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<br />II <br /> <br />D t: :'. 3 ;~ 7 <br /> <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 />against erosion by water and the sandy soils against soil blowing". On the <br />irrigated lands in Lincoln County most crops are said to respond to nitrogen. <br />Further to the east, where the aquifer thickness is less, one encounters the <br />dissected plains. These plains soils were formed from a parent material of <br />loess and are generally in the Holdrege-Colby association. Some of this <br />association occurs in southern Lincoln County. Erosion by water, soil <br />blowing and drought are hazards in areas of cultivated soils. However, the <br />soils in these areas respond better to irrigation than those of the Valentine <br />Association and soil blowing appears to be less of a hazard. <br /> <br />Blown~out land develops where protective plant cover has been destroyed <br />by cattle trailing (i.e. all following a single path), livestock concentra- <br />tion, or cultivation, and is said to occur in larger areas of Valentine soil. <br />Soil blow-out spreads by undercutting plants, destroying them by sand- <br />blasting, or burying them. Characteristic is a bowl-like depression and <br />an adjacent overblown area. The soil series descriptions indicate little <br />topsoil development, with all soil series in Grant and Arthur counties being <br />coarse textured, subject to wind blowing or having a seasonal high water <br />table. The picture which develops is one of ample water in the Ogallala <br />but limited area suitable for irrigated cultivation in this abundant water <br />area. <br /> <br />The Buffalo County soils survey was selected for review as the county is <br />east of the Sandhills. There are two soils series which occupy fairly large <br />areas; Colby silt loam (11.2%) and Colby, Uly, and Hobbs soils (11.0%). <br />However, these soils occur on relatively steep slopes. Because the flatter <br />soils were evenly distributed through a large number of series descriptions <br />with less than 10% area in each, only a general statement is appropriate; <br />soil blowing and water erosion are both noted problems. <br /> <br />Kansas <br /> <br />Soil s in western Kansas are generally of high permeabil ity. In the <br />western most portion of the State are the aridic soils which are deep, grayish <br />brown and dark grayi sh-brown sil t loams with a depth to the secondary car- <br />bonates of less than 36 inches. In the more southern area, along the <br /> <br />1~3 <br />