fragments; abrupt broken boundary; 



B22ir 13-20 Dark reddish brown (SYR 3/4) fine sandy loam; moderate 

 medium granular structure; friable; strongly acid; many roots; 

 S percent coarse fragments; clear wavy boundary. 



B23ir 20-41 Strong brown (7. SYR 516) gravelly fine sandy loam; moderate 

 medium granular structure; friable; strongly acid; roots are 

 common; 30 percent coarse fragments; clear wavy boundary. 



B24 41-53 Yellowish brown (lOYR 5/6) gravelly fine sandy loam; 

 moderate medium granular structure; friable; strongly acid; 

 roots are common; 25 percent coarse fragments; gradual wavy 

 boundary. 



B3 53-84 Yellowish brown (lOYR 5/4) gravelly sandy loam matrix with 



yellowish red (SYR 5/8) streaks and a few fine distinct light 

 brownish gray (2.SY 6/2) mottles; weak thick platy structure; 

 friable; strongly acid; few roots; 40 percent coarse fragments; 

 fabric includes lenses of fine and medium sand up to 2 inches 

 in thickness and in horizontal orientation; abrupt wavy 

 boundary. 



Cx 84-114 Light olive brown (2.5Y 5/4) gravelly fine sandy loam matrix 



with yellowish brown (lOYR 5/6) streaks; massive; firm; 

 medium acid; few roots; 25 percent coarse fragments; 

 weathered Conway granite fragments up to 4 inches in 

 diameter are common; silt caps on coarse fragments. 



Analytic methods 



Particle-size distribution was determined by a modification of the Steele and 

 Bradfield (1934) sedimentation method. Except as noted, amounts of chemical 

 constituents were determined by standard procedures as outlined in the Soil 

 Survey Laboratory Manual (Soil Survey Staff, 1972). The soil was extracted by 

 pH 7.0 NH40Ac. K, Na, Ca, and Mg in the extract were ascertained by Flame 

 Emission/Atomic Absorption Spectrophotometry, Exchangeable Bases by 

 ignition and titration of the extract (Chapman, 1965), and cation exchange 

 capacity by distillation of ammonia from the soil after having removed all excess 

 salts. Extractable acidity was assayed by extraction with pH 8.2 BaC12- 

 triethanolamine buffer and titration of the extract. Organic Carbon was obtained 

 by acid dichromate digestion and nitrogen by Kjeldahl analysis. Iron and 

 aluminum were assessed by both dithionite-citrate and sodium pyrophosphate 

 extraction, followed by Atomic Adsorption analysis. For the index of 

 accumulation, cation exchange capacity was taken as the sum of titratable 

 acidity and exchangeable bases. 



RESULTS AND DISCUSSION 



Spodic horizons are defined in Soil Taxonomy (Soil Survey Staff, 1975) as 

 either having a subhorizon continuously cemented with organic matter and iron 



