350 



INDEX 



Subsoiling, 40. 



Sugar beets, and farm manures, 185; 



fertilizers for, 265. 

 Sugar beet soils, 24. 

 Sulphate -of potash, 217. 

 Sulphur compounds of soil, 75. 

 Superphosphates, 204. 

 Surface subsoil, mixing of, 297. 



Tankage, 149. 



Taste of soils, 51. 



Temperature of soils, 46. 



Testing for nitrates, 322. 



Tests with fertilizers, 248. 



Thaer, work of, 3. 



Tobacco, manuring of, 186. 



Tobacco stems, 221. 



Transported soils, 62. 



Truck farming and fertilizers, 269. 



Tull, 8. 



Turnips, fertilizers for, 254, 266. 



Van Helmont, i. 



Vegetation and soil formation, 61. 



Ville, 121. 



Volatilization of ammonium salts, 322. 



Volcanic soils, 64. 



Volume of soils, 13. 



Voorhees, 243, 269. 



Warington, 8, 139. 



Washing of land, 300. 



Water, action of, upon rocks and 

 soils, 56; in rock decay, 59; bot- 

 tom, 29; capillary, 30; capillary 

 conservation of, 36-38. 



Water holding, capacity of soils, 311; 

 hydroscopic, 32; losses by evapo- 

 ration, 33; losses by percolation, 

 32; losses by transpiration, 34; of 

 soil, 29, 34; of soil influenced by 

 drainage, 34; by forest regions, 35; 

 by manures, 45; by mulching, 42; 

 by plowing, 41; by rolling, 40; 

 by subsoiling, 40; required by 

 crops, 28; soluble matter of soils, 

 196. 



Weeds, cultivation to destroy, 297; 

 fertility in, 231. 



Weight of soils, 12; how determined, 



3 J 3- 

 Wheat, fertilizers for, 253; food 



requirements of, 260; soils, 25-26. 

 Whitney, 19, 52. 

 Wilfarth, 124. 



Wind as agent in soil formation, 62. 

 Winogradsky, 8. 

 Wood ashes, 218. 

 Wool waste, 152, 231. 



Zeolites, 67, 191. 



