Data/hora: 05/06/2024 02:23:35

Biblioteca(s): 	Embrapa Unidades Centrais.	
Data corrente: 	01/12/2016	
Data da última atualização: 	24/05/2017	
Autoria: 	SEBEN JUNIOR, G. de F.; CORÁ, J. E.; LAL, R.	
Afiliação: 	GETULIO DE FREITAS SEBEM JUNIOR, UEMS; JOSÉ EDUARDO CORÁ, Universidade Estadual Paulista; RATTAN LAL, Ohio State University.	
Título: 	Soil aggregation according to the dynamics of carbon and nitrogen in soil under different cropping systems.	
Ano de publicação: 	2016	
Fonte/Imprenta: 	Pesquisa Agropecuária Brasileira, Brasília, DF, v. 51, n. 9, p. 1652-1659, set. 2016.	
Idioma: 	Inglês	
Notas: 	Título em português: Agregação do solo de acordo com a dinâmica de carbono e nitrogênio em solo sob diferentes sistemas de cultivo.	
Conteúdo: 	The objective of this work was to evaluate total soil carbon and nitrogen, as well as their contents in particulate and mineral-associated C fractions; to determine C stock and sequestration rates in the soil; and to verify the effect of C and N contents on soil aggregation, using different crop rotations and crop sequences under no-tillage. The study was carried out for nine years in a clayey Oxisol. The treatments consisted of different cropping systems formed by the combination of three summer crops (cropped until March) ? corn (Zea mays) monocropping, soybean (Glycine max) monocropping, and soybean/corn rotation ? and seven second crops (crop successions). Soil samples were taken at the 0.00?0.10-m layer for physical fractionation of C and N, and to determine soil aggregation by the wet method. Soybean monocropping increased C and N in particulate C fraction, while the crop systems with corn monocropping x pigeon pea (Cajanus cajan), corn monocropping x sun hemp (Crotalaria juncea), and soybean monocropping x corn as a crop succession increased total C in the soil. Greater rates of soil C sequestration were observed with soybean/corn rotation and with soybean monocropping, as well as with sun hemp as a second crop. The increase in total N increases soil C stock. Soil aggregation was most affected at particulate C fraction. Increases in soil N promote C addition to particulate fraction and enhance soil aggregation.	
Palavras-Chave: 	Agregados do solo; Estoque de carbono; Matéria orgânica do solo; Sequestro de carbono.	
Thesagro: 	Planta de cobertura; Rotação de cultura.	
Thesaurus Nal: 	Carbon sequestration; Carbon sinks; Cover crops; Crop rotation; Soil aggregates; Soil organic matter.	
Categoria do assunto: 	--	
URL: 	http://ainfo.cnptia.embrapa.br/digital/bitstream/item/150937/1/Soil-aggregatiuon-according.pdf	
Registro original: 	Embrapa Unidades Centrais (AI-SEDE)	
Exemplares: 	AI-SEDE - (60246-1) - UPE - AP - PP - 630.72081 - P474 -  - DIS