INDEX 



Absorbents 143 



Absorption of heat by soils 42 



Absorptive power of soils 46 



Acids in plant roots 228 



Aerobic ferments 121, 158 



Agricultural geology 49 



Agronomy 9 



Albite 56 



Alkaline soils 87 



Aluminum of soils 66 



Amendments 205 



Ammonium compounds 115 



salts 136 



Anaerobic ferments 159 



Analysis of soil, how made- -73, 74 



of soil, value of 76, 80 



Apatite rock 58 



Application of fertilizer 222 



of manures 163, 165 



Arrangement of soil particles 16 



Ashes 191 



action of, on soils 192 



testing of 1 93 



Assimilation of nitrogen 102 



of phosphates 1 73 



Atmospheric nitrogen 104 



Atwater . . ■- 108, 132 



Availability of plant food 79 



Available phosphates 177, 184 



nitrogen 113, 133 



Barley, fertilizers for 223 



food requirements of • • • • 231 



Blood, dried 1 28 



Bone, dissolved 183 



fertilizers 18 r 



Boneash 182 



Bone-black 183 



Boussingault's experiments 



4, 104, 105, 106 



Calcium an essential element ..196 

 carbonate and nitrific'on . 123 



compounds of soils 67 



phosphate 58, 1 75 



Capillarity 27 



and cultivation 31 



Carbon of soil 63 



sources for plant growth . .63 



Chlorine of soil 64, 87 



Clay, formation of 58 



particles 13 



Clover as manure 134 



nitrogen returned by .... 



108, 118, 253 



root nodules no 



manuring of- 194, 199, 224,237 



Coal ashes 193 



Color of plants, influenced by 



nitrogen 104 



of soils 45 



Combination of elements in soils. 61 



Commercial fertilizers 205, 225 



and tillage 216 



abuse of 216 



extent of use 205 



field tests with 218 



home mixing of 214 



inspection of 209 



mechanical condition of .210 



nitrogen of 210 



phosphoric acid of 211 



potash of 212 



proper use of 217 



valuation of 213 



Composition of soils 83, 85 



Composting manures 160 



Corn, fertilizers for 223 



food requirements of 232 



and manure 167 



Cotton, fertilizers for 235 



