
David Johnson
Molecular biologist and co-inventor of the Johnson-Su composting bioreactor; retired from New Mexico State University's Institute for Sustainable Agricultural Research and adjunct professor at CSU Chico's Center for Regenerative Agriculture.
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Jun 28, 2026
Assessing Soil Health and Quality - Gardening Beyond Basics 76
1:29
1:48
D
1:06Diego FooterHOST
I have great tomatoes, I have great lettuce in the field." And they're wondering, okay, could it be better? Is the best thing to do, you gotta try it, or is there some sort of test? Can you see this under a microscope? Can you send a sample of soils somewhere to say, "Okay, what does my community look like?"

David JohnsonGUEST
Uh, I see a lot of, you know, looking at fungal to bacterial ratio through microscopy, you can get such a varied results that you can't really make heads or tails of what's going on.

David JohnsonGUEST
But I've sent compost samples, the same compost sample in, and had it analyzed three times, and I got three different results going from bacterial dominant to fungal dominant.
D
4:44Diego FooterHOST
What are your thoughts around percentage of organic matter in relation to soil health, and is there an upper limit where there could just be too much?
Johnson-Su Bioreactor - Gardening Beyond Basics 65
1:14

David JohnsonGUEST
The way the bioreactor is designed with the columns up the middle, you're never more than 6 to 12 inches from ambient air.
D
3:36Diego FooterHOST
What are the big differences in johnson sue bioreactor compost versus traditional compost if you just drive to the landscape yard near you and they sell compost what are the differences in those methods well
Compost for Improving the Soil - Gardening Beyond Basics 56
2:17
D
1:34Diego FooterHOST
On the other hand, you have people just piling compost on Do you think that an approach of just constantly putting on compost is it's working, but maybe you're working too hard or it's not really a means to an end? Is there some way that people can move from this, just dump it on to a more sparse application? Well,

David JohnsonGUEST
The farmer was $80 an acre more profitable by using the compost from this bioreactor and that research in Wilcox.
D
4:41Diego FooterHOST
between you took really high quality compost that is a food source and an inoculant in one and you put more of it on a poor soil initially, you're going to get results that much faster?