Quote:
Originally Posted by Adult_Toke
The only problem I've had with the Lucas Formula so far is my plants started to suffer from magnesium deficiencies for some reason. I'd keep some epsom salts on hand just in case they start showing signs.
Also, I was never able to get a definitive answer on what PPM levels are appropriate for the Lucas Formula. What are these " TDS @ 0.5 conversion" and "TDS @ 0.7 conversion" all about? Why need to convert to anything when it shows just what PPM my reservoir is right on my TDS meter? Right now my reservoir is at 1000-1200 ppm according to my meter.
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The GH micro should cover the mag when using R/O and PPM is a conversion from EC which is converted to PPM using either x500 or x700.
You should find out which conversion factor YOUR meter uses so you can use the correct measures,using a real time and another dip type both using dif. factors will confuse the daylights out of you if your not aware of this vairiance.