139 



Ripening stage. Blooming stage. 

 Lbs. nitrogen. Lbs. nitrogen. 



In hay 55.8 53 . 6 



In fallen leaves, etc 23.1 10.9 



In roots and stubble 8.3 5.3 



Total per acre 87.2 69.8 



The total amounts of nitrogen stored up by the cow- 

 pea plant on one acre was in one case 87.2 pounds, in 

 the other 69.8 pounds, equivalent, respectively, to the 

 nitrogen in 1.216 and 997 pounds of cotton seed meal. 



Of this amount there was left in and on the soil when 

 mowing occurred late 31.4 pounds of nitrogen ; and from 

 the younger plants 16.2 pounds per acre. This is equiva- 

 lent to the statement that the nitrogen per acre remain- 

 ing after the ^ines were removed was equal to the 

 amount contained in 116 or 231 pounds of cotton seed 

 meal. 



Of the total nitrogen in the plant, the roots, stubble, 

 and fallen material contained 34 per cent, at the ripen- 

 ing stage, and 23 per cent, at the blooming period. 



Considering the three tests together the total amounts 

 of nitrogen per acre of cowpeas was 70.2 pounds in the 

 entire growth, of which the average amount in the 

 stubble was 19.75 pounds, or 2S per cent. 



CowPEA Stubble versus Cowpea Vines as Fertilizer 



FOR Corn in 1901. 



Corn was grown in 1901 on sandy loam land, which, 

 in 1900 had borne a light crop of drilled cowpeas, 

 planted after the removal of the oat crop of 1900. 



Three plots were employed. On one the peavines had 

 been cut the previous September, yielding 1,618 pounds 

 of hay per acre. On the other two plots no vines nor 

 peas were harvested but the entire growth, which was 



