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It is indeed a very deep hole . Whether or not you have microbes is up to you the farmer. You can grow sterile - no microbes in fact you kill them regularly to keep it sterile. I did not have good luck with this so I go the other way and add microbes (Mykos) to my Rock Wool grows. I still feed mostly hydroponic style nutrients but I do add Cane molasses the last two weeks to feed the microbes when the plants stop producing carbohydrates for the roots.Wow holy shit, i had no clue that it was the roots that changed the pH of the media -- i presumed it was because of the degradation of the nutrients that are fed into the media. That is REALLY fucking cool that you witnessed the plant itself change the pH so drastically based on the needs it has. Now im beginning to understand why other growers suggest you allow for the pH in your fertigation to vary a little (within the appropriate range.. perhaps between 5.9-6.2). In coco/hydroponics, are the microbes still mainly in charge of breaking down nutrients and bringing them to the roots, or do the roots rely solely on direct availability? This is so interesting -- i think you've started me down a very deep rabbit hole.
You do not need to be strict with coco and a range from 6.0 to 6.4 is good because there is some buffering going on. In DWC it is better to try to keep a steady 5.8. The thing is it is going to roam all over the place. Aeration cause changes and the roots cause changes. It can get out of control very quickly.