Gasification

Nutrient Recovery from Integrated Cellulosic Biorefineries (link)
Robert Brown, Iowa State University, Bioeconomy Institute 2008

"That Iowa has some of the richest soil in the world is no secret, and a group of researchers at Iowa State University would like to ensure that Iowa’s soil retains its high quality. These researchers are investigating alternative cropping systems and practices such as applying biochar (also called agrichar) to the soil to protect it from the loss of organic matter and fertility that could accompany the proliferation of biorefineries across Iowa’s landscape. The Iowa State research team is looking at the impact of the removal of large amounts of crop residue from agricultural fields. Their goal is to ensure that farmers will be able to generate the large amounts of biomass feedstocks that cellulosic biorefineries will need to meet the
demands of a developing bioeconomy, while also being able to return carbon
and important nutrients such as phosphorus, potassium and nitrogen back to the soil."

See Links

Potato
This is Puffergas' first test of growing potatoes in switchgrass compost. The potatoes were grown in containers and charcoal was added to the compost.
See link below:
Potato 2007 by Puffergas

Conversion of Municipal Solid Waste (MSW) into Charcoal & Producer Gas
Jalaj Kr. Chaturvedi, Shivam Enterprises, Kolkata, April 3, 2007
Charcoal Pellets from MSW

Phillip Small Blog: Making Charcoal with an Inverted Downdraft Gasifier
Phillip Small,February 10, 2007

Phillip Small described how he uses an inverted downdraft gasifier inspired by Tom Reed and Ray Garlington to make charcoal for soil fertility experiments.

Inverted downdraft gasifier photos on Flickr

From the Hypography Science Forum - TerraPreta