efeitos de sistemas de manejo sobre a população de tiririca effects of management systems on purple nutsedge populations (cyperus rotundus)

Clicks: 307
ID: 209122
2003
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Abstract
Em experimento conduzido em campo, de novembro de 1998 a maio de 2001, sobre Argissolo Vermelho-Amarelo Câmbico de alta fertilidade, em Viçosa-MG, foram avaliados os efeitos de sistemas de manejo do solo na população de tiririca (Cyperus rotundus). Na área experimental, antes da instalação do experimento predominava infestação alta (720 ± 130 plantas m-2) de tiririca. Os tratamentos foram constituídos de dois sistemas de manejo do solo (plantios convencional e direto) e duas finalidades de uso da cultura do milho (grão e silagem), cultivados com feijão de outono-inverno em sucessão à cultura do milho, em blocos com quatro repetições. No plantio convencional, antes da semeadura das culturas, o solo foi arado e gradeado, e, no plantio direto, foi realizada a dessecação das plantas daninhas com glyphosate + 2,4-D. As avaliações das manifestações epígeas da tiririca na cultura do milho ocorreram aos 20 e 55 dias após a emergência (DAE) no ano agrícola 1999/00 e aos 20 DAE em 2000/01 e, para o feijoeiro, aos 20 e 40 DAE. A avaliação do banco de tubérculos foi realizada após a colheita do milho, no último ano de condução, determinando-se a densidade, a biomassa e a porcentagem de brotação dos tubérculos coletados. Verificou-se redução das manifestações epígeas da tiririca no sistema de plantio direto em ambas as finalidades de uso da cultura do milho durante todo o período de condução do ensaio. Tanto no milho cultivado para grão quanto para silagem, constatou-se elevada redução do banco de tubérculos no plantio direto, com predomínio de tubérculos dormentes, em relação ao plantio convencional.
A field experiment was conducted from November, 1998 to May, 2001 in a Cambic Yellow Red Argisol soil, with high fertility, in Viçosa, MG. The objective of this study was to evaluate the effects of soil management systems on purple nutsedge (Cyperus rotundus) populations. A high (720 ± 130 plants m-2) nutsedge infestation prevailed in the experimental area before the installation of the experiment. The treatments consisted of two soil management systems (conventional and no-tillage) and two corn use purposes (grain and silage) cultivated with autumn-winter beans in succession to corn, in blocks with four replications. Under conventional tillage, the soil was moldboard plowed before planting, and under no-tillage, weed desiccation was carried out with glyphosate + 2,4-D. The purple nutsedge population evaluations in the corn crop occurred at 20 and 55 days after emergence (years 1999/00) and at 20 days after emergence (years 2000/01), and in the beans crop at 20 and 40 days after emergence. The tuber bank was evaluated after corn harvest, during the last year, by determining density, biomass and percentage of sprouting of the sampled tubers. There was a reduction of purple nutsedge populations in no-tillage systems in both corn use purposes throughout the experiment. For both corn use purposes (grain or silage), there was a reduction in the tuber bank under no-tillage, with dormancy prevailing in comparison to conventional tillage.
Reference Key
jakelaitis2003plantaefeitos Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;A. Jakelaitis;L.R. Ferreira;A.A. Silva;E.L. Agnes;G.V. Miranda;A.F.L. Machado
Journal anti-cancer agents in medicinal chemistry
Year 2003
DOI
10.1590/S0100-83582003000100011
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582003000100011
Keywords
cyperus rotundus herbicides

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