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Happy growing!
My two girls have for a couple of weeks been getting yellowing of the larger leaves. I've tried checking for root rot. None that i could see. I've repottet them to a larger pot(from 35 l to 60l as they both did outgrow the old pot. They have been getting fertilizer about once a week.
Can anyone help me with what im doing wrong?
They are not yet in the flowering phase, am I seeing that right? They desperately need nitrogen. Is your fertilizer a special product for cannabis or just regular fertilizer? Hemp is a very fast growing plant as you can see and they need LOTS of nitrogen during growing stage.
Once they are in the flowering phase they won't be able to get nitrogen from the roots, instead they will use the leaves as reservoir. Make sure you have a very good bloom-fertilizer once they switch to flowering.
If they are unable to pull nitrogen from the roots during flowering and use up leaves how comes leaves stay healthy way, way into flowering? Or better yet why do people see success in lollipopping?
Depends on various factors like genetics, water pH, initital substrate or fertilizer regimen. People usually don't try lollipopping with their first grow. Once you know your plant needs you can do these advanced technics. I don't think we see a root problem here, that looks different. OPs "allround" fertilizer was just not goot enough.
Here's a chart about fertilizer in the main phases:
As you can see, they can use a littel bit of N in flower, but if there is a major defizit they will pull it from the leave-reservoir.