The Environmental Protection Authority says 31 January is the deadline for several more rural industries to register for the Emissions Trading Scheme.
The EPA says agricultural processors, live exporters, and fertiliser importers and manufacturers are required to register with the scheme by the end of Tuesday.
These businesses must now collect data to calculate their emissions for the year, so they can file an emissions return early next year.
But they don't have to pay for the emissions recorded this year.
The Meat Industry Association says meat companies have signed, reluctantly.
Trade manager Dan Coup says registering for the scheme took only a small amount of extra administrative work. But, he says, it's what comes next that's concerning them.
The forestry sector was among the first to be included in the ETS.
But under current legislation, farming won't be brought into the scheme until 2015 at the earliest.
Fonterra says it registered almost two years ago.