| Registro completo |
| Provedor de dados: |
PAB
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| País: |
Brazil
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| Título: |
Soil aggregation according to the dynamics of carbon and nitrogen in soil under different cropping systems
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| Autores: |
Seben Junior,Getulio de Freitas
Corá,José Eduardo
Lal,Rattan
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| Data: |
2016-09-01
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| Ano: |
2016
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| Palavras-chave: |
Carbon sequestration
Carbon stocks
Cover crops
Crop rotation
Soil aggregates
Soil organic matter
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| Resumo: |
Abstract 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.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2016000901652
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| Editor: |
Embrapa Secretaria de Pesquisa e Desenvolvimento
Pesquisa Agropecuária Brasileira
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| Relação: |
10.1590/s0100-204x2016000900065
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| Formato: |
text/html
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| Fonte: |
Pesquisa Agropecuária Brasileira v.51 n.9 2016
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| Direitos: |
info:eu-repo/semantics/openAccess
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