Towards Miscanthus combustion quality improvement: the role of flowering and senescence

Global Change Biology. Bioenergy
Elaine F JensenI S Donnison

Abstract

In commercially grown Miscanthus × giganteus, despite imposing a yield penalty, postwinter harvests improve quality criteria for thermal conversion and crop sustainability through remobilization of nutrients to the underground rhizome. We examined 16 Miscanthus genotypes with different flowering and senescence times for variation in N, P, K, moisture, ash, Cl and Si contents, hypothesizing that early flowering and senescence could result in improved biomass quality and/or enable an earlier harvest of biomass (in autumn at peak yield). Ideal crop characteristics at harvest are low N and P to reduce future fertilizer inputs, low K and Cl to reduce corrosion in boilers, low moisture to reduce spoilage and transportation costs, and low Si and ash to reduce slagging and consequent operational downtime. Stems and leaves were harvested during summer, autumn and then the following spring after overwinter ripening. In spring, stem contents of N were 30-60 mg kg-1, P were 203-1132 mg kg-1, K were 290-4098 mg kg-1, Cl were 10-23 mg kg-1 and moisture were 12-38%. Notably, late senescence resulted in increased N, P, K, Cl, moisture and ash contents, and should therefore be avoided for thermochemical conversion. Flowering and senescence led ...Continue Reading

References

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Apr 20, 2013·Journal of Experimental Botany·Paul R H RobsonIain S Donnison
Mar 24, 2017·Global Change Biology. Bioenergy·Jon P McCalmontJohn Clifton-Brown
Mar 27, 2015·Materials·Teresa MirandaSergio Nogales

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Citations

May 26, 2017·Frontiers in Plant Science·Yasir IqbalIris Lewandowski

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Methods Mentioned

BETA
dissect

Software Mentioned

REML
eager
Genstat

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