00512naa a2200145 a 450000100080000000500110000800800410001910000190006024500660007926000090014565000200015465300390017465300360021377301170024920491912016-08-02       1987    bl uuuu     u00u1 u    #d1 aSANCHEZ, P. A.  aSoil productivity and sustainability in agroforestry systems.  c1987  aerosion control  aMaintenance of soil oragnic matter  aSoil constraints in the tropics  tIn: STEPPLER, H. A.; NAIR, P. K. (Ed.). Agroforestry: a decade of development. Nairobi: ICRAF, 1987. p. 205-223.