Black curled leaves is it a nitrogen problem?

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GrowerNewbie

GrowerNewbie

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Hi! Newbie starting plants indoors for the first time.

I am planning on transplanting outdoors when the season permits (I’m in Ontario) and have started seeds indoors. I am growing in regular triple mix soil.
I noticed that the tips of the leaves on one of my plants is curling and turning black.

i am wondering if it’s a nitrogen problem or what’s going on and how do I fix it (as inexpensively as possible).

thank you!
 
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