Hey All, first post here.
I do 4x4x2" rockwool cubes 50-70 plants SOG in a 4x8' table with 2x1000W. I do a 5-7 day veg from small clones and plants end 25-36". My best is 0.9g/W. I have also tried larger 4x4x4" cubes side by side and saw no difference.
That being said, I struggle with salt build up and high pH (6.3-6.5) in cube, while giving 800ppm @.5conv and 5.5 pH. I do pre-soak the cubes but I think it's the green/black algae that covers the top of all cubes that causes my pH to rise.
I sample water from cube with a syringe to see where I am at. I find rockwool cubes hold so much water that I rarely need to flood more than once per day. I find that most of the time during flower 1 flood is too little and 2 floods is too much (cubes are soaked most of day) and having trouble dialing in the watering frequency.
I see advocates for larger cubes and coco mats and I am wondering what are the benefits vs straight cubes on tables? Logic tell me larger root mass = larger plant/buds, but I have not seen the benefits for small single cola SOG plants when did a side by side with larger cubes.
When do you decide that RW cube needs to be watered? When it's 50% of saturated weight, when it is just moist on the bottom, but otherwise dry?
Thanks farmers! I look forward to contributing to this forum.
