Data/hora: 10/06/2024 09:09:22

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