White Bluffs spokesman. [volume] (White Bluffs, Wash.) 1907-1938, 1931-03-05
ONE HUNDRED TWENTY
POUNDS PER ACRE SEW
ENTY-FOUR OR TWEEN
TY-FOUR CENTS?

is in charge of the soils and fertilizer
tests at the Irrigation Branch Station
at Prosser, they have found that ap-
proximately 100 pounds of nitrogen
per acre has given the most econom-
zeal results with practically all crops
experimental with to date. This in
cludes work on grains, potatoes and
a few other truck crops.
Ones fertilizer program we think,
should be based upon this general
statement In getting at the amount
Of Commercial fertilizer which one
could apply it is necessary to take in
to account the amount of nitrogen
which may have added through other
sources. One can figure roughly that
ZACH ton of manure will add ten
pounds of nitrogen, and that good
Italia crop would add 200 pounds of
nitrogen. In neither the manure or a
Equine crop turned under would this
nitrogen be as available for plants
IS it wo-l} in the commercial form
ah as in the ammonium sulphate or
-yanarnid Or even the anmophes fer
ilizers. 1t is probable that the nitro
gen would spread out over even two
years or three years time when turn
ID under as manure or cover crop,
while in the commercial forms given
Dove it would be all available with
n the one season. Because Of this
act it may be possible that even
where one has used large amount
If manure or turned down a heavy
a %1o+ 81
iition of some nitrogen in the form
Of commercial fertilizer would ma
:erially help even the first year. We
znow that at least the addition of a
reasonable amount of nitrogen to a
heavy cover crop and to rnanures will
help in getting the best results from
those forms of fertilizer, and conse-
quently the addition of 100 to $50
pounds per acre of ammonium sui
phate, cyanan1id or better yet, Ammo
ohos B, to manure or cover crop
should be excellent practice and this
should give good economical returns.
In determining the amount of nitro
gen to add in addition to this amount
applied with the cover crop of mas
nure one would need to check the
amount of manure applied or the
amount of alfalfa or sweet cover ac-
tually turned down. The use of 100
to 800 pounds of amonium sulphate
or like fertilizer per acre on narrow
strip and checking of results should be
she best method of determining
whether our soils need more nitrogen
than they may be already getting.
This strip should be comparative1v
narrow one.
II one is depending upon the Com
nercial fertilizer alone, one can readily.
see that it would take large amounts
of fertilizer such as a 3-10-7 or 5-6-8
20 furnish the 100 pounds of nitrogen.
At the Young Farmers Conference
aeld at Yakima last week it was point
ed out that in order to provide Is
10 20 year old apple tree with one
pound of nitrogen it would require
80 1-3 lib. of 3-1O-7 fertilizer and this
At a cost of 74c per tree as the pre-
sent cost to the grower. The same
nitrogen could be added with pounds
of ammophos A and pounds of am
nonium sulphate or cyanarnid and
this would provide sufficient phos
plate to take care of the need of
tree for least one year, the cost
being but 24c per tree with but seven
pounds Of fertilizer to apply the freight
on as against 80 Of the other. This,
If figured on the acre basis, would
represent saving of $4,000 to $780,,
which we believe is an item we'll
worth considering at this time.
E. c. DURDLE,