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• <br /> SOILS DESCRIPTION <br /> ADAMS COUNTY, COLORADO <br /> • LOAMY ALLUVIAL LAND , GRAVELLY SUBSTRATUM (Lv) occurs as small areas in <br /> major drainageways. It is a principal source of gravel . Nearly all <br /> areas are subject to flooding from streams , and the floods often are <br /> damaging. <br /> The soils are shallow and stratified. The strata are of <br /> ' • moderately coarse textured to moderately fine textured material that <br /> is underlain by river sand and gravel . In some places the soils are <br /> slightly influenced by soluble salts. <br /> The soils of this land type absorb water at a rapid to slow rate. <br /> The available water capacity is Low, but many areas have a high water <br /> table that is beneficial to plant growth. <br /> Much of this land type is cultivated and irrigated. The <br /> principal crops are truck crops adapted to the area , mainly celery, <br /> melons , sweet corn , tomatoes , lettuce , carrots , onions , and cabbage. <br /> The best growing conditions can be maintained if the normal water <br /> table is controlled so that it remains at a depth of 10 to 20 inches <br /> below the surface during the growing season. Other irrigated crops <br /> • include pasture mixtures that require some irrigation but are partly <br /> sustained by the water table in the gravel layers. <br /> Some of this land type is in native grass , mainly western <br /> wheatgrass , saltgrass , blue grams , and switchgrass. The wetter areas <br /> produce sedges , rushes , and cattails. This vegetation is largely <br /> sustained by the natural water table and by flooding. Little <br /> • irrigation is needed. Capability unit IVw-1 , irrigated; not placed in <br /> a range site; tree planting suitability group 5. <br /> • <br /> • <br /> • SOIL SURVEY OF ADAMS COUNTY, COLORADO; USDA, Soil Conservation Service <br /> in cooperation with Colorado Agricultural Experiment Station , <br /> October , 1974. <br /> • <br />