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#1
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unable to detect iron in pmdd
I have been dosing my plants with pmdd for less than a month and
noticed a strange thing: no matter how much I dosed, I could never detect any iron. I always figured it was because my iron tester (seachem) is VERY difficult to read at low levels (.1ppm). So yesterday I did a test, I put 1 drop of pmdd into the cuvette used to test iron and filled it up with blank water and tried to detect iron. There was none detected. I then put in a small amount of the solid trace element mix and dissolved that in the cuvette and still I couldn't detect any iron. I got the materials to make the pmdd from homegrown hydroponics. My guess is that the compound that they use to chelate the trace elements binds stronger to the iron than the material in the iron tester can bind to the iron. I was just wondering if anyone else has experienced this problem, and how people get around having such problems. Jason Greene |
#2
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unable to detect iron in pmdd
wondering if anyone else has experienced this problem, and how people
get around having such problems. Mabye it's your test kit... because I've got the same chemicals from HGH as well. I'm using a Hagen test kit and I can detect iron without a problem. Greg |
#3
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unable to detect iron in pmdd
jgreene wrote in message . ..
I have been dosing my plants with pmdd for less than a month and noticed a strange thing: no matter how much I dosed, I could never detect any iron. I always figured it was because my iron tester (seachem) is VERY difficult to read at low levels (.1ppm). So yesterday I did a test, I put 1 drop of pmdd into the cuvette used to test iron and filled it up with blank water and tried to detect iron. There was none detected. I then put in a small amount of the solid trace element mix and dissolved that in the cuvette and still I couldn't detect any iron. I got the materials to make the pmdd from homegrown hydroponics. My guess is that the compound that they use to chelate the trace elements binds stronger to the iron than the material in the iron tester can bind to the iron. I was just wondering if anyone else has experienced this problem, and how people get around having such problems. Jason Greene Iron test kits are very poor at determining bio available Fe. Even good ones. PMDD was developed with the notion that excess iron causes algae. But PO4 is the limiting nutrient also. Only _one_ nutrient will be a limiting nutrient if one is present. Not two. So the advice based on that is not logical unless you plan on bouncing between Fe and PO4 being your limiting nutrient. But the notion of limiting a nutrient is flawed for winning the algae battle. Algae are quite able to live on far less than plants are. Limiting nutrients hurts the plant's growth rates much more than it does the algae. PMDD was also designed using T-12 bulbs, low light tanks(and large tanks) with lower CO2 than I would recommend even with low light. If you have 2w/gal of Powercompacts etc, that's a fair amount more light. I add around 3x the recommened dosings of traces. Always have Claus who just gave a talk at the AGA meeting suggested folks to do what I have already been doing for many years back in 1998 when he spoke at SF, CA if the tank is fully planted, with CO2 and good light etc. He's not a bad guy to trust He and I found it to be true completely independantly . Regards, Tom Barr |
#4
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unable to detect iron in pmdd
I add around 3x the recommened dosings of traces. Always have
Claus who just gave a talk at the AGA meeting suggested folks to do what I have already been doing for many years back in 1998 when he spoke at SF, CA if the tank is fully planted, with CO2 and good light etc. Are you recommending changing the ratio of the trace mix portion of PMDD to 3? Greg |
#5
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unable to detect iron in pmdd
Are you recommending changing the ratio of the trace mix portion of
PMDD to 3? Greg I do not mix the traces together with other chemicals. You could do what you suggested I suppose. I add these dry: KNO3 1-3x a week depending on lighting, fish load etc K2SO4 once a week after water KH2PO4 1-3x week dependening on fish load/lighting etc The traces I dilute 2 tablespoons in 500mls of DI water and use that. Traces 1-3 x a week depending on light/fish load etc. There is no daily dosing, you don't need to do it every day. You gain nothign as faras better plant growth or less algae growth. Once every2-3 days etc is fine. It's easier to store and you can modifed the ratio of NPK macro nutrients to suit your tank and tap water. It's no harder than dosing PMDD. And it is very flexible. Some folks need PO4, some need more NO3 etc. Dissolving K2SO4 can be tough if you have granular forms. Regards, Tom Barr |
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