Potassium application reduces methane emission from a flooded field planted to rice

Y. Jagadeesh Babu, Dali Rani Nayak, T. K. Adhya

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Abstract

In a field study, potassium (K) applied as muriate of potash (MOP) significantly reduced methane (CH4) emission from a flooded alluvial soil planted to rice. Cumulative emission was highest in control plots (125.34 kg CH4 ha(-1)), while the lowest emission was recorded in field plots receiving 30 kg K ha(-1) (63.81 kg CH4 ha(-1)), with a 49% reduction in CH4 emission. Potassium application prevented a drop in the redox potential and reduced the contents of active reducing substances and Fe2+ content in the rhizosphere soil. Potassium amendment also inhibited methanogenic bacteria and stimulated methanotrophic bacterial population. Results suggest that, apart form producing higher plant biomass (both above- and underground) and grain yield, K amendment can effectively reduce CH4 emission from flooded soil and could be developed into an effective mitigation option, especially in K-deficient soils.

Original languageEnglish
Pages (from-to)532-541
Number of pages10
JournalBiology and Fertility of Soils
Volume42
Issue number6
DOIs
Publication statusPublished - Aug 2006

Keywords

  • methane emission
  • rice paddy
  • potassium nutrition
  • soil reduction
  • mitigation option
  • nitrous-oxide emissions
  • CH4 emissions
  • lowland rice
  • paddy soils
  • alluvial soil
  • rhizosphere
  • reduction
  • oxidation
  • redox
  • fertilizers

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