LEGUMINOUS PLANTS. 125 



twice the amount of digestible nutrients as that 

 of one acre of oats yielding forty bushels, and 



FIG. 34. THE SOY-BEAN. 



40 per cent, more than that produced by an acre 

 of corn yielding thirty bushels. 



When cow-peas are grown to enrich the soil 

 the hay may be fed to stock and the manure 

 returned to the field, or the vines may be plowed 

 under in the fall, and the field sown in oats, rye, 



