Ayeeee this week plants are still recovering from high soil pH. I bought a nice pH probe for soil media which ive been using to check pH at various depths in the plant containers. Best money I've spent. No more guess work. The tops layer of soil are in the mid 5's as that is where all of the elemental sulfur is breaking down. I drilled several holes in the side of the containers and measured pH. As I moved down the pH would slowly increase till at the bottom wr were still around 7.8. The solution is simple. I have to consistently water these plants and push the sulfur down into the lower parts of the container. I am not going to set up the automatic irrigation until the pH is somewhat consistent.
Update Day 67. So now with the help of my pH probe I'm checking soil pH every time I water the plants and I've been noticing some interesting trends. Some people say that with organics the most important thing is consistent solution pH. If you're trying to colonize soil microbes they each have specific pH ranges they survive best at. Ideally you want these colonies to help feed the plants for their entire lives so you try to maintain the ideal environment. By straying too far I've destroyed most of my microbiology and created a place for non ideal microbes to thrive and disease causing agents to persist. Using the sulfurs and phosphoric acid I'm slowly bringing the soil pH into a reasonable range. As of right now the middle of the container is around mid 7's. I've discovered that the citric acid from lemon juice breaks down incredibly fast and the water returns to near it's 9+ pH origin after a few days which is most likely what got me in this predicament. Phosphoric acid still breaks down after a few days but it's less dramatic of a delta. I need to correct for pH a few days prior to watering to allow for the delta and then I can correct once more before watering. Hopefully with this new technique we can return these plants to their vigorous growth that they had for the first month.
Update day 68. I've been dumping pH corrected water through my soil and measuring runoff pH's and of course they're high. Mid 7's. I've been sucking it up using a wetvac and correcting the pH to get into a reasonable range. What I've noticed is the buffering capacity of the runoff is much higher than the ro water I'm putting in. I corrected the solution to be in the low 6's and dumped into the soil again. I repeated this procedure several times. I noticed that by the last attempt the buffering was much less noticable and it took far less pH down to correct. I will continue to observe.
Update day 69 check the runoff pH and it was very high. I collected this and threw it in my garden outside. I measured the pH of the soil in the center and it read 7.2 which is a considerable drop from the 7.6 it was at the day before flushing. I'm on the right track. Changing pH is a slow process and I don't want to miss the mark.
@DonaldTrump, the sundae banana cookies is 4 inches. I had to cover the base in more soil to support it. For some reason that one stretched. Plants are weird. Congrats on the 2 foot monster!