02381naa a2200289 a 450000100080000000500110000800800410001902400480006010000180010824501740012626000090030052014550030965000150176465000190177965000190179865000190181765000290183665000240186565000230188965000190191265000090193165300130194070000210195370000280197470000220200277300670202421259362020-11-17       2020    bl uuuu     u00u1 u    #d7 ahttps://doi.org/10.5296/jas.v8i3.159882DOI1 aBRASIL, E. C.  aChanges in carbon stocks and chemical attributes of an oxisol as a result of adoption period of no-tillage system in the brazilian Eastern Amazon.h[electronic resource]  c2020  aThe conversion of forest areas to grain cropping has promoted a decrease in soil organic matter stocks in the Amazon. This processis most striking when the conventional cultivation system is used. In order to evaluate the changes in soil carbon and nutrient stocks resulting from the time of adoption of the no tillage system in a dystrophic Yellow Oxisolof the Brazilian Amazon biome, a study was conducted in a grain producingarea in the northeastern of Pará, Brazil.The treatmentscorresponded to the following systems: CT6-conventional tillage system with six years of implementation; No-tillage system with 3 (NT3), 4 (NT4) and 7 (NT7) years of implementation. All systems were always cultivated in corn / soybean rotation. Deformed and non-deformed soil samples were collected on a the 2013 crop year at 0-10, 10-20 and 20-40 cm depths. Stocks of carbon (SC) and phosphorus (P), potassium (K), calcium (Ca) and magnesium (Mg) were calculated by using the equivalent soil mass methodology. Regardless of depth, theNTshowed higher SCvalues than the CT. The adoption of NTshowed a tendency of increasing SCof the soil over time. Such increases were up to 36% of the NT7 compared to theCT6. In NT7, the stocks of K, Ca and Mg were higher in relation to PC6. The EC correlated positively with the stocks of K, Ca and Mg in the areas under NT, regardless of the time of system adoption, up to 40 cm deep, indicating improvementsin the soil fertility.  aNo-tillage  aOrganic matter  aSoil fertility  aSoil nutrients  aAbsorção de Nutrientes  aFertilidade do Solo  aMatéria Orgânica  aPlantio Direto  aSolo  aAnoxisol1 aDANTAS, R. C. R.1 aSILVA JÚNIOR, M. L. da1 aFREITAS, L. de S.  tJournal of Agricultural Studiesgv. 8, n. 3, p. 106-124, 2020.