ALBANY, Wis. -- The Wisconsin Farm Technology Days exposition is under way in Green County this week, where thousands are getting a look at some of the newest "green" technologies for farmers.

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Among the hundreds of booths at the show are vendors selling GPS systems that stop over-fertilizing in fields and a local farm producing canola oil that it uses to power its own tractors.

"We grow our oilseed, canola, we squeeze about three gallons a bushel out, and then we can run that in our tractors to power our equipment on the farm," said William O'Brien, a farmer from Brooklyn who has built a mobile canola oil press. "Then the meal is used as feed for our livestock, so it's a holistic sort of system we put together."

The GPS system detects the end of a field or waterways and automatically shuts off fertilizer or seeding so the farmer doesn't have to worry about over-application.

"Over-applying is of course no good, whether it is fertilizer or pesticides," said Gerry Artz, a sales rep with Ag Systems in DeForest.

But many of those pesticides come from plastic bottles, and they're just a part of the mounds of plastic now piling up on farms. Experts recommend that bottles, barrels and Ag Bags for silage be compressed into bales, and then be recycled by a new company in Minnesota that can use the plastic for railroad ties or telephone poles.

"Because plastic can be recycled and has value, the concept of our exhibit is to let farmers know that there is a better option out there, and we want them to recycle it more and more as we get opportunities to do so," said Roger Springman, a manager with the Wisconsin Clean Sweep Program through the state Department of Agriculture.

All of the options seem to have farmers interested.

"All of this technology stuff eventually pays for itself. Costs get reduced and the cost of the technology gets reduced as well," said Gary Sommers, a farmer from Clinton.

Farmers at the show said that the new technologies seem to make financial sense. The canola oil is much cheaper than diesel fuel, and the GPS systems can save a lot of money on fertilizer costs, WISC-TV reported.

For those interested in seeing some of the green ideas in person, Wisconsin Farm Technology Days goes on through Thursday at the Plain View Stock Farm just outside Albany in Green County.

People can find more information at GreenFarmTech.com.