252 



INDEX 



Manure, farm, 221. 



farm, agricultural evaluation of, 

 226. 



farm, an unbalanced fertilizer, 223. 



farm, application to land, 231. 



farm, chemical composition of, 222. 



farm, commercial evaluation of, 

 225. 



farm, covered barnyard for, 230. 



farm, deterioration of, 226. 



farm, experiments with, 233. 



farm, fermentations of, 227. 



farm, leaching of, 227. 



farm, methods of handling, 230. 



farm, place in crop rotation, 231. 



farm, protected more effective, 228. 



farm, reinforcing, 229. 



farm, solid and liquid, 221. 



green, crops used for, 238. 



green, materials supplied by, 236. 



green, handling, 240. 



green, nature of, 235. 



green, protective action, 235. 



green, when to use, 239. 



horse, partial composition of, 222. 



quantities voided by animals, 224. 



sheep, partial composition of, 222. 



swine, partial composition of, 222. 



value from different animals, 225. 

 Marine soils, composition of, 24. 



described, 24. 



distribution of, 24. 



formation of, 24. 

 Mechanical analysis of soil, 31. 



determination of class from, 34. 



method for, 46. 



of some typical soils, 32. 



relation of crops to, 32. 



size of separates, 32. 

 Mechanical composition of various 



soil classes, 34. 

 Metamorphic rocks, 5. 

 Minerals, from which rocks are 

 formed, 6. 



soil-forming, laboratory exercise, 8. 



plant-food materials in, 7. 



relation to soil, 6. 

 Moisture, see water. 

 Muck, origin, 21. 



relation to lime and potash, 22. 

 Mulch, depths of, 75. 



Mulch, effectiveness of, 75. 



frequency of stirring, 74. 



of soil, nature and use, 74. 

 Mulches, for moisture control, 74. 



test for conservation of water by, 

 87. 



Nitrate formation, depths of occur- 

 rence, 135. 



effect of aeration on, 132. 



effect of lime on, 189. 



effect of sod on, 134. 



effect of temperature on, 133. 

 Nitrate of soda, effect on soils, 159. 



sources and composition, 157. 

 Nitrates, as plant-food material, 156. 



crops markedly benefited by, 158. 



loss in drainage water, 135. 



test for, in soil, 140. 

 Nitrification, 132. 



Nitrogen, animal products contain- 

 ing, 163. 



availability in fertilizers, 166. 



effects on plant growth, 165. 



fixation, nature of, 136. 



fixation by free living germs, 139. 



fixation by plants, 137. 



forms in fertilizers, 157. 



forms in which used by plants, 156. 



in fertilizers, 155-170. 



in soils, quantities of different 

 forms, 155. 



organic, direct utilization by 

 plants, 156. 



organic, fertilizers containing, 162. 



vegetable products containing, 163. 

 Nodules, examination for, 142. 



on leguminous plants, 137. 



Orchards, fertilizers for, 209. 

 Organic matter, and drainage, 53. 



and formation of acids, 55. 



and nitrogen, 54. 



and plant-food material, 54. 



and soil color, 53. 



and soil organisms, 54. 



benefits of, 52. 



effect on structure, 41. 



effect on availability of plant nu- 

 trients, 102. 



estimation of, 58. 



