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Erosion Runoff Study cont. <br />Page 3 <br />1) Treatment 1: Winter wheat/stubble mulch = <br />36 x .32 x 13 x .15 x .9 = 20.2 tons/ac/yr. <br />2) Treatment 2: Winter wheat/stubble mulch/land imprinting = <br />36 x .32 x 13 x .10 x .9 = 13.5 tons/ac/yr. <br />3) Treatment 3: Perennial seeding/straw mulch/land imprinting = <br />36 x .32 x 13 x .15 x .9 = 20.2 tons/ac/yr. <br />4) Treatment 4: Perennial seeding/land imprinting = <br />36 x .32 x 13 x .47 x .9 = 63.3 tons/ac/yr. <br />Soil lost in tons/ac/yr Following three years of vegetation establishment <br />(1983 cover estimate) on: <br />1) Treatment 1: Winter wheat/stubble mulch = <br />36 x .32 x 13 x .0582 x 1 = 8.7 tons/ac/yr. <br />' 2) Treatment 2: Winter wheat/stubble mulch/land imprinting = <br />36 x .32 x 13 x .0803 x 1 = 12.0 tons/ac/yr. <br />3) Treatment 3: Perennial seeding/straw mulch = <br />36 x .32 x 13 xz .0803 x 1 = 3.5 tons/ac/yr. <br />4) Treatment 4: Perennial seeding/land imprinting = <br />36 x .32 x 13 x .0281 x 1 = 4.2 tons/ac/yr. <br />Soil lost in tons/ac/yr on adjacent rangeland pre-mine sites: <br />36 x .32 x 13 x .0335 x 1 = 5.0 tons/ac/yr. <br />4.0 The resulting data substantiate the effectiveness of a variety of conser- <br />vation practices, particularly contour farming and mulching to reduce the <br />~ immediate erodibility of soils on disturbed lands. Over a relatively <br />short period of time, additional benefits in reducing soil loss can be <br />accomplished with the establishment of permanent perennial vegetation. <br />The amount of soil saved on [he various treatments is very substantial <br />i <br />j cont. <br />