Great-plains 2510HDF Material Rate User Manual download pdf (Page 7)

Great Plains Manufacturing, Inc. Main Box Seed Rate 5

10/19/2010 288-340B

Main Box Calibration

Refer to sample data and formulas at right.

1. As necessary, convert your target seed population to

pounds per acre.

2. Set Drive Type, rate handle and seed cup door per

the earlier instructions.

3. Record weight of an empty container large enough

to hold seed metered for one acre for three rows.

4. Place several pounds of seed over three seed cups

on an outside end of a drill box. Pull seed tubes off of

these three openers and route them to container.

5. Raise the drill.

6. Rotate gauge wheel or calibration crank a few turns

to conﬁrm gearbox has engaged and to conﬁrm that

the seed paths are free from foreign matter.

7. Turn gauge wheel several times to ﬁll seed cups with

seed. Turn wheel until seed falls from each cup.

Place seed collected so far back in the box.

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. When turning the

gauge wheel jackshaft, count tire rotations, as the

axle and jackshaft sprockets are not 1:1.

9. Check that the three seed cups have ample seed

coming into them.

10. Weigh metered seed.

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 seeded per acre.

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

rate adjustment handle accordingly.

Note: You may want to repeat the calibration procedure if

your results vary greatly from seed rate chart.

When drilling, check seeding rate by noting acres drilled,

amount of seed added to drill and seed level in drill box.

If you are seeding more or less than desired, adjust

seeding rate slightly to compensate for ﬁeld conditions.

For example:

Drill: 2510HDF-2910

Seed: Soybeans, 80,000 seed bag weight: 35 pounds

Target population: 210,000 seeds per acre

80000

÷ 35 = 2286 seeds per pound

210000 ÷ 2286 = 92 pounds per acre

Drive Type: 3

Rate Handle: between 50 and 55, approximately 51

Assume empty ContainerWeight of:

2.5 pounds

From table, rotations per acre is:

214

For a 25-foot drill, tire rpm for 5 mph is:

Assume container plus seed weighs:

12.6 pounds

SeedWeight:

12.6 - 2.5 = 10.1

PoundsPerCup:

10.1 ÷ 3 = 3.36

PoundsPerAcre:

3.36 x 29 = 97.5

Target was 92. Result is 6% high.

Adjust handle down by 3 (6% of 51)

to a Seed Rate Handle setting of:

SeedWeight TotalWeight ContainerWeight–=

PoundsPerCup

SeedWeight

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

PoundsPerAcre PoundsPerCup OpenerCount×=

1 2 3 4 5 6 7 8 9 10 11 12 ... 25 26

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Great-plains 2510HDF Material Rate User Manual Page 7

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