There is a chart in the FAQ section that shows the nutrient uptake at different Ph levels. DL it to your desktop for reference, Ph is different for dirt and hydro so match the Ph requirements to the method of growing you are using.
Zandor Reviewed by Zandor on . Rising pH Zandor (or anyone else knowledgable about such matters), This novice can't seem to keep his nutrient solution at a constant pH. I'll set the pH to about 5.3, but within 7 or 8 hours, it will rise to over 7 (around 7.1 or so). I correct the pH by adding granulated citric acid, which takes it back down to the low 5's, but again, in only a few hours, it's risen well above the applicable range (5.2-5.9). I know pH usually drifts up (and this is even beneficial to the plant as it can absorb a Rating: 5