Great-plains 2510HDF Material Rate User Manual download pdf (Page 19)

Great Plains Manufacturing, Inc. Fertilizer Rate 17

10/19/2010 288-340B

8. Rotate gauge wheel until one acre has been tallied

(see table on page 2). 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

determine total pounds applied per acre.

14. If this ﬁgure is different than desired, set your fertil-

izer 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.

Fertilizer Rate Chart

Metric chart is on page 24.

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

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

From table, rotations per acre is:

268

For a 20-foot drill, tire rpm for 5 mph is:

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:

FertilizerWeight TotalWeight ContainerWeight–=

PoundsPerDropTube

FertilizerWeight

-----------------------------------------

PoundsPerAcre PoundsPerDropTube OpenerCount×=

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

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 25 26

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Great-plains 2510HDF Material Rate User Manual Page 19

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