anyone have experience with this? i'm running a 50 gal res with 5.8-6.2 ph, ppm is around 2,000. 3rd week into flowering. plants are thriving, could this backfire on me somehow if i keep it up? i'd like to push it to 3,000 before harvest.
2000+ sounds great, what strain are you growing? I currently am growing Lemon Skunk from Green House and they have been as high as 3400+ PPM. This level seemed to burn them a little so I have backed off to about 3000 PPM, I am at about 42 days flower and you can see my meter readings in the last 3 or 4 pages of my journal which can be found in my signature.
When you start to raise your PPM's you will have to watch carefully as the burn could happen very quickly (6 hours or so will start to show, then rapid decline in plant helth), I find bumping the PPM up until you see very slight damage then you can back off a little. When pushing nutrients this strong remember to fluctuate your pH like it seems you are doing as you don't want to lock out any required nutrients, if your pH never drops to 5.5 you may be locking out Mn.
2000ppm is about the max of any nute for any strain... to be honest it isnt about how much you can feed to them. You need to fine tune for that strain. You say they are thriving, have you grown the present strain before? if so how is it compared to previous grows? Be very careful at that level you can easily fry your entire crop.
Very good point in knowing the genetics and fine tuning for them, I had a shared Lemon Skunk grow last year (DNA Genetics, not Green House) and at about 3500 PPM they started to fry really bad, I figured 3000 PPM was around the ceiling so I made my way up to that and have held steady with very good results.
regards,