Get the dirt and water tested. You need facts not opinions from people who have never seen your lake. The only expert that has seen your lake and who should (assume has) tested the water first has made a recommendation. I have worked with a number of lakes in the same area for years with similar results and issues. One thing to keep in mind is that fertilization is not an all or nothing event. If it needs nutrients then cut the total application rate by 60-75 %. Just because you can't see and quantify (by visual) the effects does not mean they aren't there. You may be way over fertilizing. Consider much lower application rates more often - a little at a time and then wait and watch.

See the archive on fertilization.
https://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=96127#Post96127

Last edited by ewest; 06/02/25 03:40 PM.