COTTON CULTURE 



6 7 



TA.BLE GIVING THE AMOUNTS OF FERTILIZING INGREDI- 

 ENTS (POTASH, PHOSPHORIC ACID, AND NITROGEN) CON- 

 TAINED IN THE CROP FOR ONE ACRE. 



* Crimson clover. 



APPENDIX 



DESCRIPTION OF FERTILIZER MATERIALS 



Broadly speaking, there are two kinds of fertilizers: 

 those which are in themselves a direct source of plant food, 

 and those which by their action tend to make plant-food 

 fertilizers more available. While crops may be grown 

 without the use of fertilizers of the second class, no crop 

 can live without the fertilizers of the first class, even though 

 ample applications be made of the former. 



