RES: [compost_tea] Humic Acid

From: Jose Luiz M Garcia (gingerjo@terra.com.br)
Date: Mon Jan 13 2003 - 21:31:32 EST


 
I send samples to two different laboratories here in Brazil.
It looks like Black Hearth from Canada and Terravita have
decent and honest products. I am not saying they are the only ones
which are good, however I can testify that Humisolve is
not an honest product.
There is no Humic acid as explained before in a previous post.
Humic acid is a group of compounds ( which by the way are neutral)
which have a broad range ( from a few thousand Daltons to dozens of
thousands of Daltons) . Due to their size and molecular weight they
are not soluble in water like Fulvic acidS another group with smaller
molecular weight.
Therefore when you say three you must be referring to three thousand
types
and not only three types unless you are referring to Fulvic, Humic and
Ulmic.
Then you have three groups but Ulmic is too heavy to elicit some
biological
effect when sprayed in the plant.
So good Soluble Humates must have those two groups : Fulvic and Humic
acids comprising virtually thousands of deifferent molecules.
 
Jose
 
 
Jose, Interesting research! I am just about to buy some humic acid and
like everyone else, sure want the best.....how do you conduct your test?
 
Also, the best humic acid solutions contain several different humic
acids...the more the merrier, as I understand it. Can you comment on
which ones have 3 or more humic acids?
 
Cheers,
 
Jeff




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