Are you near rice growing areas? I used an experimental potting soil which used rice hulls to replace perlite and vermiculite (and lower the cost), with good results. Very strong, healthy root systems. It is organic material, so will need to be added periodically, but like the compost I'll bet it supplies some good nutrients as it breaks down. I have not used them as a soil amendment outside, so I don't know if they need to be composted first.
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