00605naa a2200193 a 450000100080000000500110000800800410001910000190006024501440007926000090022365000190023265000150025165000090026665300140027565300250028970000160031470000130033077300680034318406242010-01-10       1980    bl ---       0--  u    #d1 aDOUGLAS, J. T.  aMeasurements of pore characteristics in a clay soil under ploughing and direct drilling, including use of a radioactive (144 Ce) technique.  c1980  aPlantio Direto  aPorosidade  aSolo  aDensidade  aPreparo Convencional1 aGOSS, M. J.1 aHILL, D.  tSoil & Tillage Research, Amsterdamgv. 1, n. 1, p. 11-18, 1980.