Data/hora: 01/06/2024 18:28:02

Provedor de dados: 	Scientia Agricola	
País: 	Brazil	
Título: 	Soil organic matter as a function of nitrogen fertilization in crop successions	
Autores: 	Yagi,Renato; Ferreira,Manoel Evaristo; Cruz,Mara Cristina Pessôa da; Barbosa,José Carlos; Araújo,Luiz Alberto Navarro de.	
Data: 	2005-08-01	
Ano: 	2005	
Palavras-chave: 	Humic acids; Humin; Urea; Corn; Soybean.	
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.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000400011	
Editor: 	São Paulo - Escola Superior de Agricultura "Luiz de Queiroz"	
Relação: 	10.1590/S0103-90162005000400011	
Formato: 	text/html	
Fonte: 	Scientia Agricola  v.62 n.4 2005	
Fonte: 	info:eu-repo/semantics/openAccess