Hydro Project Container Size

Before I start construction on my new growing machine I need a few opinions from the experts. So here I go. The system is a variation of the vertical growing unit called the Coliseum. There will be 30 pvc posts that are 4” in diameter and 6’6” tall. Each containing 10 sites, about 8” between sites center to center. Each site will be a 2” net pot filled with rock wool, the net pot fits directly into the vertical pvc post and is held in with cable ties. Inside the posts will be expanded clay pellets, 4 2gph drippers mounted at the top of the post will feed 15min every 1hr in a re-circulating system. Plants should not have to veg. any more than one week. My biggest concern is the amount of room for the roots being too small. Have used the GH buckets before and had huge plants in the little 2gal pot so I am thinking that there should be enough room to grow a small single cola plant. Also, the posts that I have are black on the inside and white on the outside, no light can get inside.

3.14 x 4 = 12.56 x 78 = 979.68 cu in per post = 97.96 cu in per plant

1 US gallon = 231 cu in

4x4 rock wool cube is 64 cu in

so, do you all think that there is enough root area to grow high yielding plants?

saaweet project man!!! is there anyway you could do a step by step on your build???( maybe a pic or 30???) i dont know about the root mass size, but i sure it works out.
good luck, and i for 1 am all ears (or eyes as the case may be) on this build.

Sounds interesting. But I think that you'll want more room for roots. So with a 4 inch round filled with rocks, and about 6 inches of vertical room for roots, you would think that would be good, but the problem is that roots won't fill that area, they will grow down, and as long as they can go down, they will continue to grow down. The lower part would be so packed that it might lead to trouble. Maybe if you could put a separator between each section, like screen, that would be like the bottom of a pot and cause the roots to fill the area.
A 6 or 8 inch round post would be much better.

HTH

What do you think is the least amount of root space that an indica/sativa/mixed plant could function normally (like 4-6 feet tall bushy and tall)? I looked at mine and they're LONG AND HUGE!! ahh sucking the water out like it's going extinct.