Wednesday, 14 December 2016 07:55

Wetland rafts hold promise for farms

Written by 
Floating treatment wetlands filter nutrients from waterways before they leach Lake Areare, Waikato. Floating treatment wetlands filter nutrients from waterways before they leach Lake Areare, Waikato.

Farms are expected to benefit from experimental work by the Department of Conservation and Fonterra as they jointly trial floating wetlands in Waikato.

Developed by Massey University, the wetlands consist of native wetland plants in buoyant ‘rafts’ that sit on the water surface. These are capable of removing large amounts of nutrients: the rafts filter water in drains and runoff before it enters waterways.

This ‘Living Water’ project has located floating wetlands in drains around Lake Areare (near Ngaruawahia) to monitor the technology. The drains are “nutrient enriched”, the trial partners say. 

DOC ranger Michael Paviour, leading the work in Waikato, says good early results are seen in the trial.

“The wetlands have only been installed for a short time, but initial tests and rapid plant growth show they’re doing a good job of removing nutrients from the water.

“The floating wetlands are not a ‘silver bullet’ for raising water quality but, used with silt traps and riparian planting, they are practical and effective.”

Living Water leader Tim Brandenburg says the floating wetlands could help farmers manage nutrient levels in ponds and drains.

“Floating wetlands don’t just remove nutrients from waterways, they also attract birds and insects and the grasses can be harvested as a feed supplement.”

The trial will run until mid 2017 and if the good results continue the floating wetlands could be in waterways nationwide.

More like this

Fonterra updates earnings

Fonterra says its earnings for the 2025 financial year are anticipated to be in the upper half of its previously forecast earnings range of 40-60 cents per share.

No buyers

OPINION: Australian dairy is bracing for the retirement of an iconic dairy brand.

Grass-fed faux pas

OPINION: It seems Fonterra has quietly conceded a labelling faux pas on its iconic butter brand.

Featured

Fruit fly discovery 'concerning'

Horticulture New Zealand (HortNZ) says that discovery of a male Oriental fruit fly on Auckland’s North Shore is a cause for concern for growers.

Fonterra updates earnings

Fonterra says its earnings for the 2025 financial year are anticipated to be in the upper half of its previously forecast earnings range of 40-60 cents per share.

Nedap NZ launch

Livestock management tech company Nedap has launched Nedap New Zealand.

National

Certainty welcomed

There's been very little reaction to the government science reform announcement, with many saying the devil will be in the…

Science 'deserves more funding'

A committee which carried out the review into New Zealand's science system says the underinvestment will continue to compromise the…

Machinery & Products

Landpower win global award

Christchurch-headquartered Landpower and its Claas Harvest Centre dealerships has taken out the Global After Sales Excellence award in Germany, during…

Innovation, new products galore

It has been a year of new products and innovation at Numedic, the Rotorua-based manufacturer and exporter of farm dairy…

» Latest Print Issues Online

Milking It

No buyers

OPINION: Australian dairy is bracing for the retirement of an iconic dairy brand.

RIP Kitkat V

OPINION: Another sign that the plant-based dairy fallacy is unravelling and that nothing beats dairy-based products.

» Connect with Dairy News

» eNewsletter

Subscribe to our weekly newsletter