4i6 



INDEX 



browsing on reproduction of aspen, 

 206, 212; on protected aspen land, 

 (fig.) 207; remnants of aspen sprouts, 

 (fig.) 208; number grazed on Na- 

 tional Forests in 1921, 232; losses due 

 to poisoning, 241 ; driving and herd- 

 ing, 247; characteristic symptoms 

 of poisoning by death camas, (fig.) 

 264; losses from water hemlock, 

 265; losses from lupine, (fig.) 268; 

 water requirements, 296; best land 

 for grazing, 355; forage preferences 

 of, for study in grazing course, 367; 

 forage requirements of, for study 

 in grazing course, 371, 387; manage- 

 ment of, for study in grazing course, 

 379; cost of production, for study in 

 grazing course, 382; on winter range, 

 study of, in grazing course, 388. 



Sheep-shooting associations, 14. 



Sheet erosion, 176; due to overgraz- 

 ing, (fig.) 183. 



Shepherd 's-purse, growth after burn- 

 ing brushland, 226. 



"Shoestring gullies," 176; on seeded 

 terrace, (fig.) 194. 



Silage, supplemental feed, 335; for 

 study in grazing course, 387. 



Silt, in reservoirs, 303. 



Silvics, important forestry subject, 390. 



Silviculture, important forestry sub- 

 ject, 390. 



Silanion, mechanically injurious, 286. 



Slag, basic, as fertilizer, 99. 



Slope, steepness of, factor in erosion, 

 177- 



Smuts, poisonous to livestock, 243. 



Snakeroot, name for water hemlock, 

 264. 



Snakeweed, sign of overgrazing, 106; 

 name for water hemlock, 264. 



Sneezevveed, sign of overgrazing, 106; 

 indicator plant, 129; harmful to 

 sheep, 245; method of eradicating, 

 247. 



Sneezeweed, western, habitat and de- 

 scription, 277; (fig.) 278; poison- 

 ous to stock, 277. 



Snow, melting, factor in erosion, 177, 

 180. 



Snowberry, sign of overgrazing, 106. 



Soap plant, name for death camas, 

 261. 



Sod. efiFect of harrowing and disking, 

 95- 



Sodgrasses, withstand early grazing, 

 88; on permanent pasture, 88; 

 form of growth, go; typical form, 

 (fig.) 92; cause of decline in j-ield, 

 95- 



Sodium benzoate, for larkspur poi- 

 soning, 258. 



Sodium nitrate, as fertilizer, 100. 



Soil, in seeding tests, 41, 44; lack of 

 treatment of, cause of failure of 

 seeding tests, 48; fertile, for seed- 

 ing to cultivated forage plants, 55; 

 loosened by harrowing or plowing, 

 57; hard-packed, loss of seedlings 

 on, 67; fertility, requires good pas- 

 ture feed, 86; fertile, essential for 

 forage production, 88; alluvial, for 

 pasture land, 88; fertility, main- 

 tained on permanent pasture, 88; 

 texture changed by injudicious graz- 

 ing, 89; acid, corrected by lime, 99; 

 needs fertilizers, 99; fertility, main- 

 tained by fattening cattle or sheep 

 on the land, 100; soft and wet, 

 bad for stock, 100; depleted, in- 

 dicated by weeds, loi; relation of, to 

 forage production, 106, 113; of first 

 or early weed stage, 115; require- 

 ments of forage plants, 132; for 

 Kentucky bluegrass, 133; for Can- 

 ada bluegrass, 135; for Hungarian 

 bromegrass, 139; for redtop, 140; 

 for timothy, 141; for Johnsongrass, 

 144; for Sudangrass, 145; infertile, 

 grass mixture for, 149; efi'ect of 

 erosion on, 171, 174; t>'pe of, factor 

 in erosion, 177; typesof, 178; removal 

 of, by wind, (fig.) 181; eroded and 

 nonerodcd, study of, in Wasatch 

 Mountains, 183, 184; loose, wet, bad 

 effects of trampling on, 192; wash- 

 ing, prevented by vegetative cover, 

 194; enriched by decomposition 

 of vegetation, 221; burning de- 

 structive to, 222, 229, 230; problem 

 of South, to maintain organic matter 

 of, 223; effect of crown fires on, 234; 

 depletion, caused by excessive graz- 

 ing, 235; eroded and noneroded, 

 plant foods and forage production 

 in, in study course, 375. 



Solidago, growth after burning brush- 

 land, 226. 



Solomon's-seal, false, indicator plant, 

 129. 



Sophia incisa, in first or early weed 

 stage, lis, (%■) 116; on eroded 

 and on noneroded pasture, (fig.) 118; 

 on bed ground, (fig.) 121; on range 

 grazed annually, (fig.) 122; on pro- 

 tected plot, (fig.) 123; indicator 

 plant, 1 28; on chart plot, (fig.) 342. 



Sorghum, introduced from Old World, 

 55; growing of, to eradicate Ber- 

 mudagrass, 136. 



