Medium Red Clover (Trifolium pratense) is also known by the names
Common Red Clover, Broad-Leaved Clover and Meadow Trefoil. The term
medium has doubtless come to be applied to it because the plants are in
size intermediate between the Mammoth variety (Trifolium magnum)
and
the smaller varieties, as the Alsike (Trifolium hybridum) and the
small white (Trifolium repens). But by no designation is it so
frequently referred to as that of Red Clover.
This plant is spreading and upright in its habit of growth. Several
branches rise up from the crown of each plant, and these in turn
frequently become branched more or less in their upward growth. The
heads which produce the flowers are nearly globular in shape, inclining
to ovate, and average about one inch in diameter. Each plant contains
several heads, and frequently a large number when the growth is not too
crowded. When in full flower these are of a beautiful purple crimson,
hence, a field of luxuriant red clover is beautiful to look upon. The
stems of the plants are slightly hairy, and ordinarily they stand at
least fairly erect and reach the height of about one foot or more; but
when the growth is rank, they will grow much higher, even as high as 4
feet in some instances, but when they grow much higher than the average
given, the crop usually lodges. The leaves are numerous, and many of
them have very frequently, if not, indeed, always, a whitish mark in the
center, resembling a horseshoe. The tap roots go down deeply into the
soil. Usually they penetrate the same to about 2 feet, but in some
instances, as when subsoils are open and well stored with accessible
food, they go down to the depth of 5 or 6 feet. The tap roots are
numerously branched, and the branches extend in all directions. When
they are short, as they must needs be in very stiff subsoils and on thin
land underlaid with hard soil, the branches become about as large as the
tap roots. It has been computed that the weight of the roots in the soil
is about equal to the weight of the stem and leaves.
Medium red clover is ordinarily biennial in its habit of growth, but
under some conditions it is perennial. Usually in much of the
Mississippi basin it is biennial, especially on prairie soils. On the
clay loam soils of Ontario, Ohio, Michigan, Wisconsin, Indiana and some
other States, it is essentially biennial, but many of the plants will
survive for a longer period. In the mountain valleys in the Northwestern
States, and on the Pacific slope west of the Cascade Mountains, it is
perennial. Medium red clover meadows in these have been cut for several
successive years without re-seeding the crop. The duration of this plant
is also more or less influenced by pasturing as compared with cutting
for seed. Grazing the plants has the effect of prolonging the period of
their growth, while maturing seed from them has the opposite effect.
Medium red clover is characterized by a rapid growth. Seed sown in the
spring has in certain climates produced a crop of hay in 120 days from
the date of sowing. It is also most persistent in its growth from spring
until fall when sufficient moisture is present. In this property it far
outranks any of the other varieties of clover. It comes into bloom in
the South during the latter half of May and in the North during the
month of June, early or later, according to location, and in about sixty
days from the time that it is cut for hay. Ordinarily, a second cutting
of hay may be taken from it and still later some pasture.
It furnishes excellent pasture, soiling food and hay for nearly all
classes of live stock. While it is much relished by the stock, it is
probably not exceeded in its capacity for quick and prolonged growth
throughout the growing season by any pasture plant, except alfalfa. For
a similar reason it stands high as a soiling food. No other variety of
clover grown in America will furnish as much of either pasture or
soiling food. For animals producing milk and for young animals, the
pasture is particularly excellent. It is also the standard pasture for
swine where it can be grown, and where alfalfa is not a staple crop.
When the hay is well cured, it makes a ration in even balance for cattle
and sheep, and for horses it is equally good. The prejudice which exists
in some quarters against feeding it to horses has arisen, in part, at
least, from feeding it when improperly harvested, when over-ripe, when
damaged by rain, or by overcuring in the sun, or when it may have been
stored so green as to induce molding. It may also be fed with much
advantage to brood sows and other swine in winter.
As a soil improver, medium red clover is probably without a rival,
unless it be in mammoth clover, and in one respect it exceeds the
mammoth variety; that is, in the more prolonged season, during which it
may be plowed under as a green manure. Its quick growth peculiarly
adapts it to soil enrichment. For this reason, it is more sown than any
of the other varieties in the spring of the year, along with the small
cereal grains to be plowed under in the late autumn or in the following
spring, after the clover has made a vigorous start, since it produces
two crops in one season, the first crop may be harvested and the second
plowed under after having made a full growth. This can be said of no
other variety of clover. More enrichment is also obtained from the
falling of the leaves when two crops are grown than from the other
varieties.
The influence of this plant on weed destruction when grown for hay is
greater than with the other varieties of clover. This is owing in part
to the shade resulting from its rapid growth and in part to the two
cuttings which are usually made of the crop. These two cuttings prevent
the maturing of the seeds in nearly all annual weeds, and to a very
great extent in all classes of biennials. The power of this crop to
smother out perennials is also considerable, and when this is linked
with the weakening caused by the two cuttings, it sometimes proves
effective in completely eradicating for the time being this class of
weeds.
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