We need the "diameter" thin option for Organon. In the Organon diameter thin rule you set a lower dbh and a percent removal of that (e.g. 6” dbh thin 100%) and the highest diameter to be thinned (e.g. 13” dbh and 10%) and the program thins the other dbh classes by a percent that is from a linear interpolation between the min and the max.
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To see this working, head to your live site.
I'm working on this as we speak It should be ready in the next setup later this week.
In the meantime attached is a screen shot of the latest Thinning Rule Editor.