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Estimative Index (EI) was designed so that the level of mineral nutrients always exceeded the plants minimum requirement and growth was dependent upon CO2 level and PAR.
The Duckweed Index idea is that you use the growth and leaf colour of a floating plant (originally "Lesser Duckweed" (Lemna minor) & subsequently "Amazon Frogbit" (Limnobium laevigatum)) to keep your plants in the <"goldilocks zone"> where the availability of <"Liebig's limiting nutrient"> never stops plant growth. It needs to be a plant with <"Diana Walstad's aerial advantage"> to take CO2 out of the equation.
In terms of test kits, nitrate (NO3-) is <"particularly problematic"> to test for in freshwater, it is actually easier in seawater because of the <"known number of chloride ions"> and a datum value you are aiming for. If you were really keen on knowing the NO3- value then an <"ion selective electrode"> is probably the way forward.
A good thing about both nitrate and phosphate is that they are highly mobile within the plant, which means you get a <"pretty instant growth response"> when you add them, if they were deficient.
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