Data/hora: 20/06/2024 03:23:51

Biblioteca(s): 	Embrapa Unidades Centrais.	
Data corrente: 	25/08/2005	
Data da última atualização: 	20/08/2018	
Autoria: 	GAVA, G. J. de C.; TRIVELIN, P. C. O.; VITTI, A. C.; OLIVEIRA, M. W. de.	
Afiliação: 	Glauber José de Castro Gava, Agência Paulista de Tecnologia dos Agronegócios - Apta; Paulo Cesar Ocheuze Trivelin, Universidade de São Paulo - Usp/Centro de Energia Nuclear na Agricultura - Cena; André Cesar Vitti, Universidade de São Paulo - Usp/Centro de Energia Nuclear na Agricultura - Cena; Mauro Wagner de Oliveira, Universidade Federal de Alagoas - UFAL.	
Título: 	Urea and sugarcane straw nitrogen balance in a soil-sugarcane crop system.	
Ano de publicação: 	2005	
Fonte/Imprenta: 	Pesquisa Agropecuária Brasileira, Brasília, DF, v. 40, n. 7, p. 689-695, jul. 2005	
Idioma: 	Inglês	
Notas: 	Título em português: Balanço do nitrogênio da uréia e da palha de cana no sistema solo-cana-de-açúcar.	
Conteúdo: 	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.	
Palavras-Chave: 	crop residue; eficiência de uso de nitrogênio; fertilizante-15N; fertilizer-15N; N recovery; nitrogen use efficiency; recuperação de N; resíduo de colheita.	
Thesagro: 	Mineralização.	
Thesaurus Nal: 	mineralization.	
Categoria do assunto: 	--	
URL: 	http://ainfo.cnptia.embrapa.br/digital/bitstream/item/107723/1/Urea.pdf	
Registro original: 	Embrapa Unidades Centrais (AI-SEDE)	
Exemplares: 	AI-SEDE - (32385-1) - UPE - AP - PP - 630.72081 - P474 -  - DIS