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As 1910 Commodity Air Carts meter seed, a handle turns on the left-hand side of the machine. This handle turns a certain number of turns per hectare. The number of turns is different for every cart. There can be up to 1300 turns per hectare, so the following calculation shows how to figure the number of turns for
1/10 hectare
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IMPORTANT:
Metering accuracy is directly related to the amount of product metered out. At least 5 kg of metered product is required to accurately use this method.
For example, 1/10 of a hectare of canola is only about 0.5 kg. This cannot be weighed accurately with the scale provided so this method should not be used with this product.
1.
Calculate wheel turns for 1/10 ha.
FORMULA:
Number of Wheel Turns for 1/10 ha = 1000 ÷ Seeding Tool Width (m) ÷ Drive Tire Circumference (m)
EXAMPLE:
1910 cart with 9.14 m seeding tool and 28L x 26 R3 tires. Tire circumference from the Drive Tire Chart is 4.775 m.
Wheel turns for 1/10 ha = 1000 ÷ 9.14 m ÷ 4.775 m or 22.9 turns per 1/10 ha.
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| Drive Tire Chart |
| Tire Size |
Tire Circumference (m/rev) |
| 18.4-26 R3, 10PR |
4.191 |
| 18.4-26 R2, 10PR |
4.394 |
| 23.1-26 R3, 10PR |
4.521 |
| 23.1-26 R2, 10PR |
5.029 |
| 28L-26 R3, 12PR |
4.775 |
| 28L-26 R2, 12PR |
5.080 |
| 30.5L-32 R3, 12PR |
5.359 |
| 30.5L-32 R2, 12PR |
5.664 |
| 20.8R-38 R1, 1 STAR |
5.639 |
| 710/70R-38 R1W, 2 STAR |
5.893 |
| 18.4R-46 R1, 3 STAR |
6.020 |
| 20.8R-42 R1, 2 Star |
5.867 |
2.
Calculate crank turns for 1/10 ha.
FORMULA:
Number of Crank Turns = Wheel Turns x 2.333 x Wheel Sprocket Teeth ÷ Row Space Sprocket
EXAMPLE:
The chain sprocket has 62 teeth and the row space sprocket has 27 teeth.
Crank turns for 1/10 ha = 22.9 wheel turns x 2.333 x 62 teeth ÷ 27 teeth or 123 crank turns per 1/10 ha.
3.
Calculate seeding rate.
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