20
Basic Calibration Procedure (Continued)
Hand Crank Turns for Seed Rate Calibration
The tables represented below are for arable conditions (worked ground) and
are calculated to indicate an average situation. If there is any doubt as to the
accuracy of these figures for the conditions, it is advisable to run checks on
the calibration figures listed. Refer Page 22, (Wheel Slip Deviations).
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. If the
resultant calculation does not produce the desired seed rate use the enclosed
seed rate calculator disc to determine the correct gearbox setting.
Refer Use of Seed Rate Calculator Page 21.
Suggestion: To be on the safe side and until confidence has been gained
with the method of calibration it is advisable to conduct a second test at the
newly determined gearbox setting.
11 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.
For
1
/
40
Hectare (250m
2
) Calibration
Seed Rate = Actual Seed Collected (kg) x 40
For
1
/
10
Hectare (1000m
2
) Calibration
Seed Rate = Actual Seed Collected (kg) x 10
Machine
Size
Row
Spacing(mm)
Sowing Width
(m)
Turns for 1/40
Hectare
Turns for 1/10
Hectare
14 Run 148.5 2.079 29 114
16 Run 148.5 2.376 25 100
18 Run 148.5 2.673 22 89
To Next Page
Loading...