358 



INDEX. 



Leguminous crops — 



a substitute for fallow . .212 

 and nitrification . . . 131 

 and nitrogen in soil 104, 125, 129, 

 133, 211 

 continuous cropping with . 114 

 effects of nitrogenous manures 



on Ill 



experiments with . . 100, 126 

 failure of, when grown at short 



intervals . . . .112 

 in rotations .... 208 

 liability to parasitic attacks . 112 



lime for 249 



nitrate of soda for . . . 114 

 nitric acid, a source of . . 134 

 nitrogen for . . 101, 111, 134 

 sources of nitrogen for 123, 125, 129, 

 136, 137 

 yield of nitrogen in . . .101 



Liebig — 



analyses of Rothamsted soil by 94 



views as to rotation-cropping . 197 



„ stock - feeding 260, 284, 



337 



Lime, function of, in — 



plant growth . . . 245, 248 

 rotation and continuous crops . 244 



Live stock — 



feeding of .... 255 

 improvement of 256 



Lucerne, experiments with . .127 



Nitrogen — 



accumulation of, in soil 72. 73, 126, 

 129,' 131, 134 

 and carbon assimilation and 

 chlorophyll formation in 



wheat 175 



and quality of grain ... 87 

 and root crops .... 19 

 and sugar-production in beet 37, 45 

 and the carbohydrates in plants 46, 



106 

 and the formation of fat . . 110 

 application of, to wheat . . 174 

 Nitrogen, assimilation of — 



alternative explanations of . 159 

 and root-nodules 139, 144, 148, 151 

 assistance of lower organisms 155, 160 

 Atwater's experiments . . 137 

 Berthelot's views . . . 144 

 Boussingault's experiments . 137 

 by higher chlorophyllous plants 



uncertain .... 156 

 from the air 51, 100, 126, 129, 131, 

 134, 137 

 fuller information required . 152 

 fully established . . . 153 

 Hellriegel's experiments . .138 

 how to be explained . .153, 159 

 negative results at Rothamsted 140 

 new doctrine regarding . .137 

 ii its practical im- 

 portance . . 161 

 Nobbe's experiments . .150 

 practical importance of . 161, 164 

 recent experiments at Rotham- 

 sted 144 



summary of results . . .165 

 Nitrogen — 



condition of, in roots . . 62 

 n as influenced by 



manures and 

 seasons . . 63 

 consumed and voided by ani- 

 mals .... 328,352 

 dependence of wheat on . .174 

 do mangels draw it from the 



atmosphere? ... 51 



evolution of free . . . 179 

 exhalation and absorption of, 



by animals .... 325 

 exhaustion of, in soil 42, 77, 122 

 fixation of free. See Assimila- 

 tion of. 

 for barley . . 72, 99, 100 



for leguminous crops 101, 111, 134 

 for wheat ... 99, 100, 168 

 in arable land . . . .192 

 in crop-residue .... 179 

 in foods . . . 258, 308, 327 

 in garden soil . . . .121 

 in grass lands .... 192 

 in residue of wheat-crop . . 179 

 in root-nodules . . .159 



in rotation and continuous crops 225 

 in soil after clover . 104, 125, 129 

 ii various leguminous 



crops 126, 133, 211 



ii wheat . . .179 



in soil, and nitrification . .131 



