Organic Amending bed gardens and potting soil for aeration
They sink. The Question is, What is significant about rice hulls sinking as it relates to using them in a growing medium? For these hulls to go from being suspended on the top of the water and then sinking to the bottom, they had to be absorbent. What can also be observed in the bottom photo is, they keep their hull shape after soaking in water for 24 hours. The cellulose make-up of a boiled rice hull contributes to it’s ability to maintain some of its rigid characteristics after it has been exposed to moisture. This facilitates aeration in a soil needed for a microbial rich environment to produce phosphorus and root growth hormones.
The cellulose makeup and slowely resist decomposition, however, the hulls are organic and do decompose. Many garden soils, potting soils and top soils, available in bags at retail stores will list compost rice hulls as one of their materials. So, in addition to providing moisture control, and aeration to the soil, we believe boiled rice hulls can be used as a nutrient amendment as well. Please read our previous blogs on boiled rice hulls and join in on the discussion.