Answer to question #4. At right at $20 a acre for chemical and ams one time is all I figure I can spray $9.50 beans. Use the best pre for the weeds you have. We have been using Fierce and I also used some Verdict on one small field. Get a second pre out before the first one breaks even if you don't do a Liberty spray with it. I don't have a lot of acres to cover and I do my on spraying but on most of my acres the last two years I have made separate passes for the second pre of Dual or Zidua and then made a pass with the Liberty at a later date. I had RR beans and I think some LL beans last year I never made a in crop spray of either Roundup or Liberty and they were clean.