Yield Components of Biomass in Switchgrass

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Arvid Boe

2008

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  • Objectives of this study were to determine the importance of tiller density, number of phytomers per tiller, and mass per phytomer as: determinants of biomass yield in swards of switchgrass in the northern Great Plains, and potential indirect criteria for selection for biomass
  • Partial regression coefficients were greater than 0.0 for 93, 87, and 44% of the samples for tiller density, mass per phytomer, and number of phytomers per tiller, respectively
  • Path coefficient analysis indicated that tiller density and mass per phytomer had consistently large positive direct effects on biomass yield; whereas, number of phytomers per tiller had smaller and less consistent, albeit positive, direct effects on biomass yield
  • Progress for biomass production in swards from selection for any of the yield components will depend on heritabilities of the yield components and genetic correlations between the components and biomass
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