[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Substrate heating

To: Aquatic-Plants at actwin_com
Subject: Re: Substrate heating
From: Paul Sears <psears at nrn1_NRCan.gc.ca>
Date: Tue, 29 Feb 2000 14:42:48 -0500 (EST)
In-Reply-To: <200002260848.DAA21832 at actwin_com> from "Aquatic Plants Digest" at Feb 26, 2000 03:48:02 AM

> Subject: Substrate Heating
> 
> Tom Brennan wrote:
> 
> I
> think my available Phosphate and Iron levels would be much higher if it were
> not for the steady convection and cation exchange and element reductions
> (divalent state) going on in my substrate making elements (Ammonium, K, P
> Fe, Ca, Mg and other trace elements) available to plant roots.

	Of the items in this list, K, P, Ca and Mg are all in oxidation 
states that are _not_ going to be changed in an aquarium.  The K will be K+,
the P will be in a phosphate form - effectively P(V) and the Ca and Mg will 
be Ca++ and Mg++.  The iron could be reduced from III to II in the substrate,
and ammonia could be oxidised to nitrate.

-- 
Paul Sears        Ottawa, Canada

Prev by Date: Summary: Commercial presence on APD
Next by Date: ads
Prev by thread: Re: Summary: Commercial presence on APD
Next by thread: ads
Index(es):
- Date
- Thread