Great Plains V-300F Operator Manual - Manual (Page 86)

82 V300 & V300F Great Plains Manufacturing, Inc.
148-057M-A 11/15/2007
Small Seeds Rate Calibration
The V300 and V300F small seeds attachment does not
have a diverter to the calibration tray. Calibration is per-
formed by sampling at three seed tubes.
The spring scale included with the drill is unlikely to be
able to accurately read the weight of small seed calibra-
tion samples of practical size. Likewise, the supplied cali-
bration bag may be too heavy relative to sample sizes. A
scale with gram or ounce precision, and small lightweight
containers are needed.
Note: You may need to increase seed cup setting for
lighter than average seed or decrease seed cup
setting for heavier than average seed.
Note: The seed rate charts are based on cleaned,
untreated seed of average size and test weight.
For seed not listed on the charts, compare weight
and size to those listed and use a similar setting.
Refer to formulas in instructions and sample data at right.
1.
Consult the rate chart for your seed.
2. Set rate handle per the earlier instructions.
3. Record weight of one or more small empty contain-
ers with sufficient capacity to hold seed metered for
one tenth hectare or acre for three rows.
4. Place several kg or pounds of seed over three seed
cups on an outside end of a drill box. Pull seed tubes
off of these three, at the openers, and route the
tubes to the container(s).
5. Raise the drill.
6. Rotate gauge wheel or calibration crank a few turns
to confirm drivetrain is operating 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 tenth hectare or one
tenth acre has been tallied (see table on page 74).
Simulate field speed.
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 ten.
14. Multiply by the number of openers (17) on your drill
to determine total pounds seeded per acre.
Example:
Seed: Millet
Target population: 9 kg/hectare
Expected planting speed: 7 kph
Rate Handle from chart:
between 50 and 55, approximately: 52
Assume 3 plastic jars, each 14.2 grams.
ContainerWeight of: 3 x 14.2 = 42.6 gr (0.0426 kg)
From table, rotations per tenth hectare is: 320
Tire rpm for 7 kph is: 112 rpm
Sample in containers weighs: 192.1 grams
TotalWeight = 0.1921 kg
SeedWeight: (kg)
0.1921 - 0.0426 = 0.1495 kg
WeightPerCup:
0.1495
÷ 3 = 0.04983 kg
CupPerArea:
0.04983 x 10 = 0.4983 kg
CurrentRate:
0.4983 x 17 = 8.47 kg/Ha
SeedWeight TotalWeight ContainerWeight – =
WeightPerCup
SeedWeight
3
----------------------------- =
CupPerArea WeightPerCup
10 ×
=
CurrentRate CupPerArea OpenerCount Ч =