thers it should be plowed in the spring. Conditions
of soil and climate govern this feature of the work. Usually, however,
the longer the soil is plowed and then properly worked on the surface
before receiving the seed, the finer, cleaner, firmer and moister it is
likely to be, and the larger the store of the available fertility to
promote the growth of the young plants. Because of this, after
cultivated crops, the ground is not usually plowed or otherwise stirred
on the surface.

When the soil is low in fertility, it may be necessary to fertilize it
before a crop of mammoth clover can be successfully grown. For such
fertilization, farmyard manure is very suitable. When soils are low in
the content of humus, before a good crop of clover can be grown, it may
be necessary to supply humus. But few soils are so deficient in
fertility that they will not grow clover if supplied with humus.
Farmyard manure supplies both humus and fertility, but in its absence, a
crop of rye buried in the soil will insure a stand of clover. In other
instances it may be necessary to follow with some kind of a crop that
has much power to gather plant food, as corn of some hardy variety, and
to graze or otherwise feed it from the land.

=Sowing.=--Much of what has been said about the sowing of medium red
clover will apply also to the sowing of mammoth clover. East of the
Mississippi and north of the Potomac and Ohio rivers, mammoth clover is
usually sown in the spring, and for the reason that the young plants are
frequently killed by the severity of the winter weather when sown in the
autumn. But when sown at that season, the seed being mixed with winter
rye and being deposited by the drill as early as September 1st, the
plants frequently survive the winter as far north as Marquette County in
Wisconsin. The rye in the line of the drill marks provides a sufficient
protection for the clover. But this only occurs where the conditions are
eminently favorable to the growth of the clover. Around Puget Sound it
may also be sown with advantage in the early autumn, as then it should
produce a full crop the next season, and the same is true of nearly all
the Rocky Mountain valley region, but in these areas it may also be sown
in the spring. Between the Mississippi and the Rocky Mountains and
Oklahoma and Canada, spring sowing is usually preferable, and in much of
the area is an absolute necessity to insure a stand. In the South the
seed may be sown fall or