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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />002258 <br /> <br />based economy, and its future under expected less favorable water <br /> <br />supply conditions. While the land is almost uniformly flat on the <br /> <br />Llana Estacado. there are subtle differences in soil conditions <br /> <br />which make for distinct differences in cropping patterns and water <br />requirements. These. in turn, contribute to significant differ- <br />ences within the nine-county grouping between roughly and approxi- <br /> <br />mately the northern and southern halves of the area, differences <br /> <br />which are important to the assessment, In subsequent sections, <br /> <br />these differences are frequently highlighted by comparisons of <br />county and local data. <br /> <br />At some risk of over-generalizing from the soil scientists <br /> <br />point of view. the basic soils of the area are here characterized <br /> <br />in three groups as follows:* <br />(B) -- hard or "tight" lands, generally classified as <br /> <br />Pullman silty clay loams. predominantly deep, fine- <br /> <br />textured, slowly permeable soils consisting of six <br /> <br />to 12 inches of clays or clay loam over heavy clay <br />sub-soils, these soils absorb water slowly but have <br />a high water-holding capacity usually capable of <br /> <br />storing or retaining over two inches of available water <br /> <br />per foot of soil depth. <br />(el -- mixed or "catclaw" lands, generally classified as <br /> <br />Amarillo or Portales fine sandy loarns, predominantly <br /> <br />*Texas Agri cultura 1 Experiment Stati on, "Requi rements for Grain <br />Sorghum Irrigation on the High Plains," Bulletin 846 (January <br />1957) Soil type A is not found in this nine-county area. <br /> <br />IV-17 <br /> <br />Arthur D Little.lnc <br />