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000182 . CHAPTER III ARABLE LANDS predominantly deep, sandy loams and loamy sands and have good permea- bility, restricted available moisture capacity, and low saline-sodic content. With sufficient irrigation water and fertilizers they are mod- erately or highly productive. The long growing season is favorable to the production of a wide range of diversified crops. The Wilson and South Mesa lands lie high above the valley on the west slope of the La Sal Mountains. Mesa soils are medium to fine textured, high in organic matter, and are almost free of salt and alkali. The short growing sea- son on the mesas restricts crops to alfalfa, small grains, pasture, and other livestock feeds. The deep, permeable valley soils have a high irrigation water re- quirement. Much 'of any new irrigation water applied to the land would seep into the gravel substrata and move down the valley toward the Colo- rado Eiver. At locations where the ground water movement would be im- peded, waterlogging would result, creating a major requirement for drainage. This situation would be likely to occur in the lower reaches of Spanish Valley and in Moab Valley. Drainage conditions on mesa lands have not been appraised. Lisbon Valley ftrea . Included in the Lisbon Valley Area are lands (1) in Lisbon and Big Indian Valleys, (2) on the southern foot slopes of the La Sal Mountains near La Sal and Old La Sal, Utah, and (3) on Wray, Middle, and Island Mesas. The valleys include about 4,700 acres of arable land and the re- mainder of the area, about 26,400 acres, is on the foot slopes and mesas. Land elevations range from 6,000 to 7,500 feet. Valley lands have deep alluvial soils derived from sandstone and some shale materials. The soils, located mostly on moderately sloping fans, are coarse to medium textured and are low in salt and alkali. other lands of the area have medium-textured soils that are underlain at moderate depths by sandstone or occasionally by cobble on the lower slopes of the La Sal Mountains. Arable lands of the area would have a moderate to low drainage requirement under full irrigation. Dry Valley Ju'ea . The Dry Valley Area is located west of the Lisbon Valley Area. Elevations range from 5,500 to 6,500 feet. Soils are moderately shallow over massive, crossbedded Jurassic sandstone, which is exposed in many places. On alluvial fans the soils are mostly coarse textured, and on narrow flood plains of Hatch and East Canyon washes soils are medium to fine textured. The lands are quite free of salt and alkali except for accumulations along these washes. The undulating surface has reculted partly from wind action. Most of the arable lands would require 27