Gordon Hirst has sent me a link to a Facebook page that is recording a 5-year rice growing field trial in Thailand which includes biochar.
https://www.facebook.com/onetonperrai/
The page needs an introduction to set the scene but if you scroll to the start (3 July 2017), you can review progress via video posts and trial records...
"A field experiment using both a biochar fertilizer/ soil enhancement and
SRI (system of rice intensification) to attempt to double the yield of a
working farm, from 500 Kg/Rai to 1000 Kg/Rai. The farm is paddy rice
farm located in Nakhon Ratchasima province ten Rai (1.6 Ha). The
experiment will last for five years"
"Rikolto in Vietnam (previously VECO Vietnam) is a member of
Rikolto, an international NGO with its International Office in Leuven,
Belgium. Rikolto’s mission is to enable and support smallholder farmers
to take up their role in rural poverty alleviation and to contribute to
feeding a growing world population in a sustainable way. Rikolto is
currently implementing the 2017-2021 programme “Supporting Inclusive and
Sustainable Agricultural Value Chain Development Benefiting
Smallholder Farmers in Vietnam” with a focus on vegetable and rice value
chains.
In April 2018, Rikolto started implementing the project “Reducing
Greenhouse Gas Emissions from Rice Production in An Giang Province,
Vietnam, through Alternate Wetting and Drying and Biochar Production”.
This project is a first step to making our target rice value chains more
environmentally-friendly and climate-smart. As part of this project, we
are looking for a (team of) consultant(s) to assess the feasibility of
transforming rice waste into biochar and market it."



