Value added products - Marine Harvest. Trees 'boost African crop yields and food security' 16 October 2011Last updated at 01:28 By Mark Kinver Environment reporter, BBC News The nitrogen-fixing roots of certain trees provide valuable nutrients to resource-poor arable land Planting trees that improve soil quality can help boost crop yields for African farmers, an assessment shows.
Fertiliser tree systems (FTS) also help boost food security and play a role in "climate proofing" the region's arable land, the paper adds. 7 billion people and you: What's your number? Sources: All population data are based on estimates by the UN Population Division and all calculations provided by the UN Population Fund.
The remaining data are from other sections of the UN, the Global Footprint Network and the International Telecommunications Union.