e months and four days after the seeds were
sown. The clovers were then weighed and tested and the following
results were obtained:

----------------+----------------------------------------------
| NITROGEN IN AN ACRE OF CLOVERS.
+---------------+----------------+-------------
| Lbs. in tops. | Lbs. in roots. | Lbs., total.
----------------+---------------+----------------+-------------
Crimson Clover | 125.28 | 30.66 | 155.94
Mammoth Clover | 67.57 | 78.39 | 145.96
Red Clover | 63.11 | 40.25 | 103.36
----------------+---------------+----------------+-------------

A large part of the nitrogen found in these plants was undoubtedly
taken by the roots from the soil air.

Besides adding humus and nitrogen to the soil the legumes, being
mostly deep-rooted plants, are able to take from the subsoil food
which is out of reach of other plants. This food is distributed
throughout the plant and when the plant is plowed under the food is
deposited in the upper soil for the use of shallow-rooted plants.

BENEFITS

The benefits derived from green crop manuring then are as follows:

We add to the soil organic matter or humus which is so helpful in
bringing about the conditions necessary for root growth.

By using the legumes for our green manure crops we may supply the soil
with nitrogen taken from the air.

We return to the surface soil not only the plant food taken from it
but also plant food brought from the subsoil by the roots of the green
manure plants.

CHARACTER OF BEST PLANTS FOR GREEN CROP MANURING

The plants best adapted to green crop manuring are deep-rooted,
heavy-foliaged plants. Of these the legumes are by far the best, as
they collect the free nitrogen from the air which other plants cannot
do. This enables the farmer to grow nitrogen which is very expensive
to buy.

THE TIME FOR GROWING GREEN MANURE CROPS

Green manure crops may be grown at any time that the soil is not
occupied by other crops, provided other conditions are suitable. Land
which is used for spring and summer crops often lies bare and idle
during fall and winter. A hardy green manure crop planted after the
summer crop is harvested will make considerable growth during the fall
and early spring, and this can be plowed under for the use of the
following summer crops. If there is a long interval of time during
sprin