Following the alfalfa, we sow a mixture of rye and vetch which is plowed
under when the rye is in head and the vetch in bloom as at this time the
vetch (which also is a legume) attains its greatest development of
nitrogen nodules and the rye its greatest humus value. After this has
been incorporated with the soil and a pulverized seed bed formed as
before, it is seeded to a mixture of cow-peas and buckwheat.
[Illustration: OPERATIONS _and_ EQUIPMENT EMPLOYED _in_ PRODUCING
KELLOGG PEDIGREE PLANTS