Dark Purple Auto first time grow outdoors

Hi, I’m new to autoflower grows and decided to grow my Dark Purple Auto from delicious seeds outdoors, I’ve had it in a 3 gallon pot from seed since beginning of June, it’s now July 12th and I’m worried about the yellowing of the leaves is that normal or would I need to supply nutrients I’ve been using Promix Root Booster 5-15-5.
 

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