Turf Tonic [1] 
A material applied to a turf surface to primarily either give a small visual boost to the grass or to green it up. Nitrogen and Iron are the main nutrients used as turf tonics.
Turf Tonic [1]
A material applied to a turf surface to primarily either give a small visual boost to the grass or to green it up. Nitrogen and Iron are the main nutrients used as turf tonics.