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Herbage Accumulation of Three Bahiagrass Populations during the Cool Season

^a USDA-ARS, Crop Genet. and Breeding Res. Unit, Coastal Plain Exp. Stn., Tifton, GA 31793
^b Univ. of Florida, Inst. of Food and Agric. Sci., Range Cattle Res. and Educ. Cent., Ona, FL 33865
^c Inst. of Food and Agric. Sci., Dep. of Statistics, Univ. of Florida, Gainesville, FL 32611-0339

Corresponding author (rngates{at}tifton.cpes.peachnet.edu)

Fall and winter are periods of critical forage shortage in subtropical regions of the world, including the extreme southeastern USA. Cool-season herbage accumulation has not been documented for bahiagrass [Paspalum notatum Flügge var. saurae Parodi] that has been selected using recurrent restricted phenotypic selection (RRPS) for increased warm-season yield. Regrowth of `Pensacola', `Tifton 9', and RRPS Cycle 18 that accumulated for 15 or 30 d was harvested from mid-September through mid-April at Tifton, GA and Ona, FL for 2 yr. Herbage accumulation was essentially parallel for the three populations; minimums were coincident in midwinter, and maxima generally occurred at the first autumn harvest or last spring harvest. Fall and spring yields of Tifton 9 and RRPS Cycle 18 were generally higher than those of Pensacola and often more than double. This advantage was more pronounced at Ona than Tifton. Digestibility (600 g kg^-1) and crude protein (CP) concentration (150 g kg^-1) at Ona remained high throughout the cool season. However, forage quality of bahiagrass at Tifton tended to decrease with increased frosts. Cool-season growth of three bahiagrass populations was slow, but RRPS selection has led to populations with greater growth potential, except when cold temperatures prohibit growth entirely.

Abbreviations: CP, crude protein • IVDMD, in vitro dry matter disappearance • IVOMD, in vitro organic matter disappearance • RRPS, recurrent restricted phenotypic selection

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