INDEX 



347 



Gains, of humus, 114; of nitrogen, 



i33- 



Garden crops, fertilizers for, 269. 

 Geological study of soil, value of, 69. 

 Gilbert, 7. 



Glaciers, action of, 57. 

 Grain soils, 24. 

 Granite, 66. 



Grass lands, fertilizers for, 268. 

 Grass soils, 24. 

 Guano, 207. 

 Gullying of soils, 300. 

 Gypsum and manure, 179. 



Hair, 152. 



Hay land, fertilizing, 268. 



Heat, and crop growth, 50; pro- 

 duced by manures, 178; of soil, 46, 

 50; required for evaporation, 46. 



Heiden, 174, 180. 



Hellriegel, 22, 28, 123. 



Hen manure, 172. 



Hog manure, 172. 



Hops, fertilizers for, 267. 



Hornblende, 65. 



Horse manure, 170. 



Human excrements, 174. 



Humates, 103; as plant food, 107. 



Humic acid, 112. 



Humic phosphates, 105, 210. 



Humifi cation, 104. 



Humus, 103; active and inactive, 114; 

 causes fixation, 192; composition 

 of, 106; extraction of, trom soils, 

 321; loss of, from soils, in; soils 

 in need of, 113. 



Hydrogen, compounds of soil, 77. 



Hydroscopic moisture, 32; deter- 

 mination of, 310. 



Importance of field trials, 251. 

 Income and outgo of fertility, 286, 290. 

 Infected seed and soil diseases, 301. 

 Inherent fertility, 304. 

 Injury of coarse manures, 46, 182. 



Inoculation of soils, 143. 

 Insoluble matters of soils, 82. 

 Iron compounds of soil, 80. 



Jenkins, 152. 



Kainit, 179, 216, 243. 

 Kaolin, 67. - 

 King, 37, 40, 41. 



Laboratory note- book, 307; practice, 



308, 326. 



Lawes and Gilbert, 6, 121, 122, 260. 

 Lawn fertilizers, 272. 

 Leached ashes, 219. 

 Leaching of manure, 175. 

 Leather, 152. 

 Leguminous crops, fertilizers for, 



269; as manure, 154; nitrogen 



assimilations of, 122, 125. 

 Liebig, 5, 6, 174, 257. 

 Lime, action on soils, 225; amount 



of, in soils, 224; amount removed 



in crops, 224; excessive use of, 229; 



fertilizers, 225; indirect action of, 



227; physical action of, 228; 



stone, 68; use of, 229; lime and 



acid soil, 226; and clover, 226. 

 Liquid manure, 164. 

 Loam soils, 27. 

 Loss, of fertility in grain farming, 287 ; 



of humus, in; of nitrogen, 132, 



i45- 

 Losses from manures, 176-177. 



Magnesium compounds of soils, 79. 



Magnesium salts as fertilizers, 230. 



Mangels, fertilizers for, 254. 



Manure, from cow, 170; hen, 172; 

 hog, 172; horse, 170; sheep, 171. 



Manures, farm, 158; composition of, 

 159; composting of, 178; crop 

 producing value, 168; direct ap- 

 plication of, 181; fermentation of, 

 177; influence of, on soil tempera- 



