147 



Residual fertilizing effects of coicpeas and velvet beans 

 cm sorghum, oats, and late sorghiun groicn as 

 second, third and fourth crops after 

 these legumes. 



These same plots were planted with drilled sorghum 

 without any nitrogenous fertilizer in April, 1900; with 

 red oats without nitrogenous fertilizer in November, 

 1900, and again with drilled sorghum without any ni- 

 trogenous fertilizers, July 18, 1901. 



Fertilizing effects of cowpeas and velvet bean vines 



groivn in 1808 on sorghum in 1900 and 



as a second crop in 1901. 



As compared with the plot not recently in legumes the 

 increase of sorghum hay per acre in 1900 from cowpeas 

 grown two years before was 3 tons per acre, or 59 per 

 cent. ; from velvet beans two years before the increase 

 in 1900 was 3.1 tons of hay, or 61 per cent. 



The increased yield with late sorghum, which was the 

 fourth crop after the plowing in of the vines of the 

 legumes, was, after cowpeas, .5 of a ton, and after velvet 

 beans .6 of a ton. In the two sorghum crops the total 

 increase in yield attributable to legumes was, with cow- 

 peas, 3.5 tons of hay, and with velvet beans 3.7 tons of 

 sorghum per acre. 



