Adubação nitrogenada em braquiarão: decomposição da fitomassa e liberação de nutrientes
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Data
2016-06
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Editor
Evandro Novaes
Resumo
Topdressing or pre-seeding nitrogen (N) application
increases phytomass production, providing a higher nutrients
accumulation and indirectly favoring the subsequent crop.
However, N fertilization can alter the dry matter decomposition
and nutrients release dynamics. This study aimed at evaluating
the decomposition rate, cellulose, lignin and nutrients release
speed from palisadegrass as a function of N fertilization.
The experimental design was randomized blocks with four
replications, in a factorial scheme constituted by two N
fertilization levels and six sampling times after desiccation
[0, 14, 34, 41, 51 and 68 days after management (DAM)].
The topdressing N fertilization on palisadegrass increases the
dry matter production and N accumulation, but does not alter
the decomposition and release speed. N fertilization reduces
the C/N ratio, but it does not change the contents of cellulose
and lignin and the decomposition and release of N, K, Ca,
Mg, C and Si. The amounts of P and S accumulated in the
plant and released into the soil increase with N fertilization.
The maximum release rates occur within 0-14 DAM, being
more intensive for P and S when N is applied. These results
demonstrate the high potential of this species for croplivestock
integration systems, with some advantages that can
be potentialized with higher N doses.
Descrição
Palavras-chave
Urochloa brizantha, Celulose, Lignina, Persistência de palhada, Reciclagem de nutrientes, Cellulose, Lignin, Straw persistence, Nutrients recycling
Citação
COSTA, Claudio Hideo Martins da; CRUSCIOL, Carlos Alexandre Costa; SORATTO, Rogério Peres; FERRARI NETO, Jayme; MORO, Edemar. Adubação nitrogenada em braquiarão:decomposição da fitomassa e liberação de nutrientes. Pesquisa Agropecuária Tropical, Goiânia, v. 46, n. 2, p. 159-168, abr./jun. 2016. Disponível em: <https://www.revistas.ufg.br/pat/article/view/39297/21206>.