Yep I was in on those email threads. There is some good info and more needs to be done.

We have one pond that will not turn green - no matter what. Even with all the factors in the good range. It would turn a light brown (almost clear with a slight brown tint). I used all the suggested methods - no luck. Even tried adding water from the other green ponds to seed it. No help. We used several (6) pond fertilizers (all P or very high P with little to no N )at differing amounts. Nada - no luck. In a desperate attempt I tried a mix of 0-46-0 and equal parts 34-0-0 = half N and half P. The pond color turned a deeper shade of brown with obvious increase in plankton just not green. Then I called Bill and he did a plankton analysis. Lots of brown plankton very little green. So the N increased the brown plankton many fold. See this link. http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Main=20172&Number=259527#Post259527