Does incorporation of cowpea-maize residue mixes influence nitrous oxide emission and mineral nitrogen release in a tropical luvisol?

K. A. Frimpong, D. O. Yawson, E. M. Baggs, K. Agyarko

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Abstract

In the face of climate change, quantification of the emission of nitrous oxide from soils in relation to sufficient N availability for crop uptake has assumed much significance. This study used the N-15 stable isotope technique, under controlled laboratory conditions, to quantify the interactive effect on and relative contributions of the component species to N2O emission and mineral N dynamics in a tropical luvisol incorporated with different rates of cowpea-maize residue mixtures. The results show that increasing the maize residue proportion in the mixture significantly decreases N2O emission compared to the sole cowpea incorporation but increases mineral N concentration compared to sole maize residue incorporation. It is concluded that mixing low C:N ratio cowpea residue with high C:N ratio maize residue has potential for N management in tropical legume-cereal intercropping systems with the view to minimizing N2O emission while making N available for crop uptake.

Original languageEnglish
Pages (from-to)281-292
Number of pages12
JournalNutrient Cycling in Agroecosystems
Volume91
Issue number3
DOIs
Publication statusPublished - Dec 2011

Keywords

  • nitrous oxide emission
  • mineral N
  • cowpea-maize residue
  • N-15 stable isotope
  • N2O emissions
  • plant residues
  • humid tropics
  • soil
  • denitrification
  • nitrification
  • management
  • fertilizer
  • upland
  • carbon

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