Nute Burn or deficiency? browning leaves

only my 3rd plant and not had this happen before. Its in fox farm ocean forest and i gave it smallest dose of grow big 3 days ago at 3 weeks old. im leaning toward burn but I dont know if its possible to tell. I also tied down the plant 3 days ago if maybe that could be a factor? the plant is an Autoflower blue dream. Thanks in advance for any help

Looks more like nute splash and touching the soil. Pics of the whole plant?

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I’ll add also that you shouldn’t need to add nutes at 3 weeks in Ocean Forest.

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