Utah State greenhouse mix -- Wollastonite & rice hulls

effexxess

Well-Known Member
I've done coco and rice hulls a bit in the past, but I found that fungus gnats harbor in rice hulls.
Interesting, thanks for sharing.

According to this chart, rice hulls (green line) contribute only a fraction more than other media to the total silicon.
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Anyone else using this mix?

It is supposed to give balanced silicon and pH.

The mix they use is for all their studies is:
75% peat
13% vermiculite
12% rice hulls
0.7kg/m3 wetting agent
1kg/m3 wollastonite (equals 1g/L)
1.3kg/m3 hydrated lime

Here is a publication documenting performance of the USU mix.

View attachment 5241276

I had never heard of Wollastonite before now!

Is this their most up-to-date mix?
I was tempted to enroll in the fall 2022 course..
 

In these articles they were studying silicon amendments. It is noted that the
"USU greenhouse mix is comprised of 75% peat moss, 13% vermiculite,
12% rice hulls, wetting agent, and hydrated lime to adjust pH to 6.0."

So I don't know about the Wollastonite.

Here's the post where I saw the soil mix on overgrow by someone who went to the course.
 
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