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[compost_tea] Ameliorating boron toxicity



Boron is a negativelly charged ion and it sticks only to the
organic matter or humus fraction of the soil that would have positive
charges to hold it. Boron does not sticks to clay particles 
because they are also negatively charged and therefore would repell it.
If you have an excess of boron that means that you have build it up
over time but also that your soil has a nice humic fraction
otherwise boron would not have any place to stick in your soil.
Most soil have boron defficiency due to organic matter defficiency.
If you do not apply any other boron source as previously mentioned
like chicken manure it will eventually leach out.
Boron toxicity also decreases with calcium so that the previous
advise was a good one. Look for your calcium levels and if they are
not at 60% ( or eventually 68% depending on the texture of the soil )
as measured by a soil analysis that utilizes ammonium
acetate as soil extractor then you need to correct it to to decrease
boron
toxicity.

Jose



> Any directions here?
>
> Lloyd, what would be the direction to reduce boron concentrations in a
BD
> system?
>
>
>
> Tom Jaszewski
> www.livesoil.com
> 702-595-7012
>
Hi Tom
             What else is out of whack? Have you got calcium at good
levels - 65% CEC or better on a Perry labs test, 75% on  a Brookside .
In
our area there are a couple of patches where Boron has leached down the
profile and accumulated in heavy clay layers - its very mobile and
easily
leached - . I'd ignore the boron and work on calcium, carbon, aeration,
drainage, other trace minerals, and getting the critters moving again.
Whats
the cause behind the cause? . Dont use any chicken manure (or any other
boron sources) till you figure this all out. Put a basic BD prep program
into place (barrel compost, BD500, BD501).  Any excess is always a much
more
difficult problem to fix than a deficiency thats why I always advocate
smaller quantities. You have to get the soil system to sequester the
excess
(lock it up out of the way) and / or balance it out. In doing this its
possible to induce a temporary lack of boron in the plant that could
even
benefit from foliar applied boron at very low dose. Hugh Lovel may be
able
to help with specific use of the preps to give immediate relief but the
basic stuff still needs to be done.
Keep in touch
Cheers
Lloyd Charles
>



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