Few months ago I started two hydro Bhuts and for some reasons they are showing signs of nutrient deficiency and slowed growth. It's only my second years growing peppers and I'm not very good at pinpointing problems yet (or finding a solution to them). Here is my guess at what's going on.
I suspect nutrients lockout due to overfert inducing a low pH in my solution. When I changed the solutions about a month in, I got the solutions to about 1200 ppm (1000 ppm floranova grow, 100 ppm cal-mag, and 100 ppm base water). At this time the pH was around 5.8 so I tough it was ok so I let them go without monitoring the solution daily (had other business to attend). Two weeks later I looked at it and my pH was very low ( around 4) and I noticed signs of burning on the edges and tips of some leaves. It looked «dry» and the leaves show signs of yellowing ( or is it chlorosis ?) . On top of that, I noticed two days ago that my timer switch was «off», so my lights may have been on 24/7 for at least 1 month!
I washed the solution and prepared a weaker one ( around 700 ppm, pH 6.0 ). Three days after my pH was back at around 4.4 and the plant showed no sign of recovery (but It didn't get worse though). I also noticed that the roots had brown like tips and random spots so I used a bit of H2O2 in the solution before washing it again today.
My ultimate guess : I really overferted (probably because I was heavily feeding my pepper trees of last years)
The overfert induced low pH then nutrient lockout (chlorosis , slowed growth)
Lack of solution monitoring and probably solution duration use (more than a month) - root problems
Forgotten lights on 24/7 - I don't think much of a problem since light intensity is quite low on these tubes
So what I did today : Tried to remove the brown soft roots ( is that pythium? or just solid nutrient accumulation? or simply dead root cells?)
Reworked a solution of roughly 350 ppm + 100 ppm cal-mag
Put about 10 ml H2O2 in 13L of solution
Reworked my «grow tent» so that the temperature stays a bit higher. It was around 20C (68 F) before to around 27C (80 F)
Reworked my lightning setup from 4 T8 grow light tubes to a 400W MH and my homemade 225W led panel
Chlorosis or yellowing
Burned tip and edge
So now is there anything I should do other than wait and sit ?
Does this all make sense ?
Insights are most welcome !