It is a solution to the problem created by the wind: it has a tendency to fit through the holes in the nylon and create a "balloon effect" causing various adverse effects including some damage to the plant.
In addition, as you can see, you decrease the effectiveness of nylon in all senses!
To remedy this I thought this simple and non-expensive construction.
Step 1: The Components
In an early version appears in the video, I filled with sand pipe before connecting it to make a circle; in the second version, which is the one that I adopted as final I did go into the inside of the tube a segment of wire of 2 mm diameter, then fillet with bamboo rod, causing him to go through this after having drilled a hole;
In this way it was possible, by sticking the barrel that also serves as a mentor for the tomato that I planted in the ground, setting circles are also kept in position by wire fixed to the barrel.
1) weeds hardly take root at the nylon because the circle acts as a stopper for the light to the air.
2) as a result of pressure on the ground creating a basin that promotes the flow of water towards the inside avoiding wastage in the time of manual irrigation and encouraging the flow of rainwater.
Meanwhile greet and invite anyone who wants to give a a more convincing name to this realization as well as synthetic saying if something similar has already been realized.
Thank you for your attention and see you at the next ...
Torx from Italy