18
Hand Crank Turns for Seed Rate Calibration
9 Weigh the seed collected during the test in kilograms.
Caution: Scales must be accurate to 2 grams, as any error will be multiplied
by either 10 or 40, giving inaccurate calibration results.
10 Calculate the seed rate by multiplying the kgs previously collected x 40 (1/40th
ha method) or x 10 (1/10th ha method) depending on the requirement.
The seed rate should be correct. Large differences should be checked by
recalibration. If there are still large errors, empty the seed bin, check the
metering housings for wear or damage and start again from the pre-calibration
setup.
11 Small errors, due to seed coatings or seed sizes can be corrected by adjusting
the metering unit as follows:-
>Check and write down the actual metering setting on the metering unit.
>Write down the actual seeding rate that you calculated.
>Write down the required seeding rate (the number you expected from the
calculation).
Calculate the error and correction as follows:-
12 If the actual seeding rate that you calculated is smaller than the required
seeding rate then increase the metering setting by the correction amount.
13 Conversely, reduce the metering setting by the correction amount if the
observed or actual seeding rate is more than the required seeding rate.
Care must be taken when the metering setting is significantly reduced as
the unit can be damaged. If any resistance is felt, rotate the jockey wheel
when adjusting the settings down. If the toggle is set to ‘fine’ and the
settings needs to be reduced very low, empty the bin and start again.
14 Recalibrate from step 6.
15 Where a coated seed is used it is advisable to check the calibration after
1 hectare as dressings can tend to create a coating on the seed metering
wheels thus changing the the flowing properties of the seed which in turn
alters the seed rate.
‘Enviro DD30’ Calibration
Machine
Size
Row
Spacing(mm)
Sowing
Width (m)
Turns
for 1/40
Hectare
Turns
for 1/10
Hectare
23 Run 125 2.875 32 128
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