MIMedGrower
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They basically have 3 plots with the same soil containing "chemical" fertilizers. Then to one, they add manure. To another they add x2 manure. To the control (the plot they compare the manure having plots to) they give no manure. All the plots, even the organic manure having ones are using "chemical" fertilizers.
A plant given more nutrients will show better growth, yes....
The manure has low levels of nutrients. But high bio diversity. They are showing that adding micro life to the soil increased yield but too much was not better.
You are too caught up in trying to disprove to have a discussion about this.
There is some evidence here and other tests that the breakdown of nutrients by micro life rather than direct chemical uptake may have more benefits to the plant.
I still think its more diverse forms of nutrients that give the benefit.