CONTENTS xv 



CHAPTER X 

 EXPERIMENTS UPON CROPS GROWN IN ROTATION, AGDELL FIELD 



PAGE 



I. The Umnanured Plots . . . . . .192 



II. Effect of the Manures ...... 195 



III. The Effect of the Growth of Clover or Beans on the succeeding 



Crops ........ 200 



IV. Effect of Manurial Residues on subsequent Crops . . . 204 

 V. Gain or Loss of Manurial Constituents to the Land . . 209 



Practical Conclusions . . . . . . 214 



References ........ 216 



CHAPTER XI 



NITRIFICATION AND THE COMPOSITION OF DRAINAGE WATERS 



I. The Process of Nitrification . . . . .217 



II. Denitrification . . . . . . .219 



III. Nitrates in Cultivated Soils . . . . .221 



IV. Nitrates in Manured and Cropped Soils .... 223 



V. The Nitrates in Drainage Waters ..... 229 



VI. Other Constituents of Drainage Waters .... 237 

 References ........ 239 



CHAPTER XII 

 THE FEEDING EXPERIMENTS 



I. Relative Value of Nitrogenous and Non-nitrogenous Constituents 



of Food ........ 240 



II. Relation of Nitrogenous Food to Work .... 245 



III. The Source of Fat in the Animal Body . . . .246 



IV. Relation of Food consumed to Live-weight Increase . . 248 

 V. The Composition of Oxen, Sheep, and Pigs, and of their Increase 



during Fattening ...... 250 



VI. The Manure Value of Foods ..... 254 



VII. Miscellaneous Feeding Experiments .... 258 

 References . . . . . . .259 



CHAPTER XIII 

 MISCELLANEOUS ENQUIRIES 



I. Experiments upon Sewage Irrigation .... 260 



II. Experiments upon Malt and Barley .... 261 



III. Experiments upon Ensilage ..... 266 



IV. The Composition of Wheat Grain and its Mill Products . . 268 

 References . 272 



