54 KNAPP METHOD OF GROWING COTTON 



6.5 per cent, of nitrogen can be bought for 

 $28 per ton. 



TABLE II. VALUES PER TON OF COTTON SEED MEAL OF 



DIFFERENT GRADES 



The average sample of cotton seed meal con- 

 tains approximately the following percentages 

 of plant food. 



Nitrogen 6.4 per cent. 



Phosphoric Acid 2.7 per cent. 



Potash 1.8 per cent. 



A loo-pound sack will therefore contain the 

 following quantities of plant food. 



Nitrogen 

 Phosphoric acid 

 Potash 



6.4 pounds 



2-7 " 

 1.8 " 



The results following the use of cottonseed 

 meal indicate that decomposition makes the 

 phosphoric acid in the meal available. In 

 buying materials for mixing fertilizers it is 



