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Soil test results

Discussion in 'Homeowner Assistance Forum' started by nate243, Apr 26, 2013.

  1. nate243

    nate243 LawnSite Member
    Messages: 10

    Hello all. Just received my soil test results back.
    I have centipede that was installed as sod approx 4yrs ago in my new home, and did great the first 2 yrs. This year has a bit of yellowing and thinning especially in the backyard which is why I sent off for a soil test initially. There were a few spots (as can be seen in the photos) in the backyard that died but are starting to fill back in with the centipede stolons. I'm not too concerned about those areas, unless someone thinks I should be, and will place new sod in those spots or just let them fill in on their own slowly.

    The results recommendations:
    Soil pH - 6.9
    Phosphorus - 8 -VLow
    Potassium - 32 - Low
    Magnesium - 54 - High
    Calcium - 227

    Nitrogen: 2lb/1000sqft
    Phosphorus: 1lb/1000sqft
    Potassium: 2lb/1000sqft
    Apply 10lb/1000sqft gypsum as calcium fertilizer source


    Front Yard:

    Back Yard:
  2. Kiril

    Kiril LawnSite Fanatic
    Messages: 18,334

    Generally speaking, looks to be nitrogen and/or iron deficient, however that is not the only problem here.
  3. nate243

    nate243 LawnSite Member
    Messages: 10

    Looking for some help, care to elaborate? To add, most yards in my neighborhood look simliar to this. Live in Florida on the panhandle, and temperatures have been so up and down this winter/fall.

    My plan was to apply Lesco 15-0-15 fertilizer this spring to start, and later in the season apply a like dose with add phosphorus per the test results. In between those applications, to add the recommended gypsum also.
  4. Kiril

    Kiril LawnSite Fanatic
    Messages: 18,334

    The general yellowing would suggest possible/probable nutrient deficiency, most likely nitrogen. The yellow streaking & isolated areas might suggest possible take-all root rot. More investigation is warranted here.

    The soil test tells me very little about your site and canned lab recommendations should not be followed blindly, if at all. Further, if the soil sampling was not done properly the test results are essentially meaningless.

    That said, I wouldn't concern yourself with phosphorus. Personally I would probably lean towards a custom mix of ammonium sulfate and SOP (sulfate of potash) given your pH, but without knowing soil type, environment and soil water management can't really recommend anything with certainty.
  5. carriedrewdog

    carriedrewdog LawnSite Member
    Messages: 68

    Your 15-0-15 is missing something in the middle. A 10-10-10 fertilizer mix should be easy to find but probably will not have minors in it. I'd put down the 10-10-10 and an application of Ironite for the minors.
  6. doug1980

    doug1980 LawnSite Senior Member
    Messages: 276

    Your soil test results are very common for around here. The problem with turf yellowing is it could be several things and depending on what it is if you misdiagnose you could damage it worse. One reason for the yellowing could be Nitrogen deficiency, however if you add more Nitrogen but that wasn't the problem then your centipede could go into decline. Centipede needs 1-2 lbs of N per year no more than 2 lbs. Overwatering or under watering may be the cause more commonly overwatering which leads to a fungus or root rot.

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