Utah State greenhouse mix -- Wollastonite & rice hulls

effexxess

effexxess

Well-Known Member
PJ Diaz said:
I've done coco and rice hulls a bit in the past, but I found that fungus gnats harbor in rice hulls.
Click to expand...
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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effexxess said:
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!
Click to expand...

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

Approaches to Supplementing Silicon in Soilless Media and the Value of Silicon in the Mitigation of Drought Stress

Silicon (Si) is not considered an essential element for plants to complete their lifecycle, but is known to be beneficial for plants under environmental stress such as drought. Unlike natural soils, Si is minimally bioavailable in soilless media. With indoor agriculture and greenhouse production...
digitalcommons.usu.edu digitalcommons.usu.edu

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.
overgrow.com

Utah State University medical cannabis course

Hi DavesNotHere are you signed up for the course? If so please share a few more gems of wisdom. I have to wonder why he switched his ratio to 75/25 from 50/50 after just 1 year of his Youtube video being online which got 1.8 million views! Now all of us who adopted his (seem to be very good)...
overgrow.com overgrow.com
 
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