The watchman and southron. [volume] (Sumter, S.C.) 1881-1930, 1922-03-22
FERTILIZER
EXPERIMENTS
New Experiment Station Bull
letin Covers Six Years
Tests at Pee Dee Station,
Florence

Clemson College, March IL
Experiment Station Bulletin 2o9,
Fertilizer Experiments" has been
issued by the South Carolina i1X-
pertinent Station giving results Of
fertilizer experiments at the Pee
Dee Station. Florence. S. c., from
1914 10 1919 inclusive. The b"l-
letin, prepared by G.. p. Blackwell.
asronOnlist, and T. S. Huie. assist
ant asronemist. is 4 somewhat
technical publication Of results Of
work begun in 1914 under Prof.
T. T. Keitt and continued ander
Prof. G =. blackwell. and con-
sistS largely Of tables and graphs
recording experimental results Of
various kinds and amounts Of fer
tihzers when used in rotation and
otherwise on cotton, corn, oats, etc.
The principal features Of the
bulletin are thirty-seven tables and
fifty-onc graphic figures recording
and illustrating results. These are
accompanied by brief explanatory
discussions and followed by a brief
summary OF conclusions. These
conclusions are given below for the
benefit OF farmers. manH of whom
would not care TO make n close
study of the mass Of tabular and
graphic matter in the bulletin.
Summary.
]. Acid phosphate, ground rock
phosphate, and Thomas phosphate
gave equally good yields when ap-
piled at the rates used in this ex-
pertinent and on this particular soil
and in the abscEce OF the boil wee
vii.
. Acid phosphate gave an earl
ier crop of cotton than either
ground rock phosphate or Thomas
phosphate.
3. Eight percent Of acid phos-
phate in a l06o-peund application
OF fertilizer gave the maximum
yield Of cotton and larger appli-
cations were not profitable. Four
percent was not as good as eigit
for cotton.
4. Corn and cowpeas when
grown ina rotation witt, cotton did
not respond to applications OF phos-
phoric acid. Oats gave q small in
crease for four percent of acid but
not for larger amounts.
5. Blood alone, as source Of
ammonia. gave better results than
a mixture OF one-third blood an>.
1wo-thsrds. cottonseed meal.
/. G.. Four percent of ammonia
was better than either larger or
smaller applications for cotton
continuously and for cotton in ro-
ration 80 ~
{. The yields of corn and oats
we're in direct proportion to the
amount of ammonia applied; but
the yield of cowpea hay was not
Influenced by the application Of
ammonia.
9. The time of application OF
soda as. a side dressing made no
difference in the yields of any crops
in this particular experiment, be-
cause the soil had sufficient am
monia for maximum yield OF these
crops without the side dressing
8. Two percent of potash was
sufficient for maximum yield CT
corton in rotation. and four per-
cent was best where cotton was
grown continuously.
|. TO. Corn, oats. and peas gave
40 response 10 applications OF pot
ash in this experiment.
II. Muriate and kainit we're Of
equal valne as sources of potash in
This experiment for al crops used.
-. Caustic lime and ground
; limestone were OF equal value as
sources of lime when used ut the
rates Of of 1000 pounds and .
1900 pounds respectively.
Ia. Line was not profitable to
use on this soil for any Of the crops
grown.
IL. AT the end of six years the
citation series was yielding ap-
proXimately twice as much as the
continuous cotton series and was
gaining rapidly even where COM
plcre fertilizer was used At the
rate % ,ado pounds pea acre. thus
showing the superiority OF Il rota-
ton over = continuous cotton for
maintaining the fertility of the
land.
IL. Either very heavy On very
light application Of ammonia de-
lays the maturity OF cotton. Heavy
applications OF potash also delay
! maturity
IL. The earlics; crop OF cotton
was secured by q reasonable appii-
cation of acid phosphate and am
lnouia. and from a woli-b:llanccd
complete fertilizer, which docs not
run high in any one clement.
-G@
Report Of the Secretary For Febrn-
airy.
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