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My plants appear to have a nitrogen deficiency. I fert once a week with medium mix of 2-1-1 earth juice grow. Am i underfertilizing them? With two batches they look green and great til late vegging (3 feet) when all leaves begin to turn yellow curl upwards and die! This is sad PH is 7.2 Any...

Im a newbie at this, this is my second grow. 400 watt hps and a 250 MH for vegging and two 400 watt hps for flower. Problem that i cant solve is that in late vegging my plants begin to turn yellow starting at the lower fan leaves and curl up. They drop off as quick as i can pick them up. I've...