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Pre-emergent breakdown

ThreeWide

LawnSite Bronze Member
Location
Georgia Z7
Something I read today suggested that pre-emergent herbicides breakdown in the soil by microbial activity.

My previous understanding was that moisture was the main trigger for breakdown. So if one applies pre-emergent when the soil temperature is 40 degrees or less, will there be any breakdown?

Knowing this could have a big impact on how I approach the January-February applications next year.
 
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