Do my plants need a higher dosage of nutrients?

Hi guys I've now flowered my plant for 4 weeks now. Some problems are starting to show up on some of the leaves. Some lower leaves are yellow and are dying and some leaves have black dead spots on them. Please have a look at the leaves and let me know what could be going wrong here. Your help will be much appreciated!

Looks like over watering to me.

A pic of the whole plant is needed to know what is going on. Low fan leaves go to shit quite often during flowering and it isn't necessarily a problem.

Looks a little calcium deficient. The curve on your leaves tell me your nuting enough maybe just a touch too much. Get some cal/mag and follow instructions..

Blindnslow said:

Looks a little calcium deficient. The curve on your leaves tell me your nuting enough maybe just a touch too much. Get some cal/mag and follow instructions..

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Could the curving of the leaves be caused by other factors such at the plant being rootbound? I transplanted the plant about two weeks back and notice the roots did pile up quite a lot at the bottom of the pot. A lot of the plant is looking quite yellow so I kinda ruled out too much nitrogen. Maybe I'm wrong though...?

I will get some cal mag. Did think that may be an issue.

Leaf curl like in your pics shows at one point you juiced it just a touch too much, not root bound. Way too much and the tips burn as well. Although some people like to push them a little. I have at times.