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SOIL SURVE 54 tour plowing and striperopping is often difficult on the irregular slopes of this soil. Crops grown on this soil respond well to irrigation although it may erode the steeper areas. This soil has fair suitability for pasture or hay. Using it for hay or pasture reduces erosion. Droughtiness re- duces growth during the summer months, at which time supplemental pasture may be needed. Proper stocking, rotation grazing, and weed control help to keep the pas- ture and may be desll in irableood to improve a plant spec es and potential ure and yield. This soil has fair suitability for trees (fig. 9). Seedling mortality is generally low but depends mainly on availa- bie moisture. Competing vegetation can be controlled by spraying, cutting, or girdling. Erosion can be controlled by mulching during planting or by keeping a protective vegetative cover on the soil. Equipment use is generally not restricted in kind or time of year. This. soil is well suited to building site development. It is moderately susceptible to frost heave. Roads, streets, and sidewalks are subject to frost damage unless care- fully designed. Sidewalls in the underlying material have poor stability and may cave in during excavation for foundations or installation of underground utilities. This can be prevented by temporary retaining walls. Septic tank absorption fields function well in this soil. There is a possibility, however, that they may pollute underground water supplies and nearby lak A ar streams unless specially designed. Lawns, tre� ar shrubs are generally easy to establish and maintain. Th soil is a good source of sand and gravel for construcuc This soil is in capability subclass the and woodlar suitability group 2o. 325—Prebish loam. This is a level, slightly conceiv very poorly drained soil. It is in shallow depressions c the margins of large depressions occupied by orgar soils and on ground moraines. Delineations are 5 to . acre and are irregular in shape. This soil is subject flooding by runoff from adjacent more sloping area Typically, the surface layer is black loam about inches thick. The subsoil is about 31 inches thick. T. upper part is gray, mottled loam. The middle part is oli gray, mottled loam. The lower part is variegated da brown, reddish brown, and dark gray coarse sandy loa The underlying material is reddish brown sandy loam. some areas the surface mantle has up to 15 inches silty material. Included with this soil in mapping are small areas Ronneby, Auburndale, and Cathro soils. The Ronne soils are somewhat poorly drained and occupy positic alrehtly poorllylope m drained. They om shaves a thick Auburndale silty surta mantle and occupy depressionat areas. The Cathro sc Figure g.—Christmas trees on Rosholt sandy loam, 6 to 15 percent slopes. Gale soils are on the steep slopes in me