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<br />0: <br />c <br />(' <br />~. <br /> <br />c, <br /> <br />LAND .AND SOILS <br /> <br />The irrigated and arable non-irrigated lands on La Plata <br /> <br />River were mapped and the non-irrigated lands classified by <br /> <br />forces of the Bureau of Reclamation in 1933. <br /> <br />Three general classes of land were used, vis: <br /> <br />IRRIGATED LAND. All land which has been irrigated, <br />even though the supply may have been inadequate for <br />a large part of the time, is classed as irrigated, <br />without regard to its quality. In some cases irri- <br />gated meadow or pasture is so designated in con- <br />trast to other irrigated land. <br /> <br />:~~~:~il <br />. '4.;J <br /> <br />ARABLE LAND. Undeveloped land under existing irri- <br />gation systems, or possible extensions of such sys- <br />tems, or land for which water supply might be made <br />available has been classified according to its in- <br />herent qualities and the physical conditions that <br />affect cultivation. The classification deals only <br />with the facts of a physical nature and no attempt <br />is made to evaluate economic factors of development <br />(Classes 1 and 2) <br /> <br />NON-ARABLE LAND. Areas were placed in this class <br />because of being too high, isolated, or scattered <br />for water delivery, or for failure to meet the <br />standards for the arable classes in either soils, <br />topography, or drainage, or combinations of such de- <br />ficiencies, including mainly, areas of thin soil <br />overlying shale or sandstone in place; .heavy-textured <br />bottom lands high in alkali, rough steep breaks; sand <br />dune areas; arid river bottom lands below high water <br />level. (Class 6). <br /> <br />... <br /> <br />, <br />" <br /> <br />8 <br />