Northland farmers are being encouraged to join the region's silage wrap recycling scheme after a slow uptake since it was introduced two years ago.
An estimated 400 tonnes of the non-biodegradable wrap is used in the region annually of which only 7% is recycled.
The council believes the rest is still being left behind on farms or ending up in landfills.
Environmental management committee chair Craig Brown says although people are realising recycling is a good thing to do, the council would like more to come on board.
The Agrecovery Foundation has also begun a national service to recover and recycle the estimated 4,000 tonnes of baled silage wrap used on New Zealand farms every year.
The Foundation also has a recycling programme for plastic chemical containers collected from farms and orchards.