Great Plains 2525P Material Rate - Manual (Page 67)

10/19/2010 118-960B
Great Plains Mfg., Inc. 67
8. Rotate gauge wheel until one acre has been tallied
(see table on page 63). Simulate field speed.
Note: You can also rotate the gauge wheel jackshaft by
means of a wrench or socket, on the drill side that
does not have the acremeter. If turning the gauge
wheel jackshaft, count tire rotations, as the axle
and jackshaft sprockets are not 1:1.
9. Check that the three fertilizer drop tubes have ample
fertilizer coming into them.
10. Weigh metered fertilizer.
11. Subtract initial weight of container (tare weight).
12. Divide by three.
13. Multiply by the number of openers on your drill to de-
termine total pounds applied per acre.
14. If this figure is different than desired, set your fertilizer
rate adjuster accordingly.
Note: You may want to repeat the calibration procedure if
your results vary greatly from the rate chart.
When drilling, check material rate by noting acres drilled,
amount of material added to drill and material level in drill
box. If you are applying more or less than desired, adjust
rate slightly to compensate for field conditions.
FertilizerWeight TotalWeight ContainerWeight – =
PoundsPerDropTube
FertilizerWeight
3
-------------------------------------------- =
PoundsPerAcre PoundsPerDropTube OpenerCount ×
=
From table, rotations per acre is:
268
For a 20-foot drill, tire rpm for 5 mph is:
66
Assume container plus material weighs:
7.3 pounds
FertilizerWeight:
7.3 - 1.1 = 6.2
PoundsPerDropTube:
6.2
÷ 3 = 2.1
PoundsPerAcre:
2.1 x 24 = 49.6
Actual Target was 60 pounds per acre.
Result is 17% low.
Change adjuster up by 8.5 (17% of 50)
to a Fertilizer Rate Adjuster setting of:
59
Fertilizer Rate Chart
Rates in Pounds per Acre
Density Conversion Chart
The fertilizer meter rate charts are based on fertilizer with
a density of 65 pounds per cubic foot (1.04 kilograms per
liter). If you are applying fertilizer of a different density,
use the following table to convert application rate.
Density, lb/ft 3 45.0 50.0 55.0 60.0 65.0 70.0 75.0 80.0
Conversion Factor 1.45 1.30 1.20 1.10 1.00 0.93 0.87 0.81
Fertilizer Rate Handle Scale Setting Chart: f1c
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
Rows Fertilizer Rate in Pounds per Acre
7.5 in 0 0 7 11 20 38 54 72 89 105 123 138 157 174 187 209 223 234 242 245 247
10 in 0 0 5 8 16 29 40 54 67 79 92 104 118 131 140 157 167 175 182 183 185