Data/hora: 09/06/2024 17:37:33

Provedor de dados: | 90
País: | Brazil
Título: | Cover plants and mineral nitrogen: effects on organic matter fractions in an oxisol under no-tillage in the cerrado
Autores: | Santos,Isis Lima dos; Caixeta,Carla Ferreira; Sousa,Alex Antônio Torres Cortês de; Figueiredo,Cícero Célio de; Ramos,Maria Lucrécia Gerosa; Carvalho,Arminda Moreira de.
Data: | 2014-12-01
Ano: | 2014
Palavras-chave: | Organic carbon; Humic substances; Particulate organic carbon.
Resumo: | Cover plants are essential for the sustainability of no-tillage systems in tropical regions. However, information on the effects of these plants and N fertilization on soil organic matter fractions is still scarce. This study evaluated the effect of cover crops with different chemical composition and of N topdressing on the labile and humified organic matter fractions of an Oxisol of the Cerrado (savanna-like vegetation). The study in a randomized complete block design was arranged in split-plots with three replications. Four cover species were tested in the plots and the presence or absence of N topdressing in the subplot. The following cover species were planted in succession to corn for eight years: Urochloa ruziziensis; Canavalia brasiliensis M. ex Benth; Cajanus cajan (L.) Millsp; and Sorghum bicolor (L.) Moench. In general, the cultivation of U. ruziziensis increased soil C levels, particularly of C in the humic acid and particulate organic C fractions, which are quality indicators of soil organic matter. The C in humic substances and mineral organic C accounted for the highest proportions of total organic C, demonstrating the strong interaction between organic matter, Fe and Al oxides and kaolinite, which are predominant in these weathered soils of the Cerrado.
Tipo: | Info:eu-repo/semantics/other
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000600022
Editor: | Sociedade Brasileira de Ciência do Solo
Relação: | 10.1590/S0100-06832014000600022
Formato: | text/html
Fonte: | Revista Brasileira de Ciência do Solo  v.38 n.6 2014
Fonte: | info:eu-repo/semantics/openAccess