In reading of the studies of soil fertility that were made by George Washington at Mount Vernon, we learn of the improvement that he made in the relatively poor soils of that area by growing plants of the legume family.
"A Living from the Land"
William B. Duryee
If it is not known that the legume to be planted has been grown successfully in a given field within the previous several years, the precaution of adding the proper bacteria should be taken.
"A Living from the Land"
William B. Duryee
The old forms of crop rotation with fallow periods were often displaced by legume-rotation field-grass agriculture.
"Our Legal Heritage, 4th Ed."
S. A. Reilly