Co-composting of sweet sorghum biomass with different nitrogen sources

Ana M. Rodrigues, Luís J. Ferreira, Ana L. Fernando, Paula Urbano, J. Santos Oliveira

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


Composting of waste biomass from sweet sorghum seems to be a good alternative for its valorization in Portugal. The purpose of this work was to establish the best experimental conditions for the aerobic bioconversion of this material, starting with different C:N ratios and using different nitrogen sources. The material came from two fields with a fertilization level of 100 kg N/ha, and it was composted using bovine blood, domestic sludge and yeast extract as nitrogen sources, starting with initial C:N ratios of approximately 20 and 30. The experiment was carried out in a constant temperature chamber at 37°C and lasted for two and a half months. Samples were periodically collected and analyzed. The hygienic state of the product was also evaluated. The best quality compost from a fertilizer perspective was obtained with domestic sludge as a nitrogen source and starting from an initial C:N ratio equal to about 20:1. Starting from this C:N ratio could bring problems with the content of cadmium, so the recommended starting conditions must be about 30:1.

Original languageEnglish
Pages (from-to)21-27
Number of pages7
JournalBioresource Technology
Issue number1
Publication statusPublished - 1995


  • bovine rumen
  • C:N ratio
  • Composting
  • nitrogen source
  • quality
  • sweet sorghum


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