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Nitrogen and carbon mineralisation of different Meliaceae derivatives

Author

Listed:
  • G. Marcolini

    (Departmentof Agricultural Sciences, University of Bologna, Bologna, Italy)

  • M. Toselli

    (Departmentof Agricultural Sciences, University of Bologna, Bologna, Italy)

  • M. Quartieri

    (Departmentof Agricultural Sciences, University of Bologna, Bologna, Italy)

  • P. Gioacchini

    (Departmentof Agricultural Sciences, University of Bologna, Bologna, Italy)

  • E. Baldi

    (Departmentof Agricultural Sciences, University of Bologna, Bologna, Italy)

  • G. Sorrenti

    (Departmentof Agricultural Sciences, University of Bologna, Bologna, Italy)

  • S. Mariani

    (Territorial and Production Systems Sustainability Department, Div. Technology and Methodologies for Safeguarding of Health, ENEA, C.R. Casaccia, Roma, Italy)

Abstract

Among Meliaceae derivatives, neem cake is usually used as a fertilizer; however its origin and industrial processing are often unknown, so that its effect on soil fertility is not predictable. In this study, the effect of soil incorporation of 6 commercial neem cakes and leaves of Melia azedarach L. on nitrogen (N) and carbon (C) dynamics was investigated in a 118-day laboratory incubation experiment. Neem cake at a rate of 8 g/kg of soil and melia leaves at 16 g/kg were incorporated into the soil and their net N and C mineralisation were evaluated 2 h after application and at day 1, 2, 6, 12, 26, 54 and 118, by analysing a 50-g soil sample placed in 250 glass jars. The apparent net N mineralisation was well predicted by N concentration and C/N ratio of derivatives. The derivatives with a C/N ratio < 24 caused a net N mineralisation, whereas those with a C/N ratio ≥ 24 caused net N immobilisation. C mineralisation ranged between 15% and 25% and was not related to chemical composition of the derivative. Neem cake with a C/N ratio < 24 can be used to add N, while neem cake with a C/N ratio > 24 can be used to reduce soil mineral N.

Suggested Citation

  • G. Marcolini & M. Toselli & M. Quartieri & P. Gioacchini & E. Baldi & G. Sorrenti & S. Mariani, 2016. "Nitrogen and carbon mineralisation of different Meliaceae derivatives," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 62(3), pages 121-127.
    • Handle: RePEc:caa:jnlpse:v:62:y:2016:i:3:id:637-2015-pse
    DOI: 10.17221/637/2015-PSE
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