What is wrong with this plant?

I woke up this morning and one of my plants looked like this? I reasearched some things and found out it may be nitrogen?

I grew a strain that was very sensitive to nitrogen so it would "claw". I fed that particular plant water and sea kelp, and did not feed the sea kelp with every watering. During flower I gave her the jamaican bat guano and sea kelp for feedings. The "clawing" and leaf curl stopped for me. I am sure some more experienced growers than I will chime in and give you their expertise/ diagnosis. In the meantime check out the plant problems thread on this site. It covers pretty much everything. Your plant really doesn't look bad at this point so you are addressing it early and that's good. What is your current feed/watering schedule?

Dominic1309 said:

I woke up this morning and one of my plants looked like this? I reasearched some things and found out it may be nitrogen?

Click to expand...

That almost looks like over watering to me. Over watering and drowning your roots can look like nute burn.

Doesn't look droopy to me so I don't think it's over/under watering. Pics look good except the new growth yellowing. In my noobish opinion id say iron deficiency. Kinda looks like early stages of pic.

But don't go adding iron check ph for lock out. 6.0-6.5 iron is best taken in

Check this out.
http://www.growweedeasy.com/iron-deficiency-cannabis