Fertilizer is not the problem. Nutrients may be the problem. All ponds are different. Some have high natural fertility with out any fertilizer. Others have little fertility even with fertilization. Pond fertilizer generally should have no to little N in the mix (example NPK 0-46-0). High N levels can be a problem with or without fertilizer and high P levels can favor some bad plankton/algae.

See these for more info. But note they are written for raising fish (culture).

https://srac.tamu.edu/serveFactSheet/207

https://srac.tamu.edu/serveFactSheet/300

Can you give us the source documents for your concern?

Last edited by ewest; 06/26/19 04:06 PM.