On The wick boom I saw a pretty good design that you can make. Saw one for a 4wheeler or to mount of the loader of a tractor which would work the best so you could change the height easily. They were mainly using it to kill sage grass. It was make out of 4in pvc pipe and had a elbow at the end and extended up 6 to 8 in or so witha clean out cap on to so you could fill the pipe with round up. The had cotton rope about 1in in dia that were probably 1 1/2ft long that came out of the botton of the pipe starting at the end and would connect back in and another would come out and so on. I would say the shorter the rope the better it would wick the round up. I think the attached the rope with a nipple fitting and ran the rope through some kinda nut with a o ring in it to keep it from leaking around the rope. hard to try to explain.

on the spray I will ask our chem rep about it.