Today is the first day in the grow box. I finally got everything to boost indoor growth, and hopefully, growth will resume normally. Some of the leaves are drying up, although not overwhelmingly. It looks great overall, but it is still 2-3 weeks behind what I think is the normal growth for this seed. Let's see.
I saw that in the 7 week you showed a ph reading of 9.5 if that reading is true your ph is way way to high and is the cause of the driying process you are experiencing.
Have a nice grow mate
Thanks for your comment. I did some research and I finally decided to re-calibrate the tool. Now i have measured it again and the ph is 7.6. Now the dryness might be explained by two factors: light exposure and/or excess of nutrients. I will not add nutrients as i will have to harvest in a couple of weeks, light cannot be places in a higher position unfortunately. Will try lst next time :)
My Orion was also quite slow in the beginning, because I kept it outdoors in September and the first half of October. But it grew to 80cm within the first three weeks of flowering, so no need to worry!