00598naa a2200241 a 450000100080000000500110000800800410001910000210006024500430008126000090012465000190013365000200015265000140017265000220018665000090020865300150021765300160023265300170024865300160026565300160028170000180029777300410031513685111998-04-28       1961    bl ---       0--  u    #d1 aZIMMERMAN, R. P.  aEffect of bulk density on root growth.  c1961  aorganic matter  asoil compaction  aOxigênio  aSistema Radicular  aSolo  aAggegation  aCompactacao  aConcentracao  aPensilvania  aRoot system1 aKARDOS, L. T.  tSoil Sciencegv.91, p.280-288, 1961.