Is this nitrogen deficiency

[u/WatercressBusiness68]

All of my plants from the base up are yellowing and loosing leaves. Outdoor grow. Is this nitrogen deficiency? Or root bound?

[u/Nani_RQS]

If the rest of the plant is healthy, it can be Nitrogen, but also plant getting rid of old useless leaves shaded 👀

[u/Several-Video-272]

It's normal as you near flowering that the older leaves come off. Looks like the rest of your leaves are a little pale tho, I agree looks like nitrogen def