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Old 08-02-2013, 03:16 PM
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turfmd101 turfmd101 is offline
LawnSite Senior Member
Join Date: Aug 2012
Location: orlando fl
Posts: 799
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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