CONTENTS 



PAGES 



Soil analysis 162 



Physical analysis 163 



The use of nitrogen . 164 



Phosphoric-acid requirements 165 



The need of potash 166 



Fertilizer tests 167 



Variation in soil 168 



CHAPTER XVII 



COMMERCIAL SOURCES OF PLANT-POOD .... 171-187 



Acquaintance with terms 171 



Nitrate of soda 171 



Sulphate of ammonia 173 



Dried blood 173 



Tankage 174 



Fish 175 



Animal bone 175 



Raw bone 177 



Steamed bone * . . 178 



Rock-phosphate 178 



Acid phosphate 180 



Basic slag 183 



Muriate of potash 184 



Sulphate of potash 185 



Kainit 185 



Wood-ashes 185 



Other fertilizers 186 



Salt 186 



Coal-ashes . ... t .... 187 



Muck 187 



Sawdust 187 



CHAPTER XVIII 



PURCHASING PLANT-FOOD 188-197 



[xi] 



