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10 <br /> A series of indoor tests was made in which Ranger alfalfa, crested wheat- <br /> grass, yellow sweet clover, rabbit brush, sagebrush, and Marglobe tomatoes <br /> were planted in leached and unleached Kennecott Utah tailings which had been <br /> treated with several chemical soil stabilizers. The group planted in tailings <br /> which had been leached to remove soluble salts included a control and four <br /> plots treated with Coherex (a resinous adhesive) , Peneprime (a bituminous base <br /> product) , Soil Gard (an elastomeric emulsion) , .and Compound SP-400 (organic <br /> long-chain polymer). In this series, Coherex and Soil Gard stimulated germi- <br /> nation and sustained plant growth, whereas Peneprime and Compound SP-400 <br /> hindered germination in comparison with the control plot. The second series <br /> of tests encompassed plantings in unleached tailings treated with only Soil <br /> Gard and Coherex and compared with a control. On leached tailings, the <br /> effects of Coherex and Soil Gard were more nearly the same; on unleached tail- <br /> ings, Coherex performed better. The respective germination and survival rates <br /> were as follows, .in percent ; <br /> Coherex Soil Gard <br /> Germination Survival Germination Survival <br /> Leached. . . . . . 64 61 55 53 <br /> Unleached. . . . 30 16 14 6 <br /> Subsequently, selected chemicals were tested on differing types of tail- <br /> ings both indoors and outdoors. From these and allied tests to determine .seed, <br /> fertilizer, climatic, economic, time, and other requirements, a general proce- <br /> dure was developed. This comprised planting the tailings with a mixture of <br /> fertilizer and grass , legume, and grain seeds , watering the plot , and applying <br /> a stabilizing chemical-in-water solution. <br /> Preliminary tests on several types of mineral wastes indicated that the <br /> addition of 45 pounds per acre each of urea and calcium-treble-superphosphate <br /> provided sufficient fertilizer to stimulate growth of most plants. Since sub- <br /> sequent tests revealed that use of this much urea apparently inhibited germi- <br /> nation of legumes, a series of tests was made to determine the effect of urea <br /> and calcium-treble-superphosphate on various legume and grass seeds in quanti- <br /> ties of 25, 45, 75, and 120 pounds per acre of each. Comparable tests , in <br /> which ammonium sulfate and ammonium nitrate were added as sources of nitrogen, <br /> were also run. In all instances , the legumes showed a progressive decline in <br /> germination as the quantity of nitrogen added was increased, regardless of the <br /> form in which the nitrogen was present. At 75 pounds nitrogen per acre, most <br /> of the legume seeds failed to germinate; and at 120 pounds per acre, legume <br /> germination was zero. The grass seeds conversely did not show any inhibition <br /> of germination when fertilizers were added in these quantities. The addition <br /> ` of phosphate fertilizer only in quantities up to 120 pounds per acre had no <br /> _"= s adverse effect on germination. A few tailings required potassium (K) , in <br /> x� which case up to 40 pounds of K per acre was added. <br /> All seeds used for planting were selected for compatibility with the par- <br /> "t ticular climatic environment in which the tailings were located. A suitable <br /> grain was added to the seed mixture to provide early growth for assisting the <br /> chemical in stabilizing the surface. The chemical, preferably a resinous <br />