o become more so in the future, especially when grown for
pasture.

When sown to produce pasture, unless for one or two seasons, clover seed
is sown in various mixtures of grasses in all or nearly all instances.
The grasses add to the permanency of the pastures, while the clovers
usually furnish abundant grazing more quickly than the grasses. Several
of them, however, are more short-lived than grasses usually are, hence
the latter are relied upon to furnish grazing after the clovers have
begun to fail. In laying down permanent pastures, the seed of several
varieties is usually sown, but in moderate quantities. The larger the
number of the varieties sown that are adapted to the conditions, the
more varied, the more prolonged and the more ample is the grazing
likely to be.

When clovers, except the crimson variety, are sown for the exclusive
purpose of adding to the fertility of the land, they are usually sown
along with some other crop that is to be harvested, the clover being
plowed under the following autumn or the next spring. These are usually
sown without being mixed with other varieties, and the two kinds most
frequently sown primarily to enrich the land are the medium red and
crimson varieties. The former grows more quickly than other varieties,
and the latter, usually sown alone, comes after some crop already
harvested, and is buried in time to sow some other crop on the same land
the following spring.

=Sowing with or without a Nurse Crop.=--Nearly all varieties of clover
are usually sown with a nurse crop; that is, a crop which provides shade
for the plants when they are young and delicate. But the object in
sowing with a nurse crop is not so much to secure protection to the
young plants as to get them established in the soil, so that they will
produce a full crop the following season. Two varieties, however, are
more commonly sown alone. These are alfalfa and crimson clover.

Alfalfa is more commonly sown alone because the young plants are
somewhat delicate and easily crowded out by other plants amid which they
are growing. Because of the several years during which alfalfa will
produce crops when once established, it is deemed proper to sacrifice a
nurse crop in order to get a good stand of the young plants. The other
clovers are usually able to make a sufficient stand, though grown along
with a nurse crop. In some situations alfalfa will also do similarly,
as, for instance, where the conditions are very f