Originally Posted by mawiwauiwithlabrador
I take no credit for writing these or copying the pages... pulled the images from somewhere, but based on some of the posts I've seen they may help some of you.
Originally Posted by Roseman
PPM for Hanna Chart PPM
Seedlings, Early Sprouts 100 to 250
Early Vegging 300 to 400
Full Vegetation 450 to 700
Early Blooming 750 to 950
Full Mature Blooms 1000 to 1600
Note: EC Calculations are different, here's a conversion chart :
heres a great chart that shows how different PPM can be from meter to meter... EC is the only real universal language...