I do not think we need even 1/10th that amount for most systems however, but the 0.1ppm that Paul and Kevin suggested(1995/1996), and then PPS users by copying what PMDD did, is a joke.
yme;45671 said:ehm, tom?
if you use EI and use TMG as trace elements only.... you add 0,1-0,2 mg/l iron per WEEK!!!
can you explain?
I remember that you told me that if I use EI based TMG addition, I most likely do not need extra iron. I know that there is a lot of luxury uptake.... but the difference between 0,2 mg/l/week and the suggestion of adding 0,5 mg/l/day is imho extreme.
maybe I should start to dose 0,5 mg/l/day instead of trying to use h2o2
detlef;45675 said:Even Amano doses higher Fe amounts in cases . To counter colour losses he suggests Fe pulsing. If I remember correctly it is 2 drops of ECA in 5 liters on a daily basis until the problem resumes. Years ago I tested the Fe residual 15 minutes after I added the amount ADA was suggesting. I used a Dupla Fe kit and came up with 0,7ppm Fe. By the way I do not bite that higher Fe levels are of any help against whitening. Neither Tom does. But it demonstrates again higher Fe levels do not hurt if plant uptake is going strong nor does it harm shrimp in any way. BUT there are lots of questions regarding Fe levels in water: Does a certain level reflect the health status of a plant? What is the chemical procedure for Fe testing really showing up? etc etc
detlef;45692 said:What do we know for sure?????????
I think Tom answered your question right away.
detlef;45692 said:Hi yme,
I think Tom answered your question right away. Regarding nutrient uptake we all know there are ranges, larger for one nutrient and narrower for others. Plus plants are tolerant, they are capable of luxury uptake and work around (recycling, slowing growth etc) if nutrients become limiting. Ranges for P, Fe and Ca seem to be wide whereas for micros such as B they seem small. But what does a "range" really mean for a plant and what is wide or narrow? It's pure human observation, measurement and interpretation of a life species we cannot communicate directly. Responses of plants are slow at times (for us humans) which makes things more difficult.
In others words a ten times difference for Fe might mean as much for a plant like for you drinking one or ten glasses of water. It's only a question of how often you must pee (sorry). What do we know for sure?????????
jonny_ftm;45693 said:What we know for sure is that plants do extermely well with TPN, so with very low Fe compared to CSM+B or DTPS addons.
So, like Tom said, some nutrients seem to be more limiting then others. If it only influence plant growth speed, I do opt for lower Fe. Pruning twice or once a week is no go for me. Now, if you prefer fast growth for quick eye catching competition tanks, you maybe should try 10x more than the micro dose of TPN
yme;45696 said:yup, I think as well
I must say didn't know this. It also explains very well why P limitation in the old days, here in Holland, worked out very well.
IF you assume that in an EI based tank you are not limited for CO2, P, N, Fe and light?.... can plants then be limited by a trace element for which there is no "back-up" mechanism? which then would results in stunting/problems?
deduced from this: would it be wise to increase TMG dosage together with iron dosage? or is it also just fine to increase iron dosage alone?
practically, as jonny_ftm pointed out, one can grow just perfectly grow healthy plants with TMG alone. Which would suggest that the answer to my questions would be: no.