Data/hora: 10/06/2024 14:11:05

Provedor de dados: 	86	
País: 	Brazil	
Título: 	Urea and sugarcane straw nitrogen balance in a soil-sugarcane crop system	
Autores: 	Gava,Glauber José de Castro; Trivelin,Paulo Cesar Ocheuze; Vitti,André Cesar; Oliveira,Mauro Wagner de.	
Data: 	2005-07-01	
Ano: 	2005	
Palavras-chave: 	N recovery; Fertilizer-15N; Crop residue; Mineralization; Nitrogen use efficiency.	
Resumo: 	The objectives of this study were to evaluate nitrogen utilization by sugarcane ratoon from two sources, applied urea and sugarcane straw covering soil surface (trash blanket), besides the recovery of N from both sources in the soil-plant system. The following treatments were established in a randomized block design with four replicates: T1, vinasse-urea (100 kg ha-1 of urea-N) mixture applied on the total area of the soil covered with cane trash labeled with 15N; T2, vinasse-urea mixture (urea labeled with 15N; 100 kg ha-1 of urea-N) applied on the total area of the soil covered with non-labeled sugarcane trash; and T3, urea-15N (100 kg ha-1 of urea-N) applied in furrows at both sides of cane rows, with previous surface application of vinasse, onto soil without trash covering. The vinasse was applied at a rate of 100 m³ ha-1 in all treatments. The experiment was carried out on a Yellow Red Podzolic soil (Paleudalf), from October 1997 to August 1998, in Piracicaba, SP, Brazil. The nitrogen use efficiency of urea by the sugarcane ratoon was 21%, while that of the sugarcane straw was 9%. The main contributions of N from sugarcane trash, during one cycle, are the preservation and increase of the organic N in soil. The tendency for a lower accumulation of urea-N in the sugarcane plant, in the soil surface covered with sugarcane residue, was compensated by the assimilation of N from trash mineralization. Nitrogen derived from cane trash was more available to plants in the second half of the ratoon cycle	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2005000700010	
Editor: 	Embrapa Secretaria de Pesquisa e Desenvolvimento

Pesquisa Agropecuária Brasileira	
Relação: 	10.1590/S0100-204X2005000700010	
Formato: 	text/html	
Fonte: 	Pesquisa Agropecuária Brasileira  v.40 n.7 2005	
Fonte: 	info:eu-repo/semantics/openAccess