148 



As a fertilizer for sorghum velvet bean vines proved 

 superior to eowpea vines, and to velvet bean stubble. 



The stubble of cowpeas and of velvet beans was of 

 practically equal fertilizing value. 



Residual fertilizing effect of legumes on com grown as 

 the second crop after eowpea- and velvet hean vines 

 and coicpea and velvet hean stahble. 

 March IT, 19C0, the sorghum stubble in the experi- 

 ment just discussed was turned with a one-horse plow 

 and March 29 corn was planted on all plots. 



''Fertilizing effects in 1900 of stuhhle and vines of cow- 

 peas and velvet heans grotcn in 1898. 



Let it be noted that the heavy growth of sorghum in 

 1899 did not utilize all of the fertilitv derived from the 

 preceding crop of legumes. Although sorghum is a plant 

 that is especially exhaustive to soil fertilitv, there still 

 remained for the corn crop of 1900 a residue of nitrogen 

 from the eowpea and velvet bean vines of 1898 sufficient 

 to increase the vield of corn to the extent of 3.6 bushels 

 per acre where cowpeas had grown two years before, 

 and 2.6 bushels where velvet beans had grown. This is 

 an average of 3.2 bushels per acre as the residual fer- 

 tilizing effect of these legumes. 



