CONTENTS Xi 



PAGES 



produced during fermentation ; Composting manures ; 

 Uses of preservatives ; Manure produced in sheds ; Value 

 of protected manure ; Use of manures ; Direct hauling to 

 field ; Coarse manures injurious ; Manuring pasture land ; 

 Small piles of manure in fields objectionable; Rate of 

 application ; Most suitable crops to apply to ; Compara- 

 tive value of manure and food ; Lasting effects of manure ; 

 Comparative value of good and poor manure ; Summary 

 of ways in which manures may be beneficial. 



CHAPTER VI 



FIXATION 191-197 



Fixation a chemical change, examples of; Fixation and 

 absorption ; Due to zeolites ; Humus and fixation ; Soils 

 possess different powers of fixation; Nitrates do not 

 undergo fixation ; Fixation of potash, phosphoric acid, 

 and ammonia ; Fixation may make plant food less avail- 

 able ; Fixation a desirable property of soils ; Fixation and 

 the action of manures ; Fixation and soil solution. 



CHAPTER VII 



PHOSPHATE FERTILIZERS . . . ... . 198-211 



Importance of phosphorus as plant food ; Amount re- 

 moved in crops ; Amount and source of phosphoric acid 

 in soils ; Commercial forms of phosphoric acid ; Phosphate 

 rock ; Calcium phosphates ; Reverted phosphoric acid ; 

 Available phosphoric acid ; Manufacture of phosphate 

 fertilizers, acid phosphates, superphosphates ; Commercial 

 value of phosphoric acid ; Basic slag phosphate ; Guano ; 

 Bones ; Steamed bone ; Dissolved bone ; Bone black ; 

 Fineness of division of phosphate fertilizers ; Use of 

 phosphate fertilizers ; How to keep the phosphoric acid 

 of the soil available. 



