Jacinda Ardern said she was "youth adjacent" when she took over as Labour leader, and young voters have been the main target of her campaign.

So, after a week pushing her message to students and teachers at schools and tertiary institutions, she wound up on Saturday with another pitch to young voters – this time at the Smokefree Rockquest Final.

But she said she was not going to talk politics. "Do you get nervous?" she asked one of the performers. "I know how you feel."

Bill English tries out a rowing machine at the University of Waikato's Adams Centre.

So, did they have any advice before an important public appearance? "Pee before you go on," one of the performers called out.

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Earlier, Ardern had attended an Onam festival at the Mahatma Gandhi Centre in Auckland. That followed two street corner meetings in her Mt Albert electorate, where schools and education was again the main topic – as the selfies and hugs continued.

DAVID WHITE/STUFF Jacinda Ardern campaigns at Auckland University on Friday.

Asked about the Greens' new policy to charge for nitrate use she said that was Green policy and not Labour policy.

It would be a matter for "conversations ... after the election" if they were in Government together.

She said Labour would not try to cut the number of dairy cows but would look to manage the growth of the dairy herd.

MONIQUE FORD/STUFF Green Party leader James Shaw spent his Saturday unveiling a policy to tax pollution, and reinvest money into sustainable farming practises.

In some areas councils were putting in place a process for those who wanted to do large scale intensifications, and she favoured a more national approach.

"If we continue to expand it is going to have an effect on our environment."

On an organic farm in Wairarapa was where Greens leader James Shaw unveiled his party's policy to implement a tax on pollution and reinvest that money back into transitioning farms to more sustainable practises.

The revenue from the levy on nitrate pollution from agriculture would raise about $136.5m a year, starting with intensive dairying.

But it was not about "pinning farmers against a wall", he said. A shift to farming higher value products would increase income over time, and those who were not polluting would not be taxed.

Shaw spent the day campaigning across Martinborough and Greytown, later dropping into the boutique underwear factory Thunderpants to get a glimpse at the special Green Party fabric it was designing for the party to be wearing on election night.

Meanwhile, Ardern backed the Government's Predator Free by 2050 policy as 'laudable", but said it needed to be resourced properly.

On Saturday Prime Minister Bill English announced another $69m in conservation funding to go towards achieving the target.

Donning blue jeans, no tie, and a casual sports coat, English headed out to the safe blue streets of Tauranga and soaked up plenty of adoration, before unleashing a new attack on the "stardust" around Ardern.

The weather gods didn't get the memo, so the day began inside Waikato University's Adams Centre for high performance, instead of out on the hockey field.

English got a tour of the facility and then had a go on a set of rowing machines alongside a gaggle of boys in their early teens.

Then it was off to Mount Manganui's Ocean Sports Club, where along with his wife Mary and Conservation Minister Maggie Barry announced $69m of funding for National's Predator Free 2050 goal.

After that he headed to the Papamoa Plaza, where he made it about 50 metres over an hour, taking selfies with a kindergarten's worth of children - and plenty of adults.

After a brief cafe visit, English gave a rousing speech to a group of the party faithful in the giant hangar of an aviation museum.

"I have to say I feel much better getting up in the morning and going to do my campaign with my team than the Labour leader could possibly feel going on the campaign with her team. And that is why she's actually only doing one event a day, because they can't organise any more than that, and she hasn't got enough to say. We've done announcements every day of this campaign," English proclaimed.

He asked his supporters at the event, most of them retired, to do all they could to ensure a National victory.

"You know there is people out there, they are seeing all of this stardust in the media about the leader of the Labour Party and thinking maybe that looks a bit fresh - well I can tell them otherwise, but you know what, they believe you."