There needs to be a lot more research done to prove the numerous claims being made about biochar. While there is an increasing body of research and many more research initiatives in Universities, research labs etc, there is not much available in terms of research done on larger scale in a variety of settings. Krull's thoughts in this article address some of these concerns.
'I don't know where these numbers come from,' says Krull.
For a start Krull says the price of carbon will help determine whether biochar is an attractive option as will the regulations on carbon sequestration, which are yet to be worked out.
She says there is also a finite amount of biomass in Australia.
According to biochar researcher Dr Annette Cowie of the NSW Department of Primary Industries, biochar produced from current biomass stocks in Australia could offset 2% of Australia's energy emissions.
Krull says more biomass could be planted to for biochar production, but there would be competition with bioenergy production and other land uses.
The design and location of biochar production facilities would also determine how much carbon emissions are reduced.
This is because greenhouse emissions can be released during the production and fossil fuels are burnt in transporting biochar."
Farmers
Krull says reducing carbon emissions through the use of biochar will rely on farmers taking up the technology but she does not advise farmers to use biochar until further research is done.
She says some farmers are experimenting with biochar at the moment.
"There are people that are putting biomass into an open pit, generating a charred product, calling it biochar and actually selling it," she says.
"There are no controls of how it has been produced, what temperatures from what sort of material and it releases all these gases into the atmosphere."
Krull says researchers still don't know how biochar from different biomass feedstocks interact with different soil type, and in how much biochar should be used.
The above is actually going on even in major cities like New York. Farmer's market participants have been seen showing charred wood produced in the same manner as Kroll mentions above and been offered as advise to many local farmers as a way to boost their yields. This can have many consequences if the research proves the pros and cons of biochar otherwise