00955naa a2200181 a 450000100080000000500110000800800410001910000140006024500890007426000090016352004060017265300360057870000200061470000190063470000180065370000150067177300870068610290162005-08-25       2001    bl ---       0--  u    #d1 aBAYER, C.  aChanges in soil organic matter fractions under subtropical no-till cropping systems.  c2001  aConservation management systems increase soil C and N pools. However, their effects on particulate ( &gt 53) and mineral-associated ( &lt53) soil organic matter (SOM) fractions are less understood under subtropical climatic conditions. This study evaluated the long-term (12-yr) effects of three no-till cropping systems [bare soil, BS; oat (Avena strigosa Schreb.) + vetch (Vicia sativa L.)/maize ...  aConservation management systems1 aMARTIN-NETO, L.1 aMIELNICZUK, J.1 aPILLON, C. N.1 aSANGOI, L.  tSoil Science Society of America Journal, Madisongv. 65, n. 5, 2001. p. 1473-1478.