Efeitos de ácido ferúlico em interações com densidades de soja e caruru

Soybean and redroot pigweed density interactions as affected by ferulic acid

Efeitos de ácido ferúlico em interações com densidades de soja e caruru

Soybean and redroot pigweed density interactions as affected by ferulic acid

Elemar Voll

Pesquisador da EMBRAPA/CNPSo, Caixa Postal 1061, CEP 86001-970, Londrina, PR

RESUMO

Um experimento foi conduzido sob condições de casa-de-vegetação com o objetivo de avaliar os efeitos de ácido ferúlico (ácido 4-hidróxi-3-metóxi-t-cinâmico) sobre combinações de densidade de soja [Glycine max (L.) Merr. cv. Bragg] com caruru (Amaranthus retroflexus L.) num modelo substitutivo de competição. As proporções de plantas de soja para caruru estabelecidas por vaso foram de 4:0, 3:2, 2:4, 1:6 e 0:8. As doses de ácido ferúlico foram de zero, 500 e 1000 ppm. O delineamento experimental foi o de blocos ao acaso, com quatro repetições. A duração do experimento foi de 33 dias. Houve atraso de dois e três dias na emergência da soja, nas doses de 500 e 1000 ppm de ácido ferúlico, respectivamente. A altura das plantas de soja aumentou nas menores proporções de soja: caruru e com doses crescentes de ácido ferúlico, observando-se o oposto para o caruru. Reduções na biomassa seca por planta da parte aérea e das raízes de soja foram observadas com aumentos de proporção de plantas de soja, ao contrário do caruru. Doses crescentes de ácido ferúlico reduziram a biomassa seca da parte aérea por planta de caruru, reduzindo a produção total relativa. A competição intra-específica em cultura pura foi maior em soja do em caruru. A soja foi mais competitiva que caruru até os 33 dias após o plantio. Ácido ferúlico afetou a competitividade de caruru em maior grau do que a soja.

Palavras-chave: Glycinemax Amaranthus retroflexus, alelopatia, interferência

ABSTRACT

A replacement series experiment under greenhouse conditions was carried out to evaluate the effects of ferulic acid (4-hydroxy-3-methoxy-t-cinnamic acid) on soybean [Glicine max (L.) Merr. cv. Bragg] and redroot pigweed (Amaranthus retroflexus L.) plant density combinations. Soybeans and redroot pigweed were combined at 4:0, 3:2, 2:4, 1:6 and 0:8 plants per pot. Ferulic acid dosages used were zero, 500 and 1000 ppm. A randomized block design with four replications was used. The duration of the experiment was 33 days. For ferulic acid dosages of 500 and 1000 ppm, delays in soybean emergence of 2 and 3 days respectively were observed. Soybean plant height was increased at lower soybean: pigweed rates and at higher ferulic acid dosages; the opposite was observed in pigweed. Soybean shoot and root dry weights decreased as the number of soybeans plants increased, in contrast to pigweed. Higher doses of ferulic acid reduced shoot dry weight and relative total yield of pigweed. Intraspecific competition in pure stands was higher for soybeans than pigweed. Soybeans were more competitive than pigweed up to the harvest time at 33 days. Ferulic acid affected redroot pigweed competitiveness to a much higher degree than that of soybeans.

Additional index words: Glycine max, Amaranthus retroflexus, allelopathy, interference.

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LITERATURA CITADA

Recebido para publicação em 21/03/93 e na forma revisada em 20/06/93.

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Datas de Publicação

• Publicação nesta coleção
  16 Maio 2012
• Data do Fascículo
  1993

Histórico

• Recebido
  21 Mar 1993
• Revisado
  20 Jun 1993