Re: Fish Emulsion Fertilizer, Lesson 1:
As for "natural, non-mineral" sources of nitrogen, Fish emulsion and Blood Meal are good sources. The Blood Meal is usually more cost effective.
Fruting bananas grown in non-tropical environments need about 1.5 times as much potash as nitrogen. For ornamental bananas, they need about 2/3 as much potash as nitrogen.
There are "natural, non-mineral" sources of potash from plants but the concentration is low and thus you need enormous amounts to have a significant impact. Two mineral sources that are rated "certified organic" are: Sul-Po-Mag, also sold as K-Mag; and Potassium Citrate -- which is potash disolved in distilled citrus juice. The Sul-Po-Mag can be found at most nurseries (not big box stores), but for the Potassium Citrate you will likely need to go to an agriculture supply warehouse.
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