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Estimative method/Barr method
http://www.aquatic-plants.org/fert/est_index/est_index1.html
This gives a bit more in depth discussion of it.
In a nutshell: you maintain a stable level of nutrients by doing large
weekly waters that prevents anything from becoming to high/in excess and
dosing every week to up to 3-4x a week(depending on light intensity/plant
biomass) to make sure nothing runs out and causes a deficiency.
Using the nutrients listed: it's cheap, requires only testing for CO2, uses
basic aquarium maintenance skills to deal with plant health.
Regards,
Tom Barr