122 COTTON 
PARTS OF AN AVERAGE COTTON PLANT 
(Continued) 
Part Per cent 
eek, ces aa eatee ae eee te ween 23 .03 
SEMIS aces teh he Cate ee ees re eae 23.15 
MESO belles tea Seen rary meg 100.00 
Elsewhere it has been stated that 190 pounds of 
cotton lint is the average annual yield per acre. If 
we use thefollowing 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, 
wecangototheplantitselffortheinformation. 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; 
