Eu am folosit Osmocote plus inca de acum 5-6 ani(poate mai mult). Osmocote plus contine si ceva micro nutrienti, dar nu suficienti.
Am gasit pe internet un experiment :
Hi All,
In 2019 after the AGA International Convention where I heard a presentation of the possible negative effects of water column dosing on certain species of aquatic plants (Lythraceae family: Rotala species, Nesaea species, Cuphea species) I also decided to try Osmocote Plus as an experiment using them as the primary source of macro-nutrients for a tank (N,P,K). First of all about over 50% of the nitrogen in Osmocote Plus is in form of ammoniacal nitrogen (aka ammonia) so it can be very toxic to animals, cause algae outbreaks, as well as cause 'plant burn'. Also it is important to note that the product contains no secondary nutrients (magnesium, calcium, sulfur) nor any micro-nutrients (iron, boron, manganese, zinc, etc) so it is not a 'balanced' fertilizer. Also, this product is not made to be used in water and the release of nutrients is faster as a result.
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I did a lot of reading before starting this experiment and learned that placing the Osmocote Plus DIY tabs at the bottom glass with a minimum of 3" of substrate above them helps to minimize the amount of ammonia that leaches into the part of water column where the fish are located. I went with 2-1/2" of high CEC substrate (Safe-t-sorb) and followed the recommendation of one size "00" gel cap spaced 6" apart which resulted in 21 tabs in the 45 gallon tank. The result after carefully filling was high ammonia level showing up within a couple of days. This required me to do 50% water changes 2-3 times per week for about a month to keep ammonia levels minimized. My conclusion was that was way too many tabs! lol
How did the plants do? Here is a picture of the 45 gallon tall tank two weeks after planting:
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And here it is about 2 months after planting (Rotala species @ arrow):
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In the last 2-1/2 years I have set up three tanks with DIY Osmocote Plus root tabs as the primary source of nutrients and this what I have learned.
First of all start with one size "00" root tab per 10 gallons of tank volume. Root tabs seem to drop in nutrient release after five weeks so that is when I add root tabs again at the same dosing level. Getting these tabs to the bottom glass once everything is in place was a hassle. First of all the gel caps dissolve very quickly so there is little time to get the tabs in place and forceps didn't get the job done. Also, I try to place the tabs away from the base of plants to avoid root burn from the ammonia. I have found the following to do a good job of getting the gel caps down to the bottom glass:
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Secondly, the root tabs need to be augmented with a good source of micro-nutrients - I use Seachem Flourish Comprehensive dosed at 2 ml per 10 gallons (about 2 times recommended dosage). I also dose calcium sulfate and magnesium sulfate to provide the needed secondary nutrients (Ca, Mg, S).
I still do 50% weekly water changes on my tanks but I have found that the amount of algae I have do deal with on glass or plants less than it was when I did water column dosing. Also, I only have have to dose my micro and secondary nutrients once a week so my dosing time is drastically reduced. And my plants seem to do just fine with dosing nutrients in the substrate, including Anubias and Microsorum attached to the hardscape.
-Roy
45 gallon in March, 2022
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Asta ar fi linkul
https://forum.aquariumcoop.com/topic/22955-osmocote-experiment/#comment-206426