Biochar Trials at Fourth Corner Nursery

Author: 
Tom Miles

Biochar Trials at Fourth Corner Nursery
Richard Haard, Fourth Corner Nursery, Bellingham, WA, December 6, 2007
Hello All - For your interest

I submitted to Tom for posting [attached] some initial soil analysis data from my charcoal block study. In am just beginning to compile a report on this work. When it is posted you will see soil analysis results averaged for each replication(2) for 2 dates , April and October. Listed are pH, Buffer pH, OM, Nitrate, Cation Exchange Capacity (CEC) and base exchange components, % Potassium, % Magnesium, % Calcium. Other soil analysis was taken but not presented here.

Keep in mind this is a 2 to 3 year study and no additional additions or treatments will be done other than continuous cropping and harvest of all growth, tops and roots, at our bare-root native plant nursery. It is my attempt to emulate Christoph Steiner, et al research in Manaus

Long term Effects of manure, charcoal and mineral fertilization on crop production and fertility on a highly weathered Central Amazonian upland soil

http://terrapreta.bioenergylists.org/node/442

Our test was compost, charcoal (two sources) mineral fertilization and control and permutations as was done in experiment above. We're in the moist mild climate of the Pacific NW, USA on a sandy loam soil. It naturally carries very high levels of potassium and calcium found also in unfarmed soil.

I have never tried this kind of intensive soil testing before and am still learning about season to season changes and how to interpet the data. I am working now on photosets taken at harvest time and these will be posted as well as a concise statement on the experiment terms and what I think the results represent.

Rich Haard -
And thanks to Larry Williams for his work with me on this project and his critical comments.