Look at the rate. Just because the ai load is different, you must put down the right rate . The lower the ai the more you must put down per 1000 s.f.. Northern rate are diff. from trans or southern, but splits of dime. at .25 at 8 weeks will give you great controll. look at doing a 1 time at .38-.50 if up pkup a new customer. this rate will give you early post, plus up too 6 months pre control. Dimesion is good herbicide.