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Canola Drill Calibration Worksheet
Date:
Producer:
Drill ID:
1. Determine drive wheel circumference (feet)
- Measure height (inches) of tire and multiply by 3.14 and then divide by 12
Ex. 30inches X 3.14 = 94.2
94.2 / 12 = 7.85 feet in circumference
- Or just measure around tire in inches and divide by 12 if wheel is off the ground
A:
2. Determine how many drive wheel revolutions it will take to reach 100 feet
- Divide 100 by figure "A"
Ex. 100 / 7.85 = 12.74 wheel revolutions per 100 feet
B:
3. Determine how many mL of seed needs to be caught for 1 row or 4 rows
- It is recommended to take several samples from each section of the drill
- Taking 4 row samples from each box section is preferred
- Row samples can either be individually measured ("C")
Chart 1.
or 4 row samples can be collectively measured ("C4")
- Chart 1. shows how many milliliters (mL) should be caught
in 100 feet for 1 row or 4 rows added together.
- Chart 1. is calculated for a 5lb/A seeding rate.
- From this point forward, either use "C", "D", and "E"
or "C4", "D4", and "E4" for the calibration procedure.
C:
C4:
Row
Spacing
6
7
7.5
8
10
15
1 row
("C")
3.6
4.2
4.6
5.0
6.2
9.3
4 rows
("C4")
14.4
16.8
18.6
20.0
24.8
37.2
4. Collection of row samples during calibration
D:
- For box grain drills with more than 1 section collect from one section at a time
D4:
- Turn drive wheel enough to prime all seed cups and mark tire for counting revolutions
- Secure bags on seed cups, rotate drive wheel "B" times, measure samples, and record values
Run
1
2
3
4
5
6
7
8
9
mL Collected from each row
Row 1 Row 2 Row 3
Row 4
Avg. "D"
mL from 4 rows
Run Total mL ("D4")
1
2
3
4
5
6
7
8
9
"E"
"E4"
5. Determining estimated seeding rate from mL caught per row or 4 rows
Single Row Calculation ("E")
"D" X 5
"C"
=
lbs/acre
4 Row Calculation ("E4")
"D4" X 5
"C4"
=
lbs/acre