I think your SIP having a small gallon volume would not need an air channel. Again we are not talking about root oxygen but soil oxygen. Your volume ensures that the oxygen can get to all areas.
The oxygen at the bottom of the soil will help the bottom of the soil. But if the soil is wet it is hard to get oxygen exchange to the center of the SIP. That’s why I added the vertical channels. Now there is oxygen available to all levels of the soil. Each one is less than a gallon so it...
I just wanted to provide oxygen to the wet soil. Aeration is good but I really think these air channels are keeping the soil oxygenated. When soil is wet it’s hard for oxygen to get through it. That why we are doing so many SIP grows with yellow leaves but no other deficiency at the same time...
I took some 3” corrugated pipe and cut holes in every layer. Wrapped it in a drainage sock and placed it in the soil right on top of the resevoir. Keeps the soil oxygenated. Wet soils in absence of oxygen cause denitrifying bacteria to convert nitate to n2 and n20 which are both gases.
I think those vertical air channels really helped this grow with the yellowing. I didn’t have any issues with the wet soil releasing nitrogen like I have had before.
Day 53 Nearing the finish. Huck dieselV2 from dynastygenetics. Sour diesel leaning pheno. Took a test branch and it’s really citrus with a hint of berry. Energetic buzz that sinks into a body buzz. Temps got high for a quick minute but she’s fine now, just a little leaf taco.
Huckleberry dieselV2 day 39 flower. She has some big ass stems. I find the SIPs make huge stem growth. I’m sure you do as well. Each one is as thick as the base of my middle finger. I bet this soil comes out as one whole block of roots.