What's my problem please help

Hi my lower leaves of my plant are yellowing and some have crispy tips here's some pictures

Looks like nitrogen deficiency, and they're drying up once the nutrients are used from it. But I'm new as well, someone better will chime in. I just answer as to try to learn to diagnose problems, whether right or wrong. So I have experience for when mine comes. I'm not nearly always right. I still need to learn about fixing deficiencies. But for now diagnosing is my focus.

Thanks , anyone else with a definite diagnosis

It's nitrogen that is definite. I'd suggest increasing the N in your nutrient regimen. And checking the ph.

I use plant magic old timer grow should i just increase the dosage of this nutrient it's 5-3-3

What is your ph tha could be causing it too. If your ph is good then she just needs more food.

My soil doesn't need ph tested from what I've read my soil is plagron light mix

It's working up my plant the leaves above are going alot lighter I fed them 4 ml more nutes yesterday but problem still persists so I'm thinks should i transplant ?