Iron (DTPA) - 500ml - Stable at Ph of 7.5
This form of Iron (DTPA) is an necessary part of the trace element mix as it is very important for plant health in aquatic plants.
Provides 0.60ppm Iron when dosed at 3 pumps (6ml) per 100L
Shake bottle before use
Dosage rate for 100L Tank
Use 3 pumps for every 100L
Repeat 2 times per week o
For Advanced Users:
3 pumps (6ml) per 100L
will yield the following
Iron (DTPA) 0.30ppm
EDTA vs DTPA vs EDDHA Iron.
Fe-EDTA which is commonly available in Bunnings/Garden shops etc is very "easy" and rapid for plant uptake, but the trade off is that it does not last long in the water column solution.. this iron chelate is stable at pH below 6.0. Above pH of 6.5, nearly 50% of the iron is unavailable,therefore this chelate is ineffective in alkaline environment.This chelate also has high affinity to calcium, so it is advised not to use it in calcium-rich soils or water.
Fe-DTPA ( LCA Product ) - It takes a bit more energy, but last several days, so the Fe is available to the plant longer, this iron chelate is stable in pH levels of up to 7.5, and is not as susceptible to iron replacement by calcium.
Fe-EDDHA - this chelate is stable at pH levels as high as 11.0, but it is also the most expensive iron chelate available.
Behind the Science:
Iron easily changes its oxidation state from +2 to +3 and vice versa. It is also a cofactor of many enzymes. The main work for Iron is to transfer electrons to redox cells. As a result, Cytochrome, which perform cellular respiration in the mitochondria, is rich with iron. In many enzymatic reactions of the chlorophyll, iron plays a very important role. When there is a lack of iron in the water column, the chlorophyll production starts to decrease. As a result, iron chlorosis occurs. Some symptoms of this are yellow or whitish leaf tissue between the veins, younger leaves being affected first etc. Iron can be found in plenty amount in aquatic habitats, but a major part of this is insoluble in water (Iron phosphate, Iron hydroxide), which plants can't use at all. Free irons that are usable by aquatic plants are only found in trace amount in water.
=>Chlorophyll production decreases when there is a lack of iron. The younger leaves are affected first. The shoot tips of the leaves first get a reddish purple stain and then gradually turns to white.
=>In some plants, the leaves grow smaller, i.e. Egeria Densa.
=>light colored spots or stripes may appear on the leaves of Echinodorous species plants.
=>The leaf tissue turns yellow or white faster than the veins, which remains greenish.
=>A strong iron deficiency may result in necroses on the new leaves. Necroses are black holes and spots on leaves.
=>Faster growing plants show iron deficiency symptoms first.
=>If the situation gets worse, the plants may die for having no chlorophyll at all.