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CBDMed
Well-Known Member
Ok, cool, thank you!Rice hulls are definitely considered organic and are often recommended for the aeration portion of the mix. I've never used them but understand that they get broken down by the microbes over time and therefore have to be replaced for each grow unlike perlite that is inert and will last longer. But, the perlite itself will break down over time into smaller and smaller pieces and lose its effectiveness and must be replaced as well, just not as often.
Pumice is a better alternative to perlite in that it doesn't break down (at least as easily) and also doesn't float so it stays where you put it in your mix vs perlite which can tend to float up and out over time.
If you have cheap and easy access to rice hulls, they would be an excellent component for aeration.
Yes, I can see that they would break down a lot, and need replacement. But that should put some pretty good silica in the soil.
Is there any concern that rice hulls will soak up TOO MUCH water (i.e., be too wet)??
Or do rice hulls just cause things to be fluffy and aerated (and they are not too hydrophyllic)?
Dr. Google sez:
Does rice husk absorb water?
Rice husk can absorb water ranging from 5% to 16% of unit weights, and the unit weight of rice husk is 83–125 kg/m3 (Mansaray & Ghaly, 1998). The ash of rice husk contains approximately 90% silica, which is a highly porous structure and is lightweight, with high specific surface area.
5-16% seems pretty good, but I thought I should check.