I use a company called "the drip store" at http://www.dripirrigation.com.
For my orchard and blueberries, I uses one or more variable rate drippers per plant depending on the size of the plat.
http://www.dripirrigation.com/drip_irrigation_categories/97/drip_irrigation_parts/21

1 ac pond LMB, BG, RES, CC