Overwatering Problems in NFT?

R

reallycoolguy

Active Member
Hey guys,
so i started my current NFT grow about 2 weeks ago. It is my first Hydro grow, i was using rockwool for about 3 years before.
I started my seeds in coco cubes and transfered them into the nft system after a week.

The roots werent long at all so I raised the water level so all of the cube is fully submerged in water. It is more like some kind of RDWC now.
Now I got signs of overwatering. Really slow growth. I thought that would not be possible in hydroponics? The plants are turning yellow from the top and are hanging down.
PH is stable 5.8 and water temperature is 20 degrees celsius. I use a small airstone in my reservoir but maybe it is not enough?

Is it bad to fully submerge the rockwool/coco cube in the water (maybe some DWC guys can help me out here)?
 
If the system is running like an RDWC, then it needs more oxygenation in the rez to make up for the lost O2 from running as NFT.

I would go back to running as true NFT if it was me, but you might as well increase O2 in the rez while you're at it. Extra O2 never hurts.

Do you have any pics of the setup? Im curious how you are doing it.
 
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