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Nutrição em nitrogênio do capim Marandu submetido a doses de nitrogênio e idades de crescimento

Authors: João de Deus Gomes Santos Junior; Francisco Antonio Monteiro;

Nutrição em nitrogênio do capim Marandu submetido a doses de nitrogênio e idades de crescimento

Abstract

Objetivou-se neste trabalho avaliar a produção de massa seca, concentração crítica e de nitrogênio total, relacionadas às unidades SPAD nas lâminas de folhas recém-expandidas do capim Marandu (Brachiaria brizantha cv. Marandu) quando submetido a doses de nitrogênio de 28, 112, 210, 294 e 378 mg L-1 e idades de crescimento de 21, 28, 35, 42, 49 e 56 dias após a emergência. O experimento foi conduzido em casa-de-vegetação, com solução nutritiva, utilizando sílica como substrato. Utilizou-se o delineamento de blocos completos ao acaso, em esquema fatorial, com quatro repetições. As doses de nitrogênio e as idades de crescimento interagiram significativamente em todos os atributos estudados no capim-Marandu. As doses de nitrogênio necessárias para a obtenção da máxima produção de massa seca variaram entre 257 e 304 mg L-1. A concentração crítica de nitrogênio determinada nas lâminas de folhas recém-expandidas foi influenciada significativamente pelas idades de crescimento e variou entre os valores de 33,8 e 12,8 g kg-1 . Os valores SPAD correspondentes às concentrações críticas de nitrogênio estiveram entre 45 e 50, quando as idades de crescimento eram de 21 a 49 dias.

Keywords

SPAD, Brachiaria brizantha, adubação nitrogenada, SF1-1100, adubação nitrogenada, Animal culture

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
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