00345nam a2200145 a 450000100080000000500110000800800410001910000210006024500390008126000410012030000100016165000090017165000090018065300100018918464491992-10-14       1989    bl uuuu     u0uu1 u    #d1 aGUTTERRES, J. F.  aDisponibilidade de boro nos solos.  a[Porto Alegre]: UFRGS, [198-].c1989  a12 p.  aBoro  aSolo  aUFRGS