I made up some dolomite water so I'll try that in a regular top watering in addition to my top dressing of castings.
Going to try to build the net pot SIP today. The pot bottom is a bit of a challenge where I need to drill it out for the footer cup so I may need to figure out a way to brace the pot to stabilize it while I drill out the hole.
I was thinking more about the water dynamics in organic SIPs and whether or not there is a happy medium.
SIPs grow awesome biomass and some pretty robust plants but anecdotally at least with pretty low brix levels. Seems like we only have a few data points but your, mine and
@StoneOtter 's plants all had low readings.
So, the question is why. Do the low brix levels actually indicate an unhealthy plant or is it something else?
Maybe it
is because they move so much water into the soil that they fill the hallways with water and the microbes get drowned out from doing their job. This certainly seemed to be the case for me and my small pots.
But why do the plants look so damn good?
So maybe it is something else. Stone had low readings in his much larger Earthboxes with The Rev's soil and, visually at least, some pretty healthy plants. He did calcium through the reservoir to help with those levels.
That got me wondering if the tremendous water movement in these pots actually can produce robust and
healthy plants, but the low brix readings are really only showing the plant sugars are much more diluted with the extra water flow.
I know that those who grow hot peppers get much more heat from those fruits grown in pots allowed to dry out than from those kept fully watered.
So maybe in the case of peppers and our canna plants, the goodies are still all there, it's just the readings are diluted and they will all shine through after drying and curing?
That got me thinking about the SIP footer and it's function in these pots. If it is a matter of just temporarily diluted brix readings, then keeping the footer in full production mode might work best, but maybe change the pot dynamics a bit with a taller footer. Give the plant access to the subterranean water source via adventurous roots, but have the footer far enough away that it's wicking action doesn't reach the main pot.
In that way the plant gets all the water it wants without compromising the microbes' ability to do their job because of overly wet soil.
So, keep the water access, without as much of the wicking function. LOS growers keeping their mix constantly moist through drippers seem to do just fine in the brix department so that leads me to think it's not water access but compromised Microbial action due to overly wet soil.
In my case with very short pots maybe the answer is a smaller footer since I can't go taller, or maybe a poorer wicking material like big chunky perlite/hydroton but that's something I'll try to test in the future.
I think I'll fill a 1L SIP with hydroton clay balls and see how high the water wicks over a few days.