Methane is formed during the growing season in the flooded soils of rice fields. Present knowledge indicates that various cultivation practices could potentially achieve significant reductions. These include cultivar selection, water management and nutrient application and soil management. Potentially, a reduction of 30 per cent in CH4 emissions from typical rice regions can be achieved with low costs. In other regions, a 5 per cent reduction may be possible by 2025. The costs are low if water is abundant with a cost of ~$5 per tonne of avoided CH4 (Byfield et al, 1997).
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