Post by lavender1 on May 22, 2013 8:56:38 GMT -5
library.wur.nl/isric/fulltext/isricu_i26803_001.pdf
www.goodplanet.info/eng/Pollution/Soils/Soil-degradation
thinkbrigade.com/rio20/chemical-fertilizer-impedes-development-of-african-agriculture/
www.spiegel.de/wissenschaft/natur/landwirtschaft-einsatz-von-duenger-in-afrika-zerstoert-boeden-a-901242.html
link.springer.com/chapter/10.1007/978-94-011-3224-4_19#page-1
books.google.de/books?hl=de&lr=&id=0oP_0c-MjNEC&oi=fnd&pg=PA7&dq=chemical+fertilizers+destroys+africa%27s+soil&ots=zCKH9yKpB4&sig=con_PYjvyP7YKRnTJyuJXfFhiSY#v=onepage&q=chemical%20fertilizers%20destroys%20africa%27s%20soil&f=false
www.goodplanet.info/eng/Pollution/Soils/Soil-degradation
thinkbrigade.com/rio20/chemical-fertilizer-impedes-development-of-african-agriculture/
www.spiegel.de/wissenschaft/natur/landwirtschaft-einsatz-von-duenger-in-afrika-zerstoert-boeden-a-901242.html
link.springer.com/chapter/10.1007/978-94-011-3224-4_19#page-1
books.google.de/books?hl=de&lr=&id=0oP_0c-MjNEC&oi=fnd&pg=PA7&dq=chemical+fertilizers+destroys+africa%27s+soil&ots=zCKH9yKpB4&sig=con_PYjvyP7YKRnTJyuJXfFhiSY#v=onepage&q=chemical%20fertilizers%20destroys%20africa%27s%20soil&f=false