do you really need that many sprayers in those things with the radius of spray that they let out? of course it has to be sprayed but dont you take into account the water spalshing and bouncing off the sides?
The number of jets and directions they spray is critical in coverages and water pressure. Fewer jets will increase pressure and decrease coverage.
The water sprayed directly on the stems or roots under higher pressure can bruise and damage them. So the jets around the parameter can be directed to spray at the sides and splash back, more oxygenated water particles splash back with less force.
More jets will increase flow and decrease pressure. So the number of jets is directly related to pump pressure and coverage area.