Soil temperature

Discussion in 'Pesticide & Herbicide Application' started by RigglePLC, Oct 6, 2011.

  1. RigglePLC

    RigglePLC LawnSite Fanatic
    Messages: 13,659

    What is your soil temperature where you are located?
    Soil is 49 here in Michigan, (north side of house). But we have had a couple very light frosts and weather was cool last week. Abnormally warm weather expected this week...air temp high of 80 predicted in next few days.

    What does your crabgrass look like. Mostly dead and brown here in Grand Rapids on October 6.
  2. americanlawn

    americanlawn LawnSite Fanatic
    from midwest
    Messages: 5,954

    Yesterday's soil temp (4" depth) was 64 - 65 degrees in central Iowa (I-80 / I-35).

    59 degrees in the southeast corner of the state & 68 degrees in the NW corner of the state. Weird

    Source: Iowa State Extension

    Crabgrass here is all brown. Foxtail & barnyardgrass is still green, but will turn brown soon.
  3. agrostis

    agrostis LawnSite Silver Member
    Messages: 2,529

    78*@ 4" depth. Crabgrass is green and won't change color until the middle of the month.
  4. Squirter

    Squirter LawnSite Member
    from Zone 5
    Messages: 172

    Riggle, That's interesting, your temperature readings, although on the north side of house, are quite different than the map (below) shows. I'm wondering if 'greencast' has people in every county across the nation sticking thermometers in dirt or if they simply like to color maps of the u.s. because they are bored??? I live in centeral indiana and have been looking at that map determine when to apply some left-over dimension for winter annual weeds/poa. Right or wrong, I'm targeting 70 degrees (soil temp) for a fall ap of dimension for my purposes. Your thoughts?
  5. Ric

    Ric LawnSite Fanatic
    Messages: 11,969

    South Florida Gulf Coast Soil Temperature is very close to if not the same as the Gulf of Mexico Water Temperature in the winter . Our soil temperature in the coldest month which is January is 65 to 68 degrees. Sept Water Temperature can reach 105 or bathe water.

    The last 3 years we have had Freezes which of course kill the crabgrass. But past normal years crabgrass has survived the winter and there are still several all Crabgrass lawn even in Upscale neighborhoods.

    Add in the Fact the only Recommend Crabgrass control on St Augustine for many years has Pre emege. After Asulox was taken off the market we had nothing post emerge that worked with one application for control of Crabgrass We still have mastive Crabgrass problems. My biggest PITA is accounts were both Neighbors have crap lawns.
  6. RigglePLC

    RigglePLC LawnSite Fanatic
    Messages: 13,659

    Revising my earlier numbers--way above normal today--around 82 degrees air temp, and the same predicted for next two days.
    Soil temp at twilight 7 pm: north side in shade 60, in sun 63, but twilight, both under thick turf.

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