Data/hora: 04/06/2024 08:09:40

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