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,, <br />was high the spring of seeding. Other species which are present an <br />this site include cheatgrass, mullein, tumblemustard, yarrow, big <br />sage, Louisiana sage, sweetclover, lambs quarter, leafy spurge, <br />Canada thistle, and smooth brome. Score of these species are <br />"weedy," but none of them are present in significant numbers to pose <br />a problem. Success of the seeding can be attributed to an early <br />spring seeding with abundant moisture immediately after seeding. <br />Mulching also enhanced favorable moisture relationships. Presently, <br />the mulch material is well decomposed and the plastic netting is <br />almost gone. <br />Recommendations <br />Additional fertilization in the form of spring applied nitro- <br />gen will enhance development of the grass stand. Supplemental <br />nitrogen is necessary to compensate for the nitrogen tied up in the <br />breakdown of the mulch material. <br />SedLnent Pmds <br />Physical Characteristics <br />These ponds are located across the highway from the Rienau /f2 <br />mine. The ponds were constructed in the spring of 1979 but they <br />were not reseeded until October of that year. When these ponds were <br />constructed they were not retopsoiled; thus, a clayey subsoil is the <br />plant growth medium. This compacted clayey subsoil was used to <br />achieve the impermeability necessary for the construction of the <br />ponds, which will function for the life of the mine. <br />Implementation <br />Seedbed preparation consisted of rototilling (Photograph 71. <br />This also facilitated the incorporation of fertilizer (diammonium <br />phosphate, 300 lbs/acre!. The seed was hand broadcast with a <br />cyclone seeder at the following rate: <br />S ecies Rate in lbs/acre <br />Slender Wheatgrass 20 <br />Western Wheatgrass 20 <br />Bluebunch Wheatgrass 15 <br />Basin Wildrye 5 <br />Sherman Big Bluegrass 5 <br />Indian Ricegrass 2 <br />Green Needlegrass 2 <br />