Potassium from organic decomposition
To the APD and others:
I've begun the long awaited draft of an article on substrates.
I would like to comment upon the role of organic decomposition
in providing potassium for aquatic plants. Here are some questions:
Are there any low solubility K salts that might precipitate
K in an aquarium? (I don't think so)
Is there significant K released initially from the decay of
plant material, fish food or fish wastes?
How long does K continue to be released from partially decomposed
What form does K take in living organic material? Are some of
these forms stable for long terms during decomposition?
Is peat, cellose or lignin a source of K?
Are there mineral sources for K in soils?
What happens if there is too much K a) in solution? or b) within
the interstitial water of the substrate? Does it cause osmotic
damage of plant roots (burning?) or have other undesirable
Is there any preference for K in the substrate or in solution?