00780naa a2200205 a 450000100080000000500110000800800410001910000190006024501380007926000090021752001800022665000090040665000130041565000190042865000230044765000090047070000190047970000230049877300530052111575892017-02-22       1987    bl ---       0--  u    #d1 aPOWLSON, D. S.  aMeasurement of soil microbial biomass provdes an early indication of changes in total soil organic matter due to straw incorporation.  c1987  aThe straw and stubble of spring barley (Hordeum vulgare; 5t dry matter ha) were either burned or incorporated into soil annually for 18 yr in two field experiments in Denmark.  aSoil  aBiomassa  aIncorporação  aMatéria Orgânica  aSolo1 aBROOKES, P. C.1 aCHRISTENSEN, B. T.  tSoil Biol. Biochem.gv.19, n.2, p.159-164, 1987.