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All OPICO Variocast Seeders have a spoked land wheel drive to give constant forward speed related seed metering.

Above: Example of the Variocast wheel drive on an Simba Cultipress
Electronic versions use a pulse senor to feed information back to the control box whilst standard mechanical drive machines use a flexible drive cable connected straight to the metering gearbox.
| Above left: Example of Variocast land wheel drive on a Maxilift. Above right: A Picture of Variocast mounted on a He-va Disc Roller. |
On some tractors it is possible to connect the electronic machine to the tractor radar system if this is desired.
Forward speed related metering means accurately maintained seed rates on high draft machines and in awkward shaped fields where ground speeds may vary.
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