LAUSR

Abstract No-tillage (NT) management has been one of the significant advances in Brazilian agriculture to enhance sustainability. However, weathered soils are acidic and may require amelioration to become more productive. Our objective was to determine the influence of surface application of different sources of soil acidity amendment under NT with different cover crops on soil carbon (C) and nitrogen (N) fractions, soil organic C stock, and soil physical attributes in a clayey Typic Hapludox in Botucatu, Sao Paulo State, Brazil. A randomized block design was repeated from 2007 to 2013 with main plots of cover crop type (forages, grain, annual grass, and fallow) and split plots of soil acidity amendment (no amendment, limestone, and silicate applied in 2006 and 2011). In 2013, soil was collected at 0–0.05, 0.05–0.1 and 0.1–0.2 m depths. Several soil C and N fractions and micro-porosity were greater (p