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AMS Dry refers to spray grade ammonium sulfate (21-0-0). The ammonium enhances herbicide uptake while the sulfate reacts with the calcium, magnesium and iron in the spray water forming insoluble salts to prevent antagonism with certain herbicides. This page lists all adjuvant products in our database that we have categorized as AMS Dry. Refer to adjuvant label for exact ingredients, rate of usage varies between herbicides, always follow label directions.