Hi growers. I have problem with yellowing leafs fr...

Hey @Betagemini, your plants looks good first of 👍. This is a common nitrogen deficiency when especially it's lower leaves that turn yellow. If new leaves aren't getting enough nitrogen than they are stealing from older leaves hence the yellowing. It's more common to see this especially as your plant matures it requires higher amount of Nitrogen as it is drawing more nutrients and minerals from the soil. Your plant is huge therefore I can see this happening. As you transition into flowering the plant will still need some nitrogen but far less than in its vegetative stage. If you start seeing brown spots on your leaves then in that case it's also missing some calcium which next year you can add dolomite lime to your soil ahead of transplanting or in the mid-term mix some cal-mag with your water. Looking forward to see this beast in flower.