| Registro completo |
| Provedor de dados: |
Scientia Agricola
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| País: |
Brazil
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| Título: |
Soil organic matter as a function of nitrogen fertilization in crop successions
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| Autores: |
Yagi,Renato
Ferreira,Manoel Evaristo
Cruz,Mara Cristina Pessôa da
Barbosa,José Carlos
Araújo,Luiz Alberto Navarro de
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| Data: |
2005-08-01
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| Ano: |
2005
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| Palavras-chave: |
Humic acids
Humin
Urea
Corn
Soybean
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| Resumo: |
The interdependence between the C and N cycles is reflected by the levels of soil organic matter (SOM). SOM and organic C levels in water soluble (C-WS) humic acids (C-HA), fulvic acids (C-FA), and humin fractions (C-H) were evaluated through the classic chemical fractionation method in samples of a Rhodic Eutrudox from a randomized blocks experimental design, with split-split-plots using five nitrogen sidedressing levels for corn (0; 60; 120; 180; and 240 kg ha-1 N) as the main treatment, two crop sequences (corn-corn and soybean-corn) as the secondary treatment, and two sampling depths (0 to 0.2 and 0.2 to 0.4 m) as a sub-subtreatment. Nitrogen fertilization did not affect SOM levels, but favored the synthesis of substances in the C-HA fraction. There was a quadratic effect of N rates on the C-WS and C-FA levels in the corn-corn succession. The soybean-corn succession resulted in larger SOM and organic C levels in the C-H fraction.
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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=S0103-90162005000400011
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| Editor: |
São Paulo - Escola Superior de Agricultura "Luiz de Queiroz"
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| Relação: |
10.1590/S0103-90162005000400011
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| Formato: |
text/html
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| Fonte: |
Scientia Agricola v.62 n.4 2005
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| Direitos: |
info:eu-repo/semantics/openAccess
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