Just a comment about semi-hydro. I flush and refill the reservoir on a weekly basis. Letting it go longer has drawbacks. The plants will use what they need from the "cocktail" as needed, so as time goes by "cocktail" changes because the plant has used more or less N or P. In order to maintain the integrity of the "cocktail" it needs to be replaced weekly. You may have started out the week with 125ppm N but by the end of say week 3 who really knows how much N is left?
I also agree with Ross. I have lots of different plants in different media that have different culture requirements. Right now it takes me over an hour to get everything watered on a weekly basis. As someone else stated the 125ppm is a compromise. I shudder to think how long it would take me to water if I tailored the ppm N to each and every plant. While 125ppm may not be perfect for every plant it's close enough for all my plants to thrive and bloom.
Hybrid Mode
