| Registro completo |
| Provedor de dados: |
PAB
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| País: |
Brazil
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| Título: |
Urea and sugarcane straw nitrogen balance in a soil-sugarcane crop system
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| Autores: |
Gava,Glauber José de Castro
Trivelin,Paulo Cesar Ocheuze
Vitti,André Cesar
Oliveira,Mauro Wagner de
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| Data: |
2005-07-01
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| Ano: |
2005
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| Palavras-chave: |
N recovery
Fertilizer-15N
Crop residue
Mineralization
Nitrogen use efficiency
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| 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
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2005000700010
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| Editor: |
Embrapa Secretaria de Pesquisa e Desenvolvimento
Pesquisa Agropecuária Brasileira
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| Relação: |
10.1590/S0100-204X2005000700010
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| Formato: |
text/html
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| Fonte: |
Pesquisa Agropecuária Brasileira v.40 n.7 2005
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| Direitos: |
info:eu-repo/semantics/openAccess
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