The Planted Tank Forum - View Single Post - Dirt losing the majority of it's nutrients after a year?
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Old 01-14-2013, 02:59 AM   #13
plantbrain
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Nitrogen is the only nutrient I think that will not last for many years. Bacteria oxidize it to NH4=>NO2=> NO3 if the plants do not get it. So after awhile, not much is left.

But with a slow rate of non CO2 plant tank growth, and with fish waste, the N needs are typically met.

You can add a little KNO3 once every 1-2 weeks, say 2-4ppm worth of NO3, will not hurt.

I measured a few sediments over time and they all pretty much drop to near zero for NO3/NH4. NO3 does not bind to CEC, which is why many places have NO3 in their ground water.
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