,the US is the world's leading producer and exporter of phosphate fertilizers, accounting for about 37 % of world P 2 O 5 exports ., the world s total economic demonstrated resource of rock phosphate is 18 gigatonnes, which occurs principally as sedimentary marine phosphorites.
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An example of green manure use comes from Nigeria, where the cover crop " Mucuna pruriens " ( velvet bean ) has been found to increase the availability of phosphorus in soil after a farmer applies rock phosphate ( Vanlauwe " et al . " 2000 ).
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As director of the International Centre for Research in Agroforestry in Nairobi, Sanchez developed a method to replenish soil with nutrients from local rock phosphate and by planting trees on cropland, helping the poorest farmers fertilize their soils naturally without using expensive chemical fertilizers that can cause environmental damage.
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