XIV 



CONTENTS 



fertilizers, § 218 ; Relative values of organic and 

 inorganic nitrogenous fertilizers, § 219. 



Questions on Chapter XI ....... 



Laboratory Exercises ....... 



Influence of nitrogen on plant growth, I ; Exami- 

 nation and identification of nitrogen fertilizers, II; 

 Comparison of fertilizer effects on plant growth, III. 



168 

 168-170 



CHAPTER XII 



Phosphoric Acid Fertilizers 171-176 



Bone phosphate, § 220; Mineral phosphates, 

 § 221 ; Basic slag, § 222 ; Acid phosphate, § 223 ; Com- 

 position of acid phosphate, § 224 ; Reverted phos- 

 phoric acid, §,225; Absorption of acid phosphate by 

 soil, § 226 ; Relative availability of phosphoric acid 

 fertilizers, § 227 ; Rock phosphate versus acid phos- 

 phate, § 228 ; Effect of phosphoric acid on plant 

 growth, § 229 ; Plants particularly benefited by 

 phosphoric acid, § 230. 



Questions on Chapter XII 176-177 



Laboratory Exercises ....... 177-178 



Influence of phosphoric acid on plant growth, I; 

 Examination and identification of phosphate fer- 

 tilizers, II; Comparison of fertilizer effects on 

 plant growth, III. 



CHAPTER XIII 



Potash and Sulfur Fertilizers 



Stassfurt salts, § 231 ; Wood ashes, § 232 ; Insolu- 

 ble potash fertilizers, § 233 ; Effects of potash on 

 plant growth, § 234 ; Sulfur as a fertilizer, § 235 ; 

 Experiments with sulfur as a fertilizer, § 236 ; 

 Quantities of sulfur contained in crops, § 237 ; 

 Quantities of sulfur in soils, § 238 ; Quantities of sul- 

 fur in drainage water, § 239 ; Sulfur contained in fer- 

 tilizers, § 240. 



179-185 



