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http://msucares.com/pubs/publications/p1428.pdfHow To Apply Fertilizer
Never broadcast granular fertilizer,
and never apply undiluted
liquid fertilizer. The fertilizer will
rapidly sink to the bottom and be
tied up in soils instead of becoming
available in the water. Broadcast
powdered fertilizer into
areas at least 2 feet deep so it
can dissolve before reaching the
bottom.
If you use granular forms,
apply them in a way that minimizes
fertilizer-soil contact. You
can do this by making fertilizer
platforms – one for each 5 to 6
acres of water. Build the platforms
so you can raise or lower
them. Lay the right amount of fertilizer
on the platforms so 4
inches of water will cover them.
Tear off the top layer of each
sack. Waves will distribute the
fertilizer throughout each pond.
Building a platform construction
can be difficult in existing
ponds. An alternative method is
simply to place bags containing
the needed amount of fertilizer in
shallow water with the tops cut
out. The bags separate soil and
fertilizer, and waves will dissolve
and distribute the fertilizer.
Dilute liquid fertilizer with at
least two parts water to one part
fertilizer before application. In
small ponds, you can spray liquids
effectively from the bank
with hand-held sprayers. Boats
make application easy in larger
ponds. You can spray the diluted
fertilizer over the water surface or
let it flow into the prop-wash of
an outboard motor. You can pour
powdered formulations directly
on the water surface.