Pre-emergent breakdown

Discussion in 'Pesticide & Herbicide Application' started by ThreeWide, Oct 14, 2005.

  1. ThreeWide

    ThreeWide LawnSite Bronze Member
    Messages: 1,116

    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.
  2. GreenUtah

    GreenUtah LawnSite Senior Member
    from SLC, UT
    Messages: 866

    sunlight also needs to be taken into account, along with soil type (sand/loam/clay).

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