And they adjusted for low water pressure by poking a few more holes for each plant nearer the end of the the poly tube. By avoiding "nozzles" on their tubing - which would require pressure to operate -- they greatly simplified the design of their irrigation system.
Again anything that moves liquid from point A to point B requires water pressure or the liquid will not move. So the system you describe still requires water pressure to operate. I really don't see how this simplifies because you have to empirically determine the number of holes at each plant. If you have thousands of plants, I just don't see how this is efficient or scales. Maybe I'm missing something. For small numbers of plants maybe it can make sense.
Driving through Watsonville, Ca today on my way home from the beach I saw hundreds of rows of crops growing with traditional drip lines.
Go visit the UCSC agroecology center farm. They have been using variations of this technique for years. I was surprised when I saw it too - I'd thought that it would need to be more complicated.
That's true - I asked about that and they said that they could sometimes reuse the tube if they were planting in a similar configuration - otherwise they just discarded the tubing (it is very cheap - another advantage of their system.)
