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Measuring the Color of Growing Turf with a Reflectance Spectrophotometer¹

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.

Key Words: Windsor bluegrass • turf color

² Agricultural Engineering Department, Purdue University, Lafayette, Ind. (formerly manager, LMI Division, Agricultural Specialty Company, Inc. Beltsville, Md.,) and Research Agronomist, O. M. Scott & Sons, Marysville, Ohio 43040.

Received for publication March 26, 1968.

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