INDEX 



275 



Liebig 6, 7, 156, 227 



Liquid manure 147 



Lime, action on soils 198 



amount of, in soils 197 



amount removed in crops • 1 97 



excessive use of 201 



fertilizers 196 



indirect action of 199 



physical action of 201 



use of 20 r 



and acid soil 198 



and clover 199 



Loam soils 24 



Loss of fertility in grain farming, 252 

 Loss of humus 97 



of nitrogen 117, 126 



Losses from manures T57, 158 



Magnesium compounds of soils. .68 

 salts as fertilizers 202 



Mangels, fertilizers for 224 



Manure from cow 152 



hen 154 



hog 154 



horse 152 



sheep 153 



Manures, farm 141 



influenced by foods 144 



use of, in rotations 243 



value of 170 



and soil water 39, 98 



Manurial value of foods 149 



Manuring of crops 166 



pasture land 164 



Marl 200 



Mechanical analysis of soils 17 



condition of fertilizers.. .210 



Methods of farming, influence 



of, upon fertility 100 



Mica 57 



Micro-organisms and soil for- 

 mation 49. 53 



Mixing manures 155 



Movement of water after rains • • 33 

 Mulching 36 



Nitrate of soda 135 



Nitric nitrogen 136 



Nitrification 119 



conditions necessary for 120 



and sunlight 122 



and plowing 127 



Nitrogen assimilation 104 



as plant food 102 



compounds of soil 65 



deficiency of, in soil 219 



losses of, from soil 117 



ratio of, to carbon 116 



removed in crops 1 14 



of commercial fertilizers. 210 



amount of, in soils 113 



as organic forms 112 



as nitrates 114 



availability of 113 



forms of 112 



origin of 1 1 1 



Nitrogenous manures 12S 



Number of soil particles 17 



Odor of soils 46 



Organic acids, action of, upon 



soils 79, 80 



Organic compounds of soil, 



classification of 90 



source of 90 



Organic nitrogen 128, 133 



Organisms, ammonia-producing, 1 23 



of soil. 124 



nitrifying 1 20 



products of 125 



Osborne 18 



Orthoclase 56 



Oxidation in soil 43 



Peat 134, 144 



Percolation 28 



Permeability of soils 38 



Phosphate fertilizers 172 



use of 1 83 



rock 177 



slag 180 



