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This article in AJ

  1. Vol. 60 No. 6, p. 640-643
    Received: Mar 26, 1968

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Measuring the Color of Growing Turf with a Reflectance Spectrophotometer1

  1. Gerald S. Birth and
  2. George R. McVey2



A single−beam spectrophotometer was used to measure the spectral reflectance properties of growing turf. From the data a two−wavelength reflectance ratio R745/R675 was developed, for an objective index of turf color. This ratio changed from 3.0 for light green turf color to 6.5 for dark green turf color. (visual rating of 4 to 10, respectively). A two−filter instrument (Ratiospect) was used to measure this index on eight samples of turf of three species. A correlation of 0.984 was obtained between the Ratiospect readings and a visual score of turf color.

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