148 



Now let ns jxo l>ack n few iiioiitlis nnd iiolc llic vicld 

 of tlic oat i'Vi)]) coniinii- lu'twccn tlx* sori^linm crops of 

 101)0 and 11M)1. 



Yield "f ''<ils ill lUill (/roini as I Ik; fliird crop dfter 



Icf/nmt'S. 



Tlip fevtiliziiij^" (^'lect of tlie lej^uines was apparent 

 in the third crop after the legunu'S, the increase where 

 cowjicas had once grown being 3.2 l)iishels of oats per 

 acre, or 14 per cent. The increas<3 wliere velvet beans 

 had been is suspicioiish' large, and in subsequent calcu- 

 lations it will be assumed that the increase in the yield 

 on this plot if not influenced by accidental conditions 

 would liave been no greater than that on the plot once 

 in cowpeas, viz., 3.2 bushels per acre. 



Financial results of using cowpea vines as fertilizers 

 for cotton^ sorghum, oats, and late sorghum. 



Let us convert these yields of cowpeas, cotton, sor- 

 ghum, and oats into their money values to learn 

 Avhether the introduction of cowpeas or velvet beans into 

 the rotation has been profitable. 



