hey, thanks for the input... I added N only one watering, when the lower leaves were falling off easily when moving the plants, but it was still during stretch phase in week 2.
after that I hit them with a stronger P dose once, when flowers developed , lower N than recommended too. as for the N, I think the lower leaves falling off was also just due to lack of light below and maybe P def. not quite sure... some lower branches were turning purple/brown splotches, I think that could be also just cause these branches get no light though thus the plant feeding on them to provide for the budding.. right now I am just using NPK in line with GHE's schematic, I think about 13/16/20. just updated my fert scheme to the diary. still the yellow-greenish color of them bugs me a bit. I guess I am also just used to hps and DWC where they appear much more dark green during this period..
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