lso the disadvantage to all three methods
of sowing by hand, that it is frequently necessary to provide a covering
for the seed by subsequently using the harrow.

The advantages from sowing with the seeder attachment to the grain drill
are that the seed may be made to fall before or behind the tubes as may
be desired, or it may be sown with the seed along with the grain, and
that when sown by any of these methods there is much saving of time as
compared with sowing by hand. In some sections of the prairie the seed
is sown with the grain drill by driving the same across the newly sown
grain rows. If necessary to insure sufficiently thin sowing, the seed
should be first mixed with some substance such as common salt.

In the moist areas of the upper Atlantic coast, Ontario and the Puget
Sound region, the seed is frequently made to fall behind the grain tubes
on clay and clay loam soils, and is covered by running the roller over
the ground subsequently; but in States more inland the seed is usually
made to fall before the drill tubes, when, in some instances, the sowing
of the grain will provide a sufficient covering; but in others the
harrow is used in addition, and sometimes both the harrow and the
roller. When clover seed is sown along with grain and by the same tubes,
it will in some soils be buried too deeply, but in others the objection
does not hold good. The young plants are also injured more by shade from
the grain, since they grow only in the line of the row along with the
grain, and yet this method of sowing clover seed in some localities
seems to answer reasonably well.

When the broadcast seeder is used in sowing clover seed, time is also
saved as compared with hand sowing, but the seed can only fall before
the seeder, and must, therefore, be given the same covering as the
grain, as, when the seed is sown with the grain drill, it will in some
instances be buried too deeply. In other instances it is not so.

The depth to which the seed of medium and other clovers ought to be
buried should vary with soil and climatic conditions, and with the
season of sowing. The more stiff the soil, the more moist the climate,
and the earlier that the seed is sown, the less the covering required,
and _vice versa_. As has been shown, under certain conditions (see page
22), early sown clover seed does not require any covering artificially
given, and sometimes when sown later, a reasonably copious rain will
provide sufficient co