dead leaves

I was very confused,and let 2 days pass,see the development,and select an answer. I rinsed my container and proper PHed it.I dont see any deficiency developing. Thank you all for your answers.

Sorry i didn't mention that,i grow in soil.

Yes it's normal in hydro to loose bottom leaves. Bit early but you have fairly tall plant.

Hmm if I had to guess I'd say the plant don't need those leaves anymore and she's using all the nutes from it until it will die off. You have lots of healthy green growth on top and artificial light don't produce UV light (Unless UV bulb) and therefore it can not penetrate through surfaces that easily. If some leaves are not getting enough light then the plant eats those leaves and focuses on the leaves that matter. Not 100% this is the case for you but she looks healthy so few bottom leaves is probably nothing!

Hello, it looks like a manganese deficiency. This immobile macronutrient plays a fundamental role in cannabis physiology. It helps with photosynthesis, respiration, nitrogen assimilation, root cell elongation, and protects the roots from harmful microbes. A manganese deficiency will be noticeable by light green discoloration near the base of new growths. This extends to the tips, and brown spots start to emerge. Prevention • An unbalanced pH is often the root cause of a manganese deficiency. Frequently measure the pH of your substrate and keep it within optimal values so the plant can access this mineral. • Develop a manganese-rich compost by adding pineapple, tomatoes, cranberries, and carrots. Solutions • Flush your container. • Prune any affected growth that isn’t recovering. • Spray the canopy with a seaweed foliar spray. I hope this helps you, happy growing!