i have a 30 gal tank i am using 2,4 d amino 400 it recom 2 pints per acre using 30 gal per acre. my sprayer does not spray 30 gals per acre it is more like 13 and that is going slow.can i still put the two pints in 15 gals of water or do i have to dilute it. please leave feedback. and can i but fert. and postemergent already mixed in liquid form and were does evrybody buy there fertilizier?