TIFTON SOIL LAB
  • Home
  • Services
    • Lab Tests and Turnaround Time
    • Procedure for Taking Samples
    • Procedure for Sending Samples
    • Description of Tests
    • Customers Outside Continental U.S.
  • Resources
    • A2LA Scope of Accreditation
    • Current USGA Recommendations
    • Sportsturf Rootzone (SRM) Sands
    • Analysis Request Form
    • Permit to Receive Soil (Outside Continental US Only)
  • Clients
  • Staff
  • Contact

Current usga recommendations

USGA Recommendations for a Method of Putting Green Construction

rootzone and gravel performance factors when intermediate layer is not required

Picture
A minimum 4" layer of 2 - 9.5 mm gravel is placed above the drain tile. The 12" rootzone mix is placed above the gravel.

particle size recommendations when the intermediate layer is used

Picture
A minimum 4" layer of gravel with ≥65% sized 1/4 - 3/8" is placed above the drain tile.  A 2 - 4" layer of 1 - 4 mm Intermediate (Choker) Layer is placed above the gravel.  The 12" rootzone mix is placed above the Intermediate Layer. ​

recommended particle size distribution for a putting green rootzone mixture

Picture

Physical properties of a rootzone mixture

Picture

USGA confidence intervals for quality ​control testing

Picture
The confidence interval for organic matter is an absolute value, not a percentage of the target organic matter content. For example, a rootzone mixture with a target organic matter content of 0.7 percent would have an acceptable range of 0.55 to 0.85 percent.

  • Home
  • Services
    • Lab Tests and Turnaround Time
    • Procedure for Taking Samples
    • Procedure for Sending Samples
    • Description of Tests
    • Customers Outside Continental U.S.
  • Resources
    • A2LA Scope of Accreditation
    • Current USGA Recommendations
    • Sportsturf Rootzone (SRM) Sands
    • Analysis Request Form
    • Permit to Receive Soil (Outside Continental US Only)
  • Clients
  • Staff
  • Contact