64 KNAPP METHOD OF GROWING COTTON 



should be grown liberally and turned under 

 to furnish humus, and keep the soil in good 

 mechanical condition. 



4. The greatest benefit to be derived from 

 commercial fertilizers is in combination with 

 farm manures and green crops turned under. 

 A much more liberal application can be made 

 profitable under these conditions. 



5. A general and rather liberal use of 

 commercial fertilizer can be recommended 

 if intelligence and good judgment is displayed. 



6. Excessive and reckless use of commercial 

 fertilizer should be avoided. Beyond a certain 

 limit profits are much more uncertain. 



7. One application on clay soils has been 

 found as satisfactory as more where less than 

 500 pounds per acre were used. Quickly 

 available substances, such as nitrate of soda, 

 should be applied to growing crops. When 

 large amounts of fertilizer are used, and 

 on special soils, two applications are sometimes 

 more profitable. 



8. Where all the benefits from fertilizers 

 are desired the first season, only readily avail- 

 able materials should enter into its composition. 

 For permanent improvement of the soil more 



