Título:	Effects of cover crops on the physical protection of organic matter and soil aggregation.
Autoria:	SILVA, A. do N. FIGUEIREDO, C. C. de CARVALHO, A. M. de SOARES, D. dos S. SANTOS, D. C. R. dos SILVA, V. G. da
Afiliação:	ALBERTO DO NASCIMENTO SILVA, UNIVERSIDADE DE BRASÍLIA; CÍCERO CÉLIO DE FIGUEIREDO, UNIVERSIDADE DE BRASÍLIA; ARMINDA MOREIRA DE CARVALHO, CPAC; DAIANE DOS SANTOS SOARES, UNIVERSIDADE DE BRASÍLIA; DIVINA CLÉIA RESENDE DOS SANTOS, UNIVERSIDADE DE BRASÍLIA; VIVIAN GALDINO DA SILVA, UNIVERSIDADE DE BRASÍLIA.
Ano de publicação:	2016
Referência:	Australian Journal of Crop Science, v. 10, n. 12, p. 1623-1629, 2016.
Conteúdo:	The objective of this study was to evaluate the effects of cover crops grown under no-tillage on the aggregation and physical protection of organic matter in soil macro and microaggregates. The experiment consisted of a randomized complete block design with three replications. The following cover crops were investigated in corn rotation systems: T1 = Braquiária ruziziensis (Urochloa ruziziensis), T2 = Canavalia brasiliensis Mart. ex Benth., T3 = Pigeon pea ‘BRS Mandarin’ [Cajanus cajan (L.) Millsp.], T4 = millet ‘BR05’ [Pennisetum glaucum (L.) R.Br.], T5 = turnip-forage (Raphanus sativus L.), T6 = velvet bean (Mucuna aterrima Merr.) and T7 = native Cerrado vegetation as a reference environment. Soil was sampled at a depth of 0-10 cm in September 2015 for the determination of organic matter fractions in macro and microaggregates. There was a reduction in aggregate size and its stability when native Cerrado areas were converted into agricultural systems. Nevertheless, some cover crops such as velvet bean, millet and turnip-forage favored restructuring the soil, forming stable aggregates similar to the native Cerrado. Among the cover crops, millet was highlighted as presenting elevated capacity to accumulate labile organic carbon in macroaggregates (2.32 g C kg-1) and microaggregates (2.34 g C kg-1). These values are, on average, 60% higher than those presented by turnip-forage. In general, the conversion of land use under Cerrado vegetation to agroecosystems reduced the total organic carbon content, mainly due to macroaggregate breakup, resulting in a lower physical protection of soil organic matter.
Thesagro:	Cerrado Carbono Solo Plantio Direto Conservação do solo Matéria orgânica
NAL Thesaurus:	Soil organic carbon No-tillage Organic matter Conservation tillage Soil conservation
Digital Object Identifier:	https://doi.org/10.21475/ajcs.2016.10.12.PNE164
Tipo do material:	Artigo de periódico
Acesso:	openAccess
Aparece nas coleções:	Artigo em periódico indexado (CPAC)