Sorry to hear you're having issues with your grow.
One quick form to fill out to get the best advice possible first off.
Problem:
Medium/grow method:
Feed: and supplements used:
water source:
Strain/age:
light used:
Climate:
Additional info:
This will give readers a more in depth look at what's going on. Try to be as descriptive and as detailed as you can be. A lot of problems stem from multiple mistakes.
From what I can see in the pic it looks like you might have a ton of salt build up in your soil/medium which is probably creating too acidic/base soil/medium and locking almost everything out. The green in the leaves tells me your soil is loaded with nitrogen, but without more info. A wild guess is all that we can do. When it comes to feeding especially with autos less is more. In order to feed the max amounts a plant can handle with success everything needs to be dialed in perfectly. Too little light and the plant can't use everything your pumping in, humidity and temp out of wack and your plant can't uptake water effectively, or even too quickly which causes imbalance in the plant and root zone.