[Terrapreta] data set

[Richard Haard]

Hello All - For your interest

I submitted to Tom for posting at  <http://terrapreta.bioenergylists.org/ 
 >  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.





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