Ammonium Sulfate and Hard Water<BR>(NH4)2SO3 <BR>Overcomes antagonistic effects of cations <BR>How? <BR>Lowers pH <BR>NH4+ binds with herbicide <BR>SO4-  binds with cations <BR>8.5-17 lbs/100 gals (dry) <BR>2.5-5.0 gals/100 gals (liquid) <BR>