BNF from legumes increases the biological efficiency of crop production through direct additions of N to the soil system, and through many indirect benefits associated with perennial cropping and pasturing. Farm economics are improved when some N can be supplied through BNF; this is especially important in those areas of the world where indigenous soil N has been "mined". The role of BNF will increase in the future as farmers in industrialized nations adopt more ecologically-friendly farming systems.

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