what is typical nutrient uptake per day?

[Dave@AquaFlora]

Hi! Does anyone know what the typical nutrient uptake per day is from
plants? Chuck Gadd's calculator is great for figuring out how much of what
compound to reach target ppms...but if I don't know how quickly this is
being used up then it's either a guessing game or I have to test the water
every day with cheap inaccurate test kits or buy VERY VERY expensive lab
ones.

I did get this calculator http://www.fwstingrays.com/DosingCalculator.htm
....but it's assuming daily uptake is 4.5ppm NO3, 1.4ppm PO4, 3.4PPM K,
0.08PPM Fe...is this average? Also, that calculator gives a lot if
inaccurate/unbelievable suggestions for dosing...since I don't think all the
bugs are worked out---like for my 15 gal it's suggesting 11 ml of KH2PO4
every other day!! If the the calculator worked 100% then it would be
ingenius!

Right now I have 25-30ppm CO2, 2.67wpg, 6Gh, 15 gallon tank wide, 50% weekly
water changes.

Thanks

Dave.

[George Pontis]

Dave@AquaFlora wrote:

> Hi! Does anyone know what the typical nutrient uptake per day is from
> plants? Chuck Gadd's calculator is great for figuring out how much of
> what compound to reach target ppms...but if I don't know how quickly
> this is being used up then it's either a guessing game or I have to
> test the water every day with cheap inaccurate test kits or buy VERY
> VERY expensive lab ones.
>
> I did get this calculator
> http://www.fwstingrays.com/DosingCalculator.htm ...but it's assuming
> daily uptake is 4.5ppm NO3, 1.4ppm PO4, 3.4PPM K, 0.08PPM Fe...is
> this average? Also, that calculator gives a lot if
> inaccurate/unbelievable suggestions for dosing...since I don't think
> all the bugs are worked out---like for my 15 gal it's suggesting 11
> ml of KH2PO4 every other day!! If the the calculator worked 100% then
> it would be ingenius!
>
> Right now I have 25-30ppm CO2, 2.67wpg, 6Gh, 15 gallon tank wide, 50%
> weekly water changes.
>
> Thanks
>
> Dave.

I can't help with the numbers that you seek. They are probably hard to
estimate in any case due to the great variability in plants and sources
of nutrients. Imagine coming up with a good number for iron dose in a
tank with flourite, which initially contains iron but is slowly
depleted.

Tom Barr has shown how to dose accurately without testing, using the
Estimative Index method. It requires large and regular water changes,
which is a problem for some. But since you are already doing them, you
could implement EI with little effort. You can read the details at
www.barrreport.com.

George
--

[Dave@AquaFlora]

Can anyone help with the amount of traces to add? I'm adding 3-4ml every
other day...? My concern is adding too little, not too much. Right now I
have 25-30ppm CO2, 2.67wpg, 6Gh, 15 gallon tank wide, 50%
weekly water changes.

Thanks!
Dave.

"George Pontis" > wrote in message
...
> Dave@AquaFlora wrote:
>
>> Hi! Does anyone know what the typical nutrient uptake per day is from
>> plants? Chuck Gadd's calculator is great for figuring out how much of
>> what compound to reach target ppms...but if I don't know how quickly
>> this is being used up then it's either a guessing game or I have to
>> test the water every day with cheap inaccurate test kits or buy VERY
>> VERY expensive lab ones.
>>
>> I did get this calculator
>> http://www.fwstingrays.com/DosingCalculator.htm ...but it's assuming
>> daily uptake is 4.5ppm NO3, 1.4ppm PO4, 3.4PPM K, 0.08PPM Fe...is
>> this average? Also, that calculator gives a lot if
>> inaccurate/unbelievable suggestions for dosing...since I don't think
>> all the bugs are worked out---like for my 15 gal it's suggesting 11
>> ml of KH2PO4 every other day!! If the the calculator worked 100% then
>> it would be ingenius!
>>
>> Right now I have 25-30ppm CO2, 2.67wpg, 6Gh, 15 gallon tank wide, 50%
>> weekly water changes.
>>
>> Thanks
>>
>> Dave.
>
> I can't help with the numbers that you seek. They are probably hard to
> estimate in any case due to the great variability in plants and sources
> of nutrients. Imagine coming up with a good number for iron dose in a
> tank with flourite, which initially contains iron but is slowly
> depleted.
>
> Tom Barr has shown how to dose accurately without testing, using the
> Estimative Index method. It requires large and regular water changes,
> which is a problem for some. But since you are already doing them, you
> could implement EI with little effort. You can read the details at
> www.barrreport.com.
>
> George
> --
>