I do have control areas that were not treated. I have applied different amounts in different areas of sun/ shade, soil type, diiferent cutting heights and frequency of cut,on different kinds of turf on different properties. Some get water, some do not.
I did not use synthetic or bridge because i want to see the results from corn. I am not comparing synthetic/bridge/organic.
To be honest i have no desire to test synthetics anyway.
As you said, a true test would span over several seasons, no argument there, but my experiments started this spring....