An empirical framework for modelling transpiration use efficiency and radiation use efficiency of biomass sorghum in Mediterranean environment

  • Pasquale Garofalo Council for Agricultural Research and Economics, Research Center for Agriculture and Environment (CREA-AA), Via Celso Ulpiani 5, 70125 Bari, Italy
  • Domenico Ventrella Council for Agricultural Research and Economics, Research Center for Agriculture and Environment (CREA-AA), Via Celso Ulpiani 5, 70125 Bari, Italy
  • Marcello Mastrorilli Council for Agricultural Research and Economics, Research Center for Agriculture and Environment (CREA-AA), Via Celso Ulpiani 5, 70125 Bari, Italy
  • Angelo Domenico Palumbo Council for Agricultural Research and Economics, Research Center for Agriculture and Environment (CREA-AA), Via Celso Ulpiani 5, 70125 Bari, Italy
  • Pasquale Campi Council for Agricultural Research and Economics, Research Center for Agriculture and Environment (CREA-AA), Via Celso Ulpiani 5, 70125 Bari, Italy
Keywords: Energy crop, crop modelling, bioethanol, biomass, water consumption

Abstract

In this experimental-modelling research, the potential biomass achievable by sorghum to be converted in bioethanol was assessed and then formalized into the radiation use efficiency (RUE) and transpiration use efficiency (TUE). Dry aboveground biomass (harvested at the flowering stage) ranged between 22.6 t ha-1 and 28.34 t ha-1 over two growing seasons with a total water consumption of 382 mm and 504 mm, respectively. Starting from sampling measurements, the empirical framework allowed to reproduce daily data of dry biomass, canopy development, intercepted photosynthetically active radiation and transpiration related efficiencies. RUE and TUE resulted 4.98 g MJ-1 and 7.45 kg m-3, respectively. Their robustness (as stable parameters) was assessed through the validation process. Finally, the multiple linear regression approach, was applied to screen among limiting factors. It was pointed out that although sorghum was grown under irrigated regime, water demand resulted not fully fulfilled to achieve the full performance of the crop.

Published
2020-05-01
How to Cite
Garofalo, P., Ventrella, D., Mastrorilli, M., Palumbo, A. D., & Campi, P. (2020). An empirical framework for modelling transpiration use efficiency and radiation use efficiency of biomass sorghum in Mediterranean environment. Italian Journal of Agrometeorology, (1), 49-62. https://doi.org/10.13128/ijam-855
Section
RESEARCH ARTICLES