02-11-2021, 07:31 PM
Join Date: Mar 2008
Location: Seattle, WA
iTrader Positive Rating: 100%
| | Re: Liebig's Law of the Minimum
Originally Posted by mistergreen
I thought of the EI dosing method where you throw in all the resources into the tank.
I'm not sure I totally embrace Liebig's Law, there have been several cases I have seen where more than one nutrient was effecting healthy plant growth. I would be more inclined to say that there is usually a primary cause and likely secondary causes.
As for the EI Method it does provide a surplus of all three macro-nutrients (N, P, K), and if the pH is correct (i.e. below 7.0) sufficient ETDA iron, but very little of the other secondary nutrients magnesium, and no calcium whatsoever. It does contain manganese, boron, zinc, and molybdenum.
Living in the Seattle area our water if very, very soft and has 9 ppm of Ca and 0.6 ppm of Mg, if I don't add additional secondary nutrients to my tanks my plants just don't grow. -Roy