Comparison of Arundo donax L. and Miscanthus x giganteus in a long-term field experiment in Central Italy: Analysis of productive characteristics and energy balance

• Published in: Biomass & bioenergy Vol. 33; no. 4; pp. 635 - 643
• Main Authors: Angelini, Luciana G., Ceccarini, Lucia, Nassi o Di Nasso, Nicoletta, Bonari, Enrico
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.04.2009; Elsevier
• Subjects: Agronomy. Soil science and plant productions; Applied sciences; Arundo donax; Arundo donax L; bioenergy; Biological and medical sciences; Biomass; crop yield; dry matter accumulation; Dry matter production; dryland farming; Energy; Energy balance; Energy crops; Exact sciences and technology; fertilizer rates; field experimentation; Fundamental and applied biological sciences. Psychology; General agronomy. Plant production; height; input output analysis; Long-term evaluation; Miscanthus; Miscanthus x giganteus; Natural energy; perennials; plant density; specialty crops; species differences; stems; Use of agricultural and forest wastes. Biomass use, bioconversion; yields; Italy; Europe; Miscanthus x giganteus; Dry matter production; Energy balance; Energy crops; Long-term evaluation; Arundo donax L; Monocotyledones; Dry matter; Arundo donax; Biomass; Energy crop; Gramineae; Angiospermae; Spermatophyta; Feasibility; Comparative study
• ISSN: 0961-9534; 1873-2909
• DOI: 10.1016/j.biombioe.2008.10.005

Miscanthus x giganteus (miscanthus) and Arundo donax L. (giant reed) are two perennial crops which have been received particular attention during the last decade as bioenergy crops. The main aim of the present study was to compare the above-ground biomass production and the energy balance of these perennial rhizomatous grasses in a long-term field experiment. The crops were cultivated from 1992 to 2003 in the temperate climate of Central Italy with 20,000 plants ha −1, 100–100–100 kg N, P 2O 5, K 2O per hectare, and without irrigation supply. For each year of trial, biomass was harvested in autumn to estimate biometric characteristics and productive parameters. Besides, energy analysis of biomass production was carried out determining energy output, energy input, energy efficiency (output/input) and net energy yield (output–input). Results showed high above-ground biomass yields over a period of 10 years for both species, with better productive performances in giant reed than in miscanthus (37.7 t DM ha −1 year −1 vs 28.7 t DM ha −1 year −1 averaged from 2 to 12 years of growth). Such high yields resulted positively correlated to number of stalks (miscanthus), plant height and stalk diameter (giant reed). Moreover, these perennial species are characterised by a favourable energy balance with a net energy yield of 467 and 637 GJ ha −1 (1–12 year mean) for miscanthus and giant reed respectively. With such characteristics, both grasses could be proposed as biomass energy crops in Southern Europe with a significant and environmentally compatible contribution to energy needs.