Dry Spots Between Rotors

Discussion in 'Irrigation' started by Felco #2, Aug 27, 2010.

  1. AI Inc

    AI Inc LawnSite Fanatic
    Posts: 25,216

    ok , so #3s in the corners and #6 on the halfs for 30 minutes , how many times a day and how many days a week? From the pic , Im assuming full sun?
     
  2. Kiril

    Kiril LawnSite Fanatic
    Posts: 18,298

    Tile probe the brown areas and compare to non-brown areas.
     
  3. Felco #2

    Felco #2 LawnSite Member
    Posts: 41

    Yes, full sun. On a normal year, one with regular or semi-regular rainfall, 30 minutes twice a week is sufficient. My schedule has been all over the place this year, but always >1 hour per week. I probably need to do another cup test. I think the distinct pattern of the dry spots interesting. Wondering if most properly designed systems will get these dry patterns if the turf is under watered? You know, like it's inherent to sprinkler irrigation. Is that notion all wet?
     
  4. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 46,901

    It isn't possible for blue nozzles to provide uneven coverage. Hunter says so. :p
     
  5. Felco #2

    Felco #2 LawnSite Member
    Posts: 41

    Soil conditions are fairly uniform. I pull cores throughout the lawn for analysis twice a year. In fact, just did that yesterday. Didn't find any dry soil, but we've had recent rain. I will take a look again, especially in the problem areas, when things dry out again.
     
  6. Kiril

    Kiril LawnSite Fanatic
    Posts: 18,298

    Not looking for dry soil .... looking for compaction.
     
  7. Felco #2

    Felco #2 LawnSite Member
    Posts: 41

    No compaction issues. Soil was prepped well prior to sod install.
     
  8. Kiril

    Kiril LawnSite Fanatic
    Posts: 18,298

    What does that mean ... prepped? A properly prepped soil would have been tilled to 12" with a final SOM% of no less than 8-10%.

    How long ago was the lawn installed?

    How about posting your soil test results?
     
  9. The spacing is off but the reality is according to an old chart that 1" a week in Aug ain't gonna cut it. Bump it up to three inches a week and see what happens.


    Table 2. NORMAL EVAPOTRANSPIRATION DATA FOR NORTH CAROLINA (INCHES)
    MONTH
    Asheville Charlotte Raleigh Wilmington
    January
    0.5 1.95 2.01 2.1
    February
    0.63 2.44 2.44 2.64
    March
    1.35 4.07 4.0 4.21
    April
    2.65 6.04 5.81 6.35
    May
    4.33 7.16 6.38 7.31
    June
    5.83 7.63 6.87 7.24
    July )
    6.36 7.64 6.89 7.53
    August
    5.76 7.06 6.25 6.4
    September
    4.11 5.45 4.88 5.34
    October
    2.4 3.87 3.56 4.0
    November 1.03 2.7 2.71 2.86

    December 0.56 2.07 2.15 2.39
     
  10. Kiril

    Kiril LawnSite Fanatic
    Posts: 18,298

    3 inches/week ..... are you insane? The numbers you just posted are monthly averages, NOT weekly. Even at the highest monthly reported (July in Charlotte) that is only ~ 1.9 inches per week. At 70% ETo, that is ~1.33"/week. If the guy lives in Charlotte and is watering 1" per week in August, he is pretty darn close to being spot on.
     
    Last edited: Aug 28, 2010

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