1993
DOI: 10.1080/09670879309371777
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Red rice(Oryza sativa):Competition studies for management decisions

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Cited by 47 publications
(30 citation statements)
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“…In this case, the hyperbolic model used to fit the data predicted a yield of more than 73% at very high weedy rice density. The recorded yield reduction values are in agreement with the findings of similar studies cited in the literature, even though higher yield losses have been sometimes reported for similar weedy rice densities (Diarra et al, 1985a(Diarra et al, , 1985bKwon et al, 1991a;Fischer and Ramirez, 1993).…”
Section: Discussionsupporting
confidence: 82%
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“…In this case, the hyperbolic model used to fit the data predicted a yield of more than 73% at very high weedy rice density. The recorded yield reduction values are in agreement with the findings of similar studies cited in the literature, even though higher yield losses have been sometimes reported for similar weedy rice densities (Diarra et al, 1985a(Diarra et al, , 1985bKwon et al, 1991a;Fischer and Ramirez, 1993).…”
Section: Discussionsupporting
confidence: 82%
“…In studies conducted in Arkansas, the yield of semi-dwarf cultivar Lemont was already affected at a weed density as low as two plants m -2 (Kwon et al, 1991a). Five and 20 plants m -2 of weedy rice caused a yield loss of 40 and 60%, respectively, in the cultivar Oryzica 1 (Fischer and Ramirez, 1993). Some studies pointed out that competition effects are also closely related to interference duration (Kwon et al, 1991b).…”
Section: Interactions Between Weedy Rice and Cultivated Rice In Italymentioning
confidence: 99%
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“…Dentre as plantas daninhas que infestam a lavoura de arroz destaca-se o arroz-vermelho (Oryza sativa) (Agostinetto et al, 2001), principalmente pela grande dificuldade de controle, uma vez que pertence à mesma espécie do arroz cultivado (Oryza sativa) (Fischer;Ramirez, 1993). Isso limita muito o uso de herbicidas, pois são poucos os que são seletivos para a cultura.…”
Section: Palavras-chaveunclassified
“…Contudo, quando há competição entre indivíduos do mesmo gênero e/ou espécie, a vantagem da cultura poderá ser alterada, uma vez que ambas exploram o mesmo nicho ecoló-gico. Por pertencerem ao mesmo gênero (Vaughan et al, 2001) e, para a maioria dos autores, à mesma espécie (Pantone & Baker, 1991;Ogawa, 1992;Fischer & Ramirez, 1993) Primeiramente, realizou-se experimento preliminar com o cultivar de arroz IRGA 417 em monocultivo, visando determinar a população de plantas em que a produção final de massa seca se torna constante. Neste, foram utilizadas populações de 4, 8, 12, 16, 20, 24, 28 e 32 plantas por vaso (equivalentes a 157, 314, 471, 628, 785, 942, 1.099 e 1.256 plantas m -2 ).…”
Section: Introductionunclassified