I have another topic that I'm hoping you guys can give me your suggestions on.
In my small scale V1 octagon, I placed seedlings that were germinated in 1.5" rockwool cubes inside of 2 inch net pots, directly into the 4 PVC pipe and just top watered as necessary. What I was wanting to learn was whether or not the tap root would be able to make the 2 inch journey down to the flowing water. What I found was that only 1 of the 7 plants did so. It took 11 days for that plants root to reach the water and 10 days later his roots were 18 inches long. The other 6 plants never reached the water. The roots were seemingly being air pruned.
So for the big run coming up, it's vital that I don't put the net pots into the PVC pipe until I have roots that will hit the water. This is the best idea I have so far:
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I just ordered Rapid Rooters but I also have 1.5" rockwool. My idea is to fill the net pots with either of those 2, place a dome on top and then place 6.0 water in the tray just high enough so that the netpots will be sitting like 1/4" above the water line. Probably put a small air stone in each tray to agitate the water. What do you think?