CONTENTS XV 



PAGES 

 L/rlilJr 1 ILK AA 



Manure 



Composition 210 



Losses from Manure 212 



Value 213 



Influence on Number of Bacteria in Soil 215 



Ammonification 215 



Nitrification 216 



Green Manure 217 



v^JrlAjr J. xLiSs. AAl 



TJ^e Influence of Irrigation Water on Soil Fertility 



Ammonification 219 



Nitrification 220 



Other Acids 221 



Salts Carried from Soil by Water ., zzi 



Loss of Nitrogen 222 



Plant P'ood Carried to a Soil hy Irrigation Water 223 



Nitrogen Fixation 224 



Alkali of Water , 225 



