151 



sets of plots, the cotton plants being much larger, 

 greener, and more luxuriant on the plots where velvet 

 beans had grown the year before. 

 Av. vield of seed cotton per acre follomng 



velvet bean vines 1,578 lbs. 



Av. yield of seed cotton per acre following 



cotton 918 lbs. 



Increase from velvet bean vines 660 lbs. 



The average increase attributable to velvet beans used 

 as a fertilizer was 680 pounds of seed cotton per acre, a 

 gain of 72 per cent, as compared with the average y^eld 

 on plots where the preceding crop had been cotton. 

 At 2i cents per pound of seed cotton (equivalent to 

 6f cents per pound for lint and |7.50 per ton for seed) 

 this increase is worth .$16. 50 per acre. 



Residual fertilizing effects on com of velvet hean 



vines. 



The residual ,or second-^^ear, effects were tested on 

 corn planted on these plots March 29, 1900, without 

 nitrogenous fertilizer. 



Where cotton had grown in 1898 the yield of corn in 

 1900 was 18 bushels per acre; on the next plot, w^here 

 velvet beans had been grown for fertilizer in 1898, the 

 vield of corn in 1900 was 25.5 bushels. This gain of 

 7.5 bushels per acre, or 12 per cent., represents the resi- 

 dual or second-year effect of using the entire growth of 

 velvet beans as a fertilizer. 



Immediate and Residual Effects of Velvet Bean 

 Stubble ox Cotton and Corn. 



In the same field the velvet beans on one plot were 

 cut for hav October 12, 1898. The stubble and roots 



