135 



The following table sllO^YS what percentage of the 

 total air-dry weight of the plants of each variety was 

 available for fertilizing purposes after the removal of 

 the hav. 



Per cent, of the entire tceight of the coivpea plant in 

 stuhhle and roots and in fallen leaves and leaf stalks. 



The average for the six varieties shows that in each 

 100 pounds of dry plants there were 15.5 pounds of 

 fallen leaves and leaf stalks, and 21.1 pounds of roots 

 and stubble, making a total of 36.6 pounds, more 

 than one-third of the entire plant being thus left on the 

 ground for fertilizer after the hay was cut. 



Analyses of the different parts of the plant made by 

 Prof. C. L. Hare, of the chemical department of this 

 station, are recorded in the following table. 



Composition of parts of the air-dry coiupea plant. 



Let us direct our attention to the nitrogen, since this 

 is the only one of the three precious elements that the 

 plant obtains ( in part ) from the air, and the only one in 



