Atlanta tri-weekly journal. [volume] (Atlanta, Ga.) 1920-19??, 1921-02-26
AGRICULTURAL EDUCATION
~ DR.. ANDREW M. SOULE

east. Nevertheless many of our
farmers are inclined to use the
ground rock Phosphate because of its
lever cost thar the acid phosphate.
We do not think their conclusion is
| founied always on a correct scien-
tain that acid phosphate will give
more immediate results when applied
to most Georgia soils than tho rock
Phosphate. Acid phosphate, of
| course. conta ms considerable sui
pkLr. which the ground rock phos-
| phott lacks. We have already point
ed out the advantage to be derived
from sulphur when used in associa-
| ton with leguminous crops. II
| ground rock phosphate Is to dis
pace acid phosphate there is no
doubt but that some advantage will
| often occur to the land owner who
uses gypsum to balance UP his soil
| and supply such sulphur and other
| elements as may be needed. phos-
| phorous and sulphur are two ele-
ments in which most soils are APP
is but few years supply of either
present in many of our best known
and most extensively cultivated land
| areas. This condition being true it
is important to bear these facts in
mind and be certain to see that our
soils contain a sufficient amount OF
food supply in proper equilibrium and
insure the production Of maximum
crops at a minimum outlay.
In this connection remember that
this is but a suggestive story about
gypsum, it's relation to our agri-
of the benefits it may confer on
crops when used under rational
and wise system of farm manage
ment: 1t is not panacea for many
of the ills which may affect the
soil or may be holding down, yields
tivation of the land Improbable.
This material contains certain plant
food elements which are often de-
ficient in the soil and which it is
likely therefore, to be an advantage
to supply. This material simply
to the land. 1t aids in the release
OF certain plant food elements, 1t
is valuable in preventing the loss
of ammonia from manures. 1t aids
in deodorizing the stables and keep
| ing them in a sanitary condition. 1t
growth of leguminous crops, and it
may often be used with advantage
on certain garden crops as well.
Velvet Bean Meal as a Fertilizer
B. F. NJ, Sandersville, Ca,
ue of velvet bean meal as fer
| t1l1zer compared with cotton
| seed meal. Will it act as quick
| " as cotton seed meal? Is it
best to grind with the hull or
after the beans have been
threshold?
A ton of velvetbean meal from
which the bulls have been excluded
contains approximately so pounds
nitrogen, 20 pounds phosphoric acid,
81 pounds potash. If the hulls have
| been ground in with the meal a ton
| OF this material would contain about
81 pounds nitrogen, 16 pounds phos-
phor1c acid, and "a pounds of pot
ash. You will thus see that by
grinding the hulls with the beans YOU
reduce the nitrogen content about
| 70 pounds. The phosphoric acid is
also reduced slightly, while the pot
ash remains practically unchanged
L would handle the beans in which
ever manner would be most econom-
pc to grind them with the hulls
1t simply means that in securing
the approximate amount of nitrogen
yau need to apply little more ma
terlal If the hulls have been in
cluded in the grinding process.
Cottonseed meal of a good grade
as you doubtless know, contains a
good deal more nitrogen, phosphoric
acid, and potash than velvet bean
meal. Good meal, for instance, con-
| the approximate amount of nitrogen
per ton, SO pounds phosphoric acid
and 36 pounds of potash: High
er grades of meal than this contain
a little more nitrogen, but there is
relatively little difference in the
content of phosphoric acid and pot
ash. You will see therefore that
a ton of cottonseed meal contains a
/ little more potash than velvet bean
meal with or without the hulls. A
ton of cottonseed meal contains
about 2.5 to 3 times as much phos-
phoric acid and one-third to one-half
more nitrogen.
In SO far as the availability of the
plant food is concerned we do not
believe there would be any material
difference shown. In other words
we would not hesitate to use velvet
| beans as carriers of plant food p
beans as carriers of plant food as
compared with cottonseed meal
Most of the prices on these goods
that have come to our attention
| have, however indicated that cotton
seed meal is a cheaper carrier OF
| nitrogen and other elements than
| velvet beans under existing condi.
! tions.
Cheaper Source of Nitrogen