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• <br />• <br />,. <br />The major herbicide used is a formulation containing 2,4-D, and is applied late <br />in the spring. Cultivating is seldom used for weed control. <br />As discussed in Section 2.5, wheat tillage practices consist of, but are no[ <br />limited to, discing, seeding, aerial application of herbicides for weed control, <br />harvesting, fallowing every other year, and deep plowing approximately every <br />third year prior to seeding. <br />Farming areas are also more susceptible to erosion and soil Loss because of a <br />lack of a permanent vegetative cover, fallow practices, and a general lack of <br />contour farming. <br />3.6.2.1 Regraded Spoils Preparation <br />On areas being reclaimed to cropland, a drag is pulled over the regraded spoils <br />to provide a smooth surface to replace topsoil on and to promote a uniform depth <br />of topsoil replaced. Alternatively, this final leveling may be achieved with a <br />motor grader or similarly effective piece of equipment. If rucks are present <br />that would interfere with topoil replacement and tillage, they are removed. <br />3.6.2.2 Topsoil Replacement <br />Trapper Mine replaces the equivalent of approximately 18 inches of undisturbed <br />topsoil on regraded lands that are being returned to cropland. This depth will <br />allow plowing to 12"-16" as is commonly done in the area every second or third <br />year. A comparison of inbank and replaced topsoils a[ Trapper Mine has shown an <br />approximately equal topsoil density for both areas. Thus, the desired replace- <br />ment depth need nut be adjusted to account for swell or compaction of the re- <br />placed soil. Under normal circumstances, topsoil replacement is done during the <br />summer and early fall. <br />3-70 <br />REVISED FEB 13 'B7 <br />