I’ve been a bit slow discovering this Global Research Alliance research summary in which NZAGRC staff are listed as contributing authors.

The report does not get too excited about biochar efficacy but page 7 does keep the door open to more research…

Biochar is covered mainly in pages 50, 51 & 52 and there are plenty of useful references.

It would be great to get some feedback from the international biochar community on this report so I will forward this to biochar.groups.io for comment.