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  • From: venaurafarm <venaurafarm@bellsouth.net>
  • To: permaculture <permaculture@lists.ibiblio.org>
  • Subject: Re: [permaculture] pc aquaponics
  • Date: Mon, 08 Oct 2012 12:44:59 -0400

On 10/8/2012 11:28 AM, Toby Hemenway wrote:

plants. It contains N primarily in the form of ammonia, and the usual
bacteria are present in the gravel beds (which are best made with
lava rock or some other high-edge substance) to convert it to nitrite
and nitrate.

Could biochar be used as a component, along with gravel or lava rock in the growing medium? It seems like a perfect ingredient, absorbs toxins, retains nutrients.

Lava rock has a very high carbon footprint and may contain toxins: it is sometimes manufactured in kilns fired with toxic petrochemical waste or by products or flammable industrial waste - or so I hear - maybe this has changed. Mine the rock to be converted to lava rock, fire it, store and ship it in bulk or bagged. High carbon footprint.

LL




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