122 COTTON 



PARTS OF AN AVERAGE COTTON PLANT 



(Continued) 

 Part Per cent. 



Seed 23.03 



Stems. , 23 . 15 



Total 100,00 



Elsewhere it has been stated that 190 pounds of 

 cotton lint is the average annual yield per acre. If 

 we use the following table of percentages, therefore, 

 we find that an average crop of cotton contains : 



190 pounds lint; 



157 pounds roots; 



256 pounds bolls; 



364 pounds leaves; 



414 pounds seed; 



416 pounds stems. 



QUANTITIES OF PLANT FOOD REQUIRED 



In ascertaining the demands of the cotton plant 

 in respect to nitrogen, phosphorus, and potassium, 

 we can go to the plant itself for the information . Pro- 

 fessor McBryde has analyzed a great many cotton 

 plants, and from his work the amount of plant food 

 used by each part is readily calculated. In this dis- 

 cussion, the reader must observe that only nitrogen, 

 phosphorus, and potassium are considered, since 

 they are the only elements purchased in commer- 

 cial forms, the others being usually available in suf- 

 ficient quantities in the soil. These facts are shown 

 in the following table; 



