The River Falls times. [volume] (River Falls, Pierce County, Wis.) 1894-1933, 1899-02-21
FOR Spraying Potatoes.

The Cornell University gives the fol-
lowing advice:
Directions for making Bordeaux
NEUTRALITY-SUSPICIOUS. were given in
Bulletin 14O for making Bordeaux
mixture We have found that the fer
rocyanide of potassium test is much
simpler, and so the following diree-
tons are given:
Into barrel of water suspend a
gunny sack or other porous bag, con-
tanning two pounds OF copper sulphate
for every gallon of water in the bar
rel. If this is suspended near the sur
face Of the water at night it will all
be in solution by morning and ready
for use Into water-tight box or
other open receptacle place some fresh
burned caustic lime, the amount to be
determined somewhat by the amount
of spraying to be done, but from 40 to
so pounds of lime can be easily slaked
at one time. Add sufficient water to
thoroughly Stake all the lime and keep
well stirred SO that the water may
come in contact with all particles.
This thorough stirring is important,
and the lime should be carefully
watched and stirred for several min
utes, or otherwise it is likely to be-
come dry and hard. After the lime is
all slaked, cover it over with water
and it is then ready for use and may
be kept for any length of time desired
if it is always kept covered with
water Ferrocyanide of potassium may
hn
comes as a solid. One ounce of ferro-
cyanide of potassium dissolved in one
ounce of water will be sufficient for
testing many barrels of the Bordeaux
mixture. When it is desired to begin
spraying there should be provided two
empty barrels. Into one barrel dip
three gallons OF the copper sulphate
stirred. This will provide the six
pounds of copper sulphate in case two
pounds were dissolved per gallon of
water, and will be sufficient for MAX
ing one barrel, or IS gallons of Bor-
deaux mixture. Dilute the three gall
Ions with ten or more gallons of water.
From the lime box dip from five to
empty barrel Add water and stir
thoroughly until the milk of lime is
produced, after which dilute with some
ten gallons more of water. Pour the
milk of lime thus diluted through d
sieve into the dilute copper sulphate
solution. The quantity of lime to be
added to the copper sulphate is to be
determined by the ferrocyanide of
potassium test. After adding a small
amount of the milk of lime to the cop
per sulphate solution, add to the mix
ture a drop of ferrocyanide of potas-
SUM. If brick red color is produced
where the drop strikes, it indicates
that more lime is needed. Continue
adding the milk of lime until no red
dish color will be produced when the
ferrocyanide of potassium is used. A
few trials will enable one to judge
very accurately as to the amount of
lime required. A little surplus lime
will do no harm.
If Paris green is to be used it should
now be added. Take ounces of Paris
green and place it in a dish and add
water just sufficient to make paste,
and stir thoroughly until a homogen-
eous mixture is formed. Pour this
paste into the mixture of lime and
copper sulphate, and stir vigorously.
Pour the lime and copper sulphate
mixture into the spray barrel, which
should have capacity of As to so gal
lons and fill the barrel with water. If
there is no agitator in connection with
the pump, the mixture should be FREE
nuently stirred while being applied.