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2.04.9(1)(d) (d) Suitability for Plant Growth. The major component of the soil is Pachic Haploboroll (Chernozemic P.egosol), a coarse, loamy, mixed mesic (IIreece Series). The soils are immature, having no genetic soil horizonation other than a darkened surface horizon (A horizon). Soil structure is weak and relatively unstable. However, their moderately coarse textures (sand loams) insure good permeability and aeration to these soils or the materials derive3 from them without additional aggregation. Consequently, the soils of this group can be disturbed, transported, and relocated for new seedbeds without serious loss of good physical condition. The soils of this group are subject to some packing if continuously traversed by heavy machinery, and form a structureless mass if handled near saturation. These conditions can be corrected with conventional tillage. All physical qualitites indicate that these • soils are good sources of seedbed material; however, their water tables present severe problems to their accessability. The soils have very low shrink/swell ratios. Total potential extensibility ranges from 0 to 0.8 inch for a 40-inch section. Pao evidence of mass movement is noted and the potential for such movement is negligible. (e) Productivity These soils are immaturely developed, having no genetic horizonation other than darkened surface horizons (A horizons). Normally they lack horizons of secondary carbonate accumulation. The control section (10 to 40 inches) is neutral to mildly alkaline while the C horizon is neutral to moderately alkaline and, while normally noncalcareous, may contain some free carbonate in a few localities. • Under such conditions the cation exchange complex (portion of the soil having an ability to hold and exchange cations) is normally base saturated with calcium being the predominant cation, but there 5-74