CONTENTS XV 



Chapter Page 



XVIII. THE AFTER-CULTIVATION OF CROPS . . . 164 

 Loss of water by evaporation . . .164 

 Loss of water through weeds . . . 165 



Saving the water 165 



Time to cultivate t 166 



Tools for after-cultivation .... 167 

 Hilling and ridging 169 



XIX. FARM MANURES 171 



The functions of manures and fertilizers . 171 



Classification 171 



Importance of farm manures . . . 172 

 Barn or stable manure . . . .173 



Loss of value 173 



Checking the losses . . . . .176 

 Applying the manure to the soil . . .177 

 Proper condition of manure when applied 179 

 Composts 181 



XX. FARM MANURES, CONCLUDED . . . .183 

 Green-crop manures : 



Functions 183 



Benefits 185 



Character of best plants for green-crop 



manuring 185 



The time for green-manure crops . . 186 

 Leguminous green-manure crops . . 186 

 Non-leguminous green-manure plants . 191 



XXI. COMMERCIAL FERTILIZERS . . . . . 192 



The raw materials 192 



Sources of nitrogen 193 



Sources of phosphoric acid .... 195 



Sources of potash 199 



Sources of lime 200 



XXII. COMMERCIAL FERTILIZERS, CONTINUED . . 202 

 Mixed fertilizers: 

 What they are 



