2006
DOI: 10.2134/jeq2005.0233
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Abstract: The area under no-till (NT) in Brazil reached 22 million ha in 2004-2005, of which approximately 45% was located in the southern states. From the 1970s to the mid-1980s, this region was a source of carbon dioxide to the atmosphere due to decrease of soil carbon (C) stocks and high consumption of fuel by intensive tillage. Since then, NT has partially restored the soil C lost and reduced the consumption of fossil fuels. To assess the potential of C accumulation in NT soils, four long-term experiments (7-19 yr) … Show more

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Cited by 135 publications
(90 citation statements)
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“…The introduction of legumes in grass-based cropping systems has been reported to increase the availability of N for non-N fixing crops and to increase yields (Da Ros and Aita, 1996;Amado et al, 2006;Weber and Mielniczuk, 2009). Moreover, summer legumes such as cowpea, pigeon pea, and lablab can further increase biomass production, in comparison to systems with only a winter legume (vetch).…”
Section: Validationmentioning
confidence: 99%
“…The introduction of legumes in grass-based cropping systems has been reported to increase the availability of N for non-N fixing crops and to increase yields (Da Ros and Aita, 1996;Amado et al, 2006;Weber and Mielniczuk, 2009). Moreover, summer legumes such as cowpea, pigeon pea, and lablab can further increase biomass production, in comparison to systems with only a winter legume (vetch).…”
Section: Validationmentioning
confidence: 99%
“…Soils usually function as a net source of GHG when native lands are converted to conventionally-managed crop fields (Robertson et al, 2000;Mosier et al, 2005). This behaviour is driven by the fast depletion of C stored in soil as organic matter (SOM), as consequence of a negative balance between net C uptake by plants and C losses to atmospheric CO 2 due to the microbial oxidation of soil organic matter (Amado et al, 2006;Bayer et al, 2006). The worst scenario is experienced when conventional tillage practices are associated with low biomass input crop systems or fallow periods, mainly under highly favourable temperature and soil moisture conditions to biological decomposition in humid tropical and subtropical climates (De Bona et al, 2008;Zanatta et al, 2007).…”
Section: Carbon Dynamics After Grassland Conversion To Agriculturementioning
confidence: 99%
“…No-tillage appears as the main practice in conservation agriculture and its favourable effect on soil C balance is very well documented (Amado et al, 2006;Bayer et al, 2006;Bono et al, 2008).…”
Section: Greenhouse Gas Fluxes From Soilmentioning
confidence: 99%
“…The federal government of Brazil has implemented new programmes to reduce deforestation, favouring the reduction of GHG emissions with the expansion of agriculture on degraded land, of which at least 15 million hectares are available (Tollefson, 2010). Other initiatives have been implemented in Brazil, such as the expansion of no-tillage agriculture (cropping performed directly on crop residues without soil tillage) (Amado et al, 2006) and the reduction of sugarcane burning in the southeast (associated with sugarcane harvest), as well as the more rational use of land for agricultural production. Figure 1 presents the spatial distribution of the main agricultural activities in Brazil considering the land use.…”
Section: Introductionmentioning
confidence: 99%