rjordan393;116366 said:
Pictures speak louder then words. Beautiful tank. My test indicate I have 20 ppm NO3 and 2 ppm PO4. I am going to raise the PO4 to 4 ppm and see if I noticed an improvement.
At your levels, and those Charles suggested, it simply took the limiting factor away from folks who had N or P limitation, it has NOTHING to do with Redfiled's ratio.
It had EVERYTHING to do with Liebig's law.
There was correlation that Charles rationalized was due to Redfield, but he did not test outside those ratios at NON limiting levels for the ferts in question.
When you test that, then you see that rations do not matter(well, as long as they are not massive, say 100000:1 or something, but then they are either very limiting or toxic due to high levels/salinity stress etc)
Liebig's law is very straight forward. As long as you are over the non limiting value relation to the other factors, then ratios should be independent on plant and algae growth.
Put another way, Charles made a conclusion, then went to see what facts he find to support it.
So did Paul Sears when they developed PMDD for algae control here:
http://www.thekrib.com/Plants/Fertilizer/sears-conlin.html
So have many about say K+, or Fe, or Ca/Mg ratios being some magical cure all. It's not personal towards you, but having listened to same old myths for decades, then others repeatedly falling for the same old failure of logic, ah.......well.
These are relatively EASY to falsify however.
That pretty much resolves most people's hypothesis and questions, but some are VERY stubborn and do not learn from their mistakes.
I could be wrong, but I've not seen evidence that I am about these issues. Once I do, I will happily recant. This is not the case for those who have their hypotheses falsified and continue to support and leave the myth up on the web.
Paul Sears was quick to admit it, but plants still do grow with strong PO4 limitation, he suggested about 0.2ppm, which is moderate to strong limitation, but nothing like many suggested prior, the less, the better some use to say.
Most Never admit their hypothesis was wrong.
I've falsified some of my own conclusions and admitted they were wrong, a heck of lot of them!!!
That's how I learn.
Old saying: correlation does not imply cause.