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<br />r~ <br />Section 780.18(b) Continued. <br />Rule 4.15 <br />of these factors will have on soil erosion caused by wind. B.W. Greb <br />1979 reducing Drought Effects on Croplands in the West-Central Great <br />Plains. USDA Agricultural Information Bulletin No. 420, p. 31 <br />summarizes the factors influencing wind erosion on croplands in the <br />Great Plains and reported that "soil is most susceptible to erosion <br />during the dormant season after wheat has been planted not during the <br />fallow season itself." The reports that "the peak danger period is <br />from February 10 to April 20 when small soil aggregates have been <br />pulverized by alternate freezing and thawing and windstorm <br />probabilities are high." Greb reports that, "Erosion by wind can be <br />controlled by any or all four principles of control, namely: (I) <br />Produce or bring to the soil surface aggregates or hard clods large <br />enough (~- to 3-inch diameter) to resist wind force; (2) roughen the <br />land surface to reduce wind-speed impact by implement furrows; (3) <br />reduce field width by strip cropping or by establishing vegetative <br />barriers, thereby reducing wind speed and soil avalanching; and, most <br />importantly, 94) establish and maintain vegetative cover in excess of <br />1,200 lb/acre o protect the (Soil." <br />In an effort to accommodate these factors and considerations, Kerr <br />Coal will take advantage of the following practices and conditions to <br />control wind erosion post-topsoiling and pre-germination. First, <br />topsoil will normally be reapplied only during growing seasons in an <br />effort to assure that germination will occur as quickly as possible. <br />Secondly, the topsoil will be reapplied in a roughened configuration <br />and with furrows created by scrapers in the reapplication process. <br />Finally, the natural crusting which will occur as water evaporates <br />from the surface of the reapplied topsoil will act as a significant <br />retardant to wind erosion. <br />~. <br />The use of these techniques to control erosion is corroborated by <br />N.P. Woodruff, L. Lyles, F.H. Siddoway and D.W. Fryrear 1972 <br />780-73cccR <br />Revised - August, 1990 <br />___a_~_ <br />