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The Redfield Ratio?

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The Redfield Ratio?

Post by Admin on Tue Jul 05, 2011 8:07 pm

Jurgen posted this on TTK (thank u sweetie) Smile

And very interestingly the calculator did accurately predict the species of Alga I was at risk from namely Cyanobacteria Rolling Eyes which prompted my Article.

Try it yourselves and see


http://buddendo.home.xs4all.nl/aquarium/redfield_eng.htm Wink

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Re: The Redfield Ratio?

Post by Admin on Sat Aug 27, 2011 7:15 pm

Having increased the Nitrate/Phosphate Ratio whilst feeding `on-demand` this did impact the Algae Species prevalence in favour of `Eukaryotic` Green Very Happy

So the Calculator employed to measure the `Redfield Ratio` is indeed an accurate predictor Very Happy

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Re: The Redfield Ratio?

Post by DaveB on Sun Aug 28, 2011 6:12 pm

Mio unfortuanately I am unable to measure phosphate or nitrate very accurately. However this is my results. Nitrate less than 10 but slightly more than 0(lets say but could be more 2) Also phosphate slightly more than 1mg/l but a lot less than the next colour 2.5 ( lets say 1.25-1.5mg/l) Not much good I suppose. This would give me a ratio of 3 or 4 ( somewhere in the blue area on the graph) Chance of blue/green algea?

There has been periods this season when nitrate has been higher possibly up to 10 mg/l For the same phosphate reading. This would then give me a ratio of between 11 and 15. This puts me in the yellow area( aquariest paradise ?)

I have read through this in the hope that it would explain why I have,t got any blanketweed this year.In previous years my nitrate has always been 25mg/l + andthe phosphate was off the scale. 5mg/l+. Unfortunately the phosphate in the tap was also off the scale. However there seems to be a reduction of late.

Best regards Dave
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Re: The Redfield Ratio?

Post by DaveB on Sun Aug 28, 2011 7:13 pm

Mio Also last season whilstrunning RO . I managed to get the phosphate in the pond down to 0.1 and with nitrate running at about 10 mg/l this gives me a ratio of 153 . green algea. And if it was not for treating the pond with eco gold would certainly be the case.

Best Regards Dave

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Re: The Redfield Ratio?

Post by Admin on Sun Aug 28, 2011 7:36 pm

DaveB wrote:Mio Also last season whilstrunning RO . I managed to get the phosphate in the pond down to 0.1 and with nitrate running at about 10 mg/l this gives me a ratio of 153 . green algea. And if it was not for treating the pond with eco gold would certainly be the case.

Best Regards Dave

Both Species `Blue Green`Cyanobacteria types and Cladophora Green can be suspended or Filamentous Dave producing either Pea soup water or Blanketweed....the `Nutrient` cocktail in situ determine which is more likely to thrive ... and that calculator is spot on Shocked

My WLP has the `dreaded weed` and I treat it as though it were `Anoxic` due to the heavy planting meaning water is topped up only....

I`ll run some parameters there later to see what species they favour Smile and let you all know Very Happy

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WLP Parameters !

Post by Admin on Mon Aug 29, 2011 2:01 am


Nitrate 0 Phosphate 0 Very Happy

Cyanobacteria Heaven Twisted Evil



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