3 1/2 Month Old Marijuana/Weed/Ganja Plants. Need Help!!! Nitrogen Deficiency!!!

Hey this is my first time growing these things. I grow outdoor in california and i started germinating these things about 3 1/2 months ago. I used Miracle Grow Potting Soil, and the seeds used were from various sacks collected throughout the year. Now I do believe after i supercropped them, there is a nitrogen deficiency. Could anyone please verify this for me? Also, does anyone know how much bud this will approximately yield/and when? Thanks! Original 1 1/2 Month Old Plants: 2 M