Iron deficiency is one of the most common deficiencies in an aquaponics garden, it is responsible for the yellowing of plant leaves. Furtunately, this Iron deficiency is also one of the easiest problems to fix: simply adding a small amount of Chelated Iron fertilizer at regular intervals is all that is needed.Iron deficiency in an aquaponics garden is quite common. In aquaponics, unless you add additional sources for the nutrients, all nutrients that come into the system will come through the fish food. Not all trace elements are introduced in the fish food.
Once you have run your aquaponics system for some time, you can quickly and easily tell if the plants are showing iron deficiency just by looking at them. When the plants have a slight yellowing of the leaves this is a strong indication for iron deficiancy. If it is left untreated, the yellowing of the leaves will become more pronounced. Plants generally react really well when the missing nutrients are introduced into the system and you should expect to see a result within a couple of days.
What is "Chelated Iron"?Chelated means that the Iron has been chemically altered so that it is possible for the Iron the be dissolved in the water. You cannot simply through a bunch of Iron nails somewhere in the system and expect the Iron to somehow dissolve (it will dissolve very slightly if your water is acidic, but you don't want it to be too acidic).
It usually comes in a powder form, and it is a yellow powder. Often, some spoon or other measuring device is included in the pack. Some shops will sell chelated iron as a liquid, but this usually turns out to me much more expensive per gram of iron. Check the labels and compare prices between powdered and dissolved chelated iron fertilizer to ensure the optimal deal.