Lower leaves yellowing and dying - Help please

Jmogrower

New Member
Need help with my plants! This is my forst grow.. They are about 3 weeks old and the bottom leaves have began to yellow and die off and growth has slowed.... the are in pro mix bx soil and given vodoo juice on watering once every 4-5 days... they are under a 2700 lumen led light about 8 inches away. Is this nitrogen defiency?
 
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