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 language | English |
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Pages (from-to) | 532-541 |
Number of pages | 10 |
Journal | Biology and Fertility of Soils |
Volume | 42 |
Issue number | 6 |
DOIs | |
Publication status | Published - 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