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NOTES & UNIQUE PHENOMENA

Switchgrass Morphological Development Predicted from Day of the Year or Degree Day Models

^a USDA-ARS Pasture Systems and Watershed Management Res. Lab., Curtin Road, University Park, PA 16802-3702 USA
^b Dep. of Agron., Iowa State Univ., Ames, IL 50011 USA

mas44{at}psu.edu

Received for publication February 23, 1998. We tested recently published linear equations for predicting developmental morphology of warm-season perennial grasses on three cultivars of switchgrass (Panicum virgatum L.). Mean stage count (MSC, based on the Nebraska system) of `Cave-in-Rock' and `Kanlow' switchgrass was measured at Ames, IA, and MSC of Cave-in-Rock and `Alamo' switchgrass was measured at Stephenville, TX, during 1995. Measured MSC was compared with MSC estimated from day of the year (DOY) or growing degree day (GDD; base of 10°C) equations. The DOY equation more closely estimated MSC for switchgrass grown at Ames than at Stephenville. The GDD equation did not work well for any cultivar at either location. The equations did not work as well in Texas, probably because of genotypic interactions with daylength and climate for developmental morphology. These results indicate that the DOY equation may be useful with some varieties of switchgrass in the central Great Plains.

Abbreviations: DOY, day of the year • GDD, growing degree days • MSC, mean stage count • RMSE, root mean square error

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