So each line feeds a row of pots, with a dripper - or two dripper nozzles for each pot. I am using nominally ½ litre per hour droppers, so that each will deliver 250ml per watering operation - this is a guess as to needs, but it looks to be working out well. Of course time will tell - I am watching for spikes, but I may have to change tack when they start, since not all of them will try and grow up to where I can see them.
More techie, in next posts, another day.