If you know you will have runoff from fertilized lawns and it is likely to keep occurring then it will be very hard to limit the incoming nutrients. I don't think in that case the constant adding of alum to the pond will be efficient or work well. That leaves 2 approaches. One treat with something to kill or limit the plankton (as fish are a small concern) or two look into one of the waste water/landfill products to bond P to the soil over a large area. May be others I am missing.


From the archives - Soil & Water test links

Soil Test Laboratories in Michigan
Soil & Plant Nutrient Lab
Michigan State University
Plant & Soil Sciences Building, Rm. A-81
East Lansing, MI 48824-1325
(517) 355-0218
Although you can send your soil sample directly to the lab, your best bet is to contact your local extension office to obtain a soil collection kit and fee schedule. (The lab will direct you to your local extension office if necessary.) Your soil test results will be sent to your extension office.






Last edited by ewest; 08/21/08 10:05 AM.