A measure of acidity or alkalinity of the nutrient solution fed to plants; coco and hydroponic media require precise pH (typically 5.5–6.2) for optimal nutrient availability.
Dakota pre-saturates the coco media at pH 5.5 to 5.8 before transplanting. During the drip feed test he notes he is feeding at pH 5.6. He later mentions the organic nutrient line being run through the drip system at the same pH range.
Discussed in: Ep 004