How To Fertilize A Pond Or Lake

 

So, you have had a few problems with your pond or lake that seem to indicate that you need a little extra fertility. Maybe what tipped you off was:

  • Poor fishing
  • Skinny fish
  • Low fish population
  • Excessive pond algae like blanket weed or pond scum
  • Excessive lake weed growth

Whatever it was that tipped you off, you have come to the conclusion that something has to be done to increase fish production, get rid of lake weeds and pond scum, and prevent these problems in the future.

  • You have done your homework.
  • You have tested the water clarity of your lake and solved any problems related to soil particles in the water.
  • You have checked the pH and corrected it if needed.
  • You have water which is too clear to support aquatic life, so you know that you need to produce algae bloom, and you know that that means you need to fertilize your lake.

How do you fertilize a pond or lake?

There are several suitable methods for pond and lake fertilization, but let me start off with a few cautionary statements.

Liquid pond fertilizer

Liquid fertilizer should be mixed with water before being applied to a lake or pond. The liquid fertilizer will be heavier than the water it is being applied to, and will sink to the bottom where it will probably either be neutralized, or initiate unwanted plant growth.

Keep fertilizer clear of outflow

If you are using buckets or platforms suspended in the water to slowly dissolve fertilizer, make sure that they are not close to your spillway or drain pipe. This could result in the majority of your fertilizer ending up downstream.

Simple pond fertilizer method

If you are using fertilizer in plastic bags, you can lay the bag in shallow water, 2 to 3 feet deep, and slit the top lengthwise and across to allow the fertilizer to dissolve.

Fertilizer platform

If you are using a submerged platform, the platform should be about 1 to 2 feet below the surface of the water, and the proper amount of granular fertilizer can be dumped onto the platform and allowed to dissolve at it’s own rate.

Fertilizer in a bucket

The same result can be attained by suspending a 5 gallon bucket full of fertilizer with small holes drilled into the sides from a dock. be sure that it is one to 2 feet deep.

Fertilizer products formulated for ponds and lakes

There are a lot of newer fertilizer products on the market specifically designed for pond and lake fertilization that offer other options such as finely ground granules. These products come with instructions and label directions.

Special aquatic weed control note:

It is important to start fertilization early in the spring. If algae bloom is in place before weeds and filamentous pond algae have a chance to get started, this will decrease the amount of weed control needed for the pond. See also: Lake Fertilization