BNNZ Press Release

The following PR has just been circulated:

BNNZ Government Agency briefing – Wellington, 11 September

Government policy work on the Carbon Zero bill highlights connections between climate change, carbon sequestration and agriculture. Water quality and allocation are also topical with the release of the Draft Policy Statement for Freshwater Management this month. 

Biochar Network New Zealand is participating in these public policy discussions, throwing light on biochar based applications that provide solutions to intractable problems currently faced by New Zealand farmers.

BNNZ were hosted by MPI in Wellington on 11 September to provide a biochar briefing to staff and other invited guests from government and industry. Ten BNNZ representatives attended, representing a wide range of research, industry and community interests, and providing a broad picture on the status of biochar in NZ and around the world.

Examples of recent industry activity were represented by Parengarenga Incorporation (Northland farming, forestry and tourism), SoilPro (horticulture soil products – Pukekohe) and Project Biochar (biochar production contractors – Otago).

Researchers from Lincoln and Massey Universities provided a summary of current knowledge on research relating to the properties of biochar and its impact on plant growth and soil properties and processes.

Carbon sequestration pathways and water quality benefits were an important focus of presentations and discussion. With voluntary carbon markets for biochar now being established around the world, BNNZ believe it is time for government and industry to explore, invest and act on the opportunities that biochar presents.

BNNZ look forward to continued engagement with government and industry in an effort to increase the awareness and adoption of biochar in a resilient and climate-friendly productive sector.

BNNZ promotes and supports activities that provide widespread awareness, understanding and acceptance of biochar in New Zealand, leading to a diverse range of production and application scenarios for the benefit of New Zealand’s agriculture, industry and environment.

Biochar is a form of charcoal used to lift productivity in agriculture and as a long-lived carbon store in soils. It can be used to enhance water quality and as a bioremediation tool for contaminated soils. The production of biochar can also deliver secondary bioenergy benefits and deal with many types of ‘liability’ biomass. Biochar has attracted worldwide attention as a Negative Emissions Technology (NET) in the latest IPCC report, presented at COP24. Biochar has been identified as having positive impacts on 12 of the 17 UN Sustainable Development Goals.

This press release is approved by the BNNZ management committee. To engage with BNNZ, we refer you to

For further information email
For more information about biochar please see:


Peter Winsley – Zero-C

Check out Peter’s submission. I’m sure a few biochar folk have posted… it would be good to have links to others ideas & thinking on biochar & the bill.

via Submission on Climate Change Response (Zero Carbon) Bill

I’ve looked for my submission on the govt website but can’t find it… or Peter’s. Maybe they did not keep the submission record up to date?

Parengarenga biochar news

Turning trash into treasure

Parengarenga Incorporation is not just focused on producing quality sheep and beef. 

General manager Jon Brough, assisted by farm manager Kathryne Easton and others, has wide-reaching visions of what the future holds to make the best use of the land. 

One initiative they are investigating is the use of a carboniser machine to turn forestry waste into charcoal, BioChar. 

They have researched what is happening in Australia with the technology where the product produced can be used to offset carbon emissions. 

All going well, Parengarenga would like to see the same results on this side of the Tasman. 

The machine is fed with slash and waste from a forestry skid site, which is then turned into something far more useful. 

“Basically, it’s a cooking process where we load it to a certain temperature and then hold it at that temperature till it pyrolyses and produces a carbon product. From there we’re going to look at options around utilising the carbon either by applying it to the pasture or using it as an animal feed in terms of an animal lick,” Easton said. 

She suggests they will look at adding molasses or something similar to encourage stock to eat it and by offering the stock access to the mix they could reduce the need for drenching. 

The carboniser they are trying is a small machine but if successful they will look at bigger machines that could also provide usable energy to power houses. 

For environmentally focused Easton the project fits well within her mantra and the incorporation’s values of doing the right thing by the soil. 

“You’ve grown a tree, you’ve got a waste product. We turn that waste product into a valuable product, add it back to our pasture and the cycle continues. The land becomes more effective on the next forestry rotation as well so you live with a minimal amount of trash. 

“So, it’s a really nice cyclic evaluation of a product that would otherwise just been waste. 

“We see this project as an exploration into our future as we analyse our own capability to head towards a carbon-neutral, methane-reduced future. This is a unique part of the country with a Maori incorporation on a journey with their whenua with aspirations to make a difference in the national and international agricultural market arena.”

Farm scale production report – Waiuku

Biochar from sawmill waste

We have a small woodlot of eucalyptus, black walnut and Australian Blackwood. The trees have not been pruned or thinned recently and there were five large (20m) pine trees overshadowing some areas. Storms and natural die off as well as the lack of thinning meant that there has and is plenty of timber to take out and find a use for.

Sick of cutting it all up for fire wood, we bought a small portable sawmill in late 2018. One unanticipated outcome of this was the large volume of ‘waste’ wood that milling creates. Some trees have such poor form that yield is only 20% of the log in milled timber. The rest is long thin strips, often too thin to bother cutting for firewood and too much work to run through a chipper for mulch.

So what to do with this timber? How about biochar?
A flame cap pit burn has been the method of choice because it allows long lengths to be used and holes are cheap. We can also dig a shallow pit relatively easily with the blade on the tractor making it the length of the scrap timber so I don’t have to cut anything to length.

C&P from Cam Smith’s FB post @ Biochar Opportunities in NZ

We find a spot close, but not too close, to the scrap timber pile. Ideally the timber has dried for a few months but only the early part of the burn needs to be really dry. You need to be away from hedges and other potential fire risks.

We do all of our burns in winter, which makes for much more pleasant working conditions and reduces the fire risk. The ideal day would have little or no wind and of there was wind it would be away from close neighbours and the road. Local roads have been closed several times in the last few years by smoke from bonfires close to the road (not by me, though!)
Make sure you have a large volume of fire fighting water. We have a 40mm hose nearby that can put out just about anything. We have also used IBC containers of water to quench in the past if we are out of hose reach. It is too late to organise this at the end or if there are problems. Do it in the beginning.

A small fire lit in the bottom of the pit with dry timber gets thing going. Then slowly add larger dry pieces. Once it is well alight you can add larger and wetter timber, but freshly cut timber, being soaking wet, will make for a smoky, difficult burn so is not suitable in any volume. Very large pieces will not always fully burn down to embers so may need to be taken out at the end and added to the next burn. Do not use timber with nails, paint or chemically treated. You will likely end up with contaminated biochar.

Each time you see ash forming on the embers, add more parallel pieces of timber. The pit will soon be full of embers. When you run out of timber, time or enthusiasm, completely fill the pit with water. Any reasonable pile of embers not completely doused can have enough energy to dry the pile and restart the fire, so do a good job of this.
The next day you can shovel out the charcoal from the pit, unless you didn’t put it out properly in which case you will just have ash! It may still be quite warm so another go with the hose won’t hurt.
Depending on the size of the pit, you may have a cubic meter of charcoal at this point.

Thanks Cam (Ed)

NZ policy on biochar – fresh opinion

Biochar is an effective negative emissions technology: so what are we waiting for?

Peter Winsley has a long association with biochar, dating back to before the establishment of NZBRC in 2007. You may find here, his frequently referenced 2007 ‘Biochar and bio-energy production for climate change mitigation‘.

His new article linked above is timely, given current NZ policy focus on climate change, zero carbon bill and discussion on methane. Please share widely.

ANZBI report

A new report Co/ our friends at ANZBI which includes some NZ content. Click on the cover image below to download from ANZBI website…

Biochar and wood vinegar are emerging technologies with numerous applications in agriculture and environmental remediation. Advocates and early adopters of these products are well versed in their positive attributes. Biochar, for example, has been shown generally to increase crop yields in tropical latitudes, remediate soil, reduce soil greenhouse gas emissions and sequester carbon amongst many other observed benefits.
Yet it is arguably the case that not enough focus has been given in financial feasibility studies to the benefits observed by users of biochar beyond its use as a soil amendment. Existing studies in high income countries tend to focus on soil amendments in low value cereal crops, and with the exception of Joseph, et al., they overlook biochar’s use as an animal feed, for soil remediation and for water use efficiency.
This report begins to address this knowledge gap by providing an account of how biochar and wood vinegar users are accruing benefits or disbenefits in their farming operations. In March and April of 2019, the Australian New Zealand Biochar Initiative (ANZBI) surveyed sixteen current users of biochar and six users of Wood Vinegar. The survey found that:
• The use of biochar as animal feed is an important emerging market in Australia. Those who feed biochar to cattle do so on a daily basis for the purpose of improved cattle health, improved cattle weight gain, methane emissions reduction and reduced feed cost.
• Biochar is being used as a soil amendment to improve the crop yields and the produce quality of higher value crops (fruits, vegetables, nuts, horticulture), but the business case remains challenging for broadacre cereal crops. These users were found frequently to produce their own biochar and to apply it on a monthly or annual basis.
• Adding small amounts of biochar and minerals to chemical fertilisers (as has now been commercialised in China) has the potential to increase yield, profitability and quality of vegetables and grains.
• Wood vinegar is being used to increase rates of seed germination, reduce fungal diseases and to improve both plant health and crop quality. Users of this product were frequently fruit and nut farmers.
Furthermore, the report includes in-depth case studies including biochar’s use in a golf course, for use in an avocado orchard, for use as an animal feed and for use in a potato farming operation. These in-depth case studies exhibit circumstances under which biochar not only breaks even for the user, but is lucrative.
A review of the biochar literature examines emerging products and innovations. It highlights the importance of practices such as banded application for improved user value and the high performance of biochar fertilisers. It further remarks on the discrepancy between the literature and the commercial reality.