My favorite organic amendment that is added when preparing my beds for a new season is cottonseed meal. I will have to slack off on the amount I use as the price has doubled in the last few years. It gives a slow release fertilizer value and worms love the stuff.
I also use my homemade compost and some peat moss for moisture retention and pine bark fines to help keep the soil from packing.
My soil is high in phosphorous but always low in potassium so I add some potassium sulfate and sometimes a bit of wood ash. If I can get any chicken manure cheaply then I add a little but I now stay away from cow and horse manure due to the residual 2-4-D that is usually in it due to pasture spraying. I tried using cow manure from a certified organic dairy but the weed seeds were a major problem.
Bill
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