05-25-2004, 02:15 PM
I was hoping some of the brain-trust here can shed some light on this research from ISU. Basically, this link about CGM shows that unless you apply it at 40#/1000 sq ft you will not see any improvement in terms of the CGM's ability to control weed seed germination. It also states that CGM is 10% N and it breaks it down that at 40#/1000 this is equivalent to 4#/1000 of N. Now, what confuses me is that this flies in the face of conventional wisdom that tells us that most turfgrass species only require about 2-4# of N per 1000 annually. It also shows that on some test plots they applied it at an equivalent of 12# of N annually. :eek: Do nitrogen requirements just not apply to organics? Your thoughts?