Originally Posted by
SmobyToker#1
Hello hoodwinked, i feel your frustrations. So,,,, firstly what are the ph and ec/ppm of tap water before ading anything to it (after its been resting for 6 hours say) 500ppm is around 1.0 ec which isnt too bad, but!!!! if you have a back ground tap water ppm of around 350-400ppm then you are basically hugely under feeding the plants. so its important to know what your starting ppm is of the water before adding nutes. If you have kept the res at around 18c and no light leaks then find it hard to be pythium. You will know if they roots are rotting they will be brown and slimy and no real white shoots and it will smell bad.
Fugure out your back ground PPM and PH and then adjust feed strength for it.
Ideally you want to be putting your feeds in roughly the same ph and ppm and allow the root zones to buffer the ph up / down. (this is what is meant by allowing a drift in ph. The ppm will go down in a feeding plant.
So what you need to do from then on when you know the back ground ppm is aim for this- ph rising from what it went in at along with ppm dropping. Or ph static and ppm dropping. If you find the ph dropping and ppm rising you have a over fed plant releasing ferts it cannot use back into the nute mix..understand.... ph rising - ppm dropping = good ph static and ppm dropping = good. ph dropping and ppm rising = not good and action required ie a flush of the rootzones with half strength feed
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