Jim, since you already use simazine on chickpeas, I have a question:  do you see this grass problem in your chickpeas?  where you are already using simazine?  If you don't have a problem, that might really clue you in that simazine will control this grass problem. 

how are you using simazine in your weed control program on chickpeas? alone? in combination with other products?

timing?  do you have issues in getting the simazine to work well in your arid climate?  or you using any management strategies to help you get it to work better?  These kinds of questions might help you to decide how to use it on corn.

I would not use simazine alone, but would use it in combination with other products, to broaden weed spectrum control. But what you use will depend on what other weeds you deal with.    Just my thoughts.