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Old 08-02-2013, 04:16 PM
turfmd101 turfmd101 is offline
LawnSite Senior Member
Join Date: Aug 2012
Location: orlando fl
Posts: 551
The heavy iron sulfate just dehydrates the crabgrass. A temporary stress to the crabgrass. Iron sulfate is a very heavy element. It is simply a byproduct of the iron industry.
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