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4-20 FERTILIZER – RATE CALIBRATION
4-20.1
Dry fertilizer can be affected by type,
density, size, humidity, and field conditions.
Operator should verify actual fertilizer rate
output before planting.
4-20.2
To check the fertilizer rate:
a. With a desired fertilizer rate and known den-
sity apply the above conversion factor and se-
lect rate from chart. If density is not known,
use desired rate based on 65 lbs/ft
chart.
b. Adjust the sprocket ratio to the desired rate.
c. Select three fertilizer meters next to each
other and disconnect the rubber tubes from
these meters to be able to collect fertilizer.
d. Fill the fertilizer box with a sufficient amount
of fertilizer over the top of the three meters.
e. Lower the openers so the drive wheel clutch
will engage.
f. Place a jack under the appropriate drive
wheel and raise off the ground so the drive
wheel may be rotated by hand.
g. Rotate the drive wheel several times, until
the three meters begin to deliver fertilizer
evenly.
h. With an empty container begin collecting the
fertilizer from the three meters as you rotate
the drive wheel by hand. Count the total num-
ber of rotations. Twenty rotations would be a
good starting point; more rotations will pro-
3
duce more accurate results.
from the
i.
izer (less the container) and divide by 3 for an
average amount of fertilizer per meter.
FERTILIZER RATE = __(AVG FERTILIZER WT) X 65896__
4-20.3
the starting rate and compensate for any
variation. Repeat the calibration until the de-
sired fertilizer rate is achieved. Adjust the
sprocket ratios on the other sections to
match the calibrated setting.
4-20.4
while planting. Note the amount of acres
planted versus the amount of fertilizer added
to the drill. If you are applying more or less
fertilizer than desired, adjust the metering
rate to compensate for field conditions and
fertilizer.
Weigh (in pounds) the total amount of fertil-
(NO. OF ROTATIONS) X (ROW SPACING)
Compare the actual fertilizer rate with
Continue to monitor the fertilizer rate
4-27
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