See this starting on pg 29.
http://msucares.com/pubs/publications/p1428.pdf Fertilizer is always marked with three numbers separated
by dashes. These numbers indicate the percentage
of the fertilizer product that is made of
nitrogen (N), phosphorus (P), and potassium (K), respectively.
A fertilizer with an N-P-K of 13-37-0 is
13% nitrogen, 37% phosphorus, and 0% potassium.
e key ingredient for ponds is phosphorus (middle
number), so select a fertilizer with high phosphorus
content.
Several types of fertilizer can be used, and all
can be effective if the pond soil pH and water chemistry
are in the correct ranges. Pond fertilizers are
available in liquid, granular, or powdered forms. Liquid
fertilizers dissolve most readily, followed by
powders, and then granular types.
Typical formulations for liquid fertilizers include
10-34-0 and 13-37-0. Apply these fertilizers at the
rate of 1/2 to 1 gallon per surface acre, depending
on pond location and soil fertility (Table 6). Powdered,
highly water-soluble fertilizers, such as 12-
49-6 or 10-52-0, are available and have proven to be
effective and convenient. These formulations are
typically applied at the rate of 2 to 8 pounds per surface
acre, again depending on pond location and soil
fertility (Table 6).
Granular fertilizers are less expensive and are
available in many formulations. Most older ponds
respond well to a phosphorous-only fertilizer such
as Triple Super Phosphate (0-46-0), which is the
most economical formulation. Rates range from 4 to
12 lb per acre per application. In some areas, it may
be difficult to buy 0-46-0, but 0- 20-0 is usually
available. If it is, use twice the amount recommended
for 0-46-0.