Abstract
Grasses such as Miscanthus ×giganteus and Panicum virgatum (switchgrass) can potentially be used to produce bioenergy on a large scale in the Midwestern USA. The biomass productivity of these warm-season perennial grasses, particularly M. × giganteus, can be substantial, even when grown with limited inputs. The literature, however, varies regarding the nitrogen requirements for M. ×giganteus biomass production. In addition, there is a lack of information that identifies the yield-component(s) (including total tiller number, tiller weight, total tiller diameter, total tiller height, phytomer number, reproductive tiller number, vegetative tiller number, reproductive tiller height, vegetative tiller height, reproductive tiller diameter, vegetative tiller diameter, and reproductive tiller phytomer number) that contributes to M. ×giganteus biomass yields. Thus, the objective of this study was to examine the effects of fertilization on biomass yield and individual M. × giganteus plant-yield components. Plots of M. ×giganteus were planted in 2008 in Urbana, IL, USA, and received annual applications of 0, 60, or 120 kg N ha-1. M. ×giganteus productivity increased when nitrogen was applied; between 2011 and 2014, nitrogen applications of 60 or 120 kg N ha-1 produced average annual yields of 22.0 dry Mg ha-1 compared to 11.8 dry Mg ha-1 for unfertilized M. ×giganteus. Both the total number of tillers per m2 and the tiller weight also increased as N-application rates increased. Our results indicate that increased reproductive tiller density and tiller weight with increased N fertilization increased M. ×giganteus biomass yield.
Highlights
When growing crops for cellulosic bioenergy, efficient production of high-yielding biomass feedstocks is a primary goal
Increased N application rate led to a reduction in nitrogen use efficiency (NUE), which is similar to the finding of Lewandowski and Schmidt (2006)
Many other studies reported that N fertilization is not required to achieve high M. × giganteus biomass yields (Himken et al, 1997; Lewandowski et al, 2000; Heaton et al, 2004; Christian et al, 2008)
Summary
When growing crops for cellulosic bioenergy, efficient production of high-yielding biomass feedstocks is a primary goal. In the U.S Midwest, Miscanthus × giganteus Greef et Deu ex. × giganteus), a sterile, warm-season, perennial grass, shows potential as a bioenergy crop due to its great biomass production (Heaton et al, 2008). M. × giganteus is a rhizomatous grass native to East Asia that was first cultivated as an energy crop in Europe in the early 1980s (Lewandowski et al, 2000). It is believed to be a cross between the fertile species M. sinensis and M. sacchariflorus (Hodkinson et al, 2002). M. × giganteus must be propagated vegetatively using rhizome cuttings, rhizome-derived
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