Great start for a first grow. Maybe some good DGC tips rubbed off on you? But, I wouldn’t let any ol’DGC member rub off on you. Might clog your stomata.

I too started using a meter like that, and it got wonky and lead me astray quickly. So use other methods to supplement especially if you are going to do anything actionable.

Lastly, I don’t see…

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Check out Coco for Cannabis. Dr. MJ Coco’s guides on high frequency fertigation in coco should help a lot. Both practically and theoretically.