Highly concentrated (10,000 mg/L)
Ferrous gluconate iron
Ferrous gluconate is better suited to foliar
feeding than iron-EDTA
Iron is immobile in plants. This means that plants
cannot divert iron from older leaves to new ones.
Therefore, deficiency symptoms appear first on new
or young leaves. Because plants use iron to
produce chlorophyll, a lack of iron results in
chlorosis, or yellowing, of the younger leaves.
Stems may also appear short and slender. If the
deficiency is severe and prolonged, each new leaf
emerges lighter in color than the preceding leaf.
When choosing an iron supplement, it is important
to know the distinction between the two forms of
iron. The iron will be in one of two oxidation
states: ferrous having a 2 charge, or ferric
having a 3 charge. Ferrous iron, the preferred
iron form and is soluble in water at any pH.
Ferric iron, however, is only soluble below a pH
of around 5.5; but if the pH is higher than 5.5,
which more than likely it will be in a planted
aquarium, the ferric iron will become insoluble
and precipitate, settling in the root zone. Once
this occurs, foliar absorbtion becomes impossible.
To overcome this precipitation, competing products
employ a chelate of ferric iron: iron-EDTA. While
this does keep it soluble, it has a couple of
drawbacks with respect to foliar uptake of iron.
(1) Iron-EDTA bonding is very strong, thus very
little of the iron will be available to the plants
over a given time frame and (2) Physiological
energy must be expended by the plant in order to
extract the ferric iron from EDTA-iron and then
convert (reduce) it to the ferrous form. Our
approach is different in that we use a complex
(not chelate) of ferrous iron in Flourish Iron%u2122.
Flourish Iron%u2122 is a highly concentrated (10,000
mg/L) ferrous iron gluconate supplement. Plants
are able to much more easily derive a bene%uFB01t
from Flourish Iron%u2122 because ferrous iron
gluconate is already in the ferrous form so they
do not expend energy reducing it. Despite what
other manufacturers may intimate, gluconate is not
harmful to plants or fish. In fact, ferrous
gluconate is better suited to foliar feeding than
is iron-EDTA owing to the relatively weaker
iron-gluconate bonding vs. iron-EDTA bonding. In
addition, ferrous gluconate has the added bonus of
being a source of carbon.
Use 1 capful (5 mL) for each 200 L (50 gallons) or
as required to maintain about 0.10 mg/L iron. For
smaller doses please note that each cap thread is
about 1 mL. Use MultiTest: Iron test kit to
monitor iron concentrations. Due to rapid
utilization, test within 30 minutes. Use as needed
to combat signs of iron deficiency (usually seen
in new growth) which include: chlorosis
(yellowing) of tissue between veins and short and
Iron (Fe) 1%
Derived from: Ferrous Gluconate
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