Períodos de interferência das plantas daninhas na cultura de cebola (Allium cepa) transplantada

Soares, Daniel Jorge; Pitelli, Robinson Antônio; Braz, Leila Trevisan; Gravena, R.; Toledo, Roberto

doi:10.1590/s0100-83582003000300006

Cited by 31 publications

(30 citation statements)

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“…Normalmente, a comunidade infestante apresenta grande riqueza de espécies, principalmente em áreas de cultivo intensivo, com alta mobilização do solo, características de cultivos de hortaliças. Entretanto, poucas espécies são as mais frequentes e aquelas que causam mais prejuízos às culturas (Soares et al, 2003(Soares et al, , 2004 Eleusine indica e P. oleraceae são espécies tipicamente ruderais, de acordo com critérios de Grime (1979). Espécies ruderais são especializadas na colonização de áreas em que, de alguma maneira, a vegetação natural foi removida (Costa & Durigan, 2010), apresentando rápida germinação, curto ciclo de desenvolvimento, rápida produção de diásporos e elevada partição de recursos nas estruturas de reprodução (Carneiro & Irgang, 2005).…”

Section: Resultsunclassified

Períodos de interferência de plantas daninhas na cultura do quiabo

Bachega¹,

Carvalho

Bianco

et al. 2013

Planta daninha

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63Períodos de interferência de plantas daninhas na cultura do quiabo 1 Recebido para publicação em 15.4.2012 e aprovado em 2/9/2012. RESUMO -Poucas pesquisas têm sido realizadas sobre interferência de plantas daninhas na cultura do quiabo. Objetivou-se com este trabalho estimar os períodos de interferência da comunidade infestante no quiabeiro. Um experimento de campo foi conduzido sob dois grupos de tratamentos, mantendo períodos crescentes de 0 (testemunha), 7, 21, 28, 35, 42, 49, 63, 77, 91 e 105 dias após a emergência da cultura (DAE), com e sem controle das plantas daninhas. As plantas daninhas com maior importância relativa foram Portulaca oleracea, Nicandra physaloides e Eleusine indica. A convivência do quiabeiro com as plantas daninhas por todo o ciclo de cultivo reduziu a produtividade da cultura em 95%. O período anterior à interferência foi de 57 DAE, enquanto o período total de prevenção à interferência foi de 14 DAE. Não houve período crítico de prevenção à interferência, sendo um único controle das plantas daninhas entre 14 e 57 DAE suficiente para prevenir a interferência na cultura do quiabo.Palavras-chave: Abelmoschus esculentus, comunidade infestante, convivência, competição.ABSTRACT -Few research works have been carried out on weed interference in okra crop. The aim of this study was to estimate the periods of weed interference in okra crop. Thus, a field trial was carried out under two groups of treatments, using increased periods of 0 (check), 7, 21, 28, 35, 42, 49, 63, 77, 91, and 105 days after crop emergence (DAE) with weed control and without weed control. Weeds with highest relative importance were Portulaca oleracea, Nicandra physaloides, and Eleusine indica. Coexistence of okra crop and weeds throughout the season reduced crop yield by 95%. The period before interference was 57 DAE, while total period of interference prevention was 14 DAE. There was no critical period of interference prevention, with a single weed control between 14 and 57 DAE being sufficient for interference prevention in okra crop.

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Section: Resultsunclassified

Períodos de interferência de plantas daninhas na cultura do quiabo

Bachega¹,

Carvalho

Bianco

et al. 2013

Planta daninha

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“…In the last years, the species has been reported infesting horticulture and field crops such as cotton (Corrêa & Sharma, 2004), papaya (Ronchi et al, 2008), onion (Soares et al, 2003(Soares et al, , 2004, peanut (Nepomuceno et al, 2007a;Dias et al, 2009), potato (Blanco, 2008), red beet (Carvalho et al, 2008a,b;Carvalho & Guzzo, 2008), soybean (Nepomuceno et al, 2007b), sugar cane (Kuva et al, 2007;Monquero et al, 2008), tomato (Nascente et al, 2004;Hernandez et al, 2007) and watermelon (Adkins et al, 2008;Gilbert et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Growth and mineral nutrition of Solanum americanum

2010

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A greenhouse trial was carried out from November 1995 to April 1996 at FCAV/UNESP, Brazil, aiming to study the dry matter production and the accumulation and distribution of macronutrients in Solanum americanum, an important weed for annual and perennial crops in Brazil. The plants were grown in seven liter pots with sand substrate, irrigated daily with Hoagland & Arnon nutrient solution. The experimental design was completely randomized with four replicates. The treatments corresponded to evaluation times at 14 day intervals, beginning 21 days after emergence (DAE). In each evaluation, the plants of four pots were analyzed for dry matter production and macronutrient content. S. americanum had a small dry matter and macronutrient accumulation at the beginning of the experimental stage, increasing after 77 DAE and reaching the maximum theoretical value at 142, 142, 164, 149, 140, 149 and 152 DAE, for dry matter, N, P, K, Ca, Mg, and S, respectively. K and N were the most accumulated macronutrients for S. americanum plants.

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“…Weed density begins to increase in the beginning of the corn development cycle; without weed control, weed density peaks at about 28 days after corn seeding (Ramos & Pitelli, 1994). From then on, density begins to decrease (Ramos & Pitelli, 1994), due to the end of the cycle for some individuals and to marked mortality of others, caused by intense competition (Soares et al, 2003).…”

Section: Resultsmentioning

confidence: 99%

Effects of weed "Reestablishment" after hoeing on corn yields

Silva

Oliveira

et al. 2010

Planta daninha

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Some growers and researchers sustain the idea that regrowth or root setting of some weeds may occur after hoeing, with detrimental effects over corn. The objective of this study was to evaluate the effects of weed removal from the field, removal after each hoeing, and corn intercropped with gliricidia on weed control and corn yield values. The experimental design consisted of blocks with split-plots and six replicates. Cultivars AG 1051 and BM 2022, planted in the plots, were submitted to the following treatments: no hoeing, two hoeings (at 20 and 40 days after planting), and intercropped with gliricidia. The hoed plots were either submitted to weed removal after the first, second, or both hoeings, or remained without weed removal. In the intercropped treatment, gliricidia was sown by broadcasting at corn planting between the corn rows, at a density of 15 seeds m-2. Twenty-five weed species occurred in the experiment; the most frequent was Digitaria sanguinalis (family Poaceae). The weed control methods tested had similar effects on the cultivars, which were not different from one another with respect to the evaluated traits, except for one-hundred-kernel weight, with cultivar AG 1051 being superior. Weed removal did not influence green corn yield or grain yield. However, the number of kernels/ear was higher in plots where weeds were removed in relation to plots without weed removal, suggesting that weed removal might be beneficial to corn. Besides, a higher dry matter weight was obtained for the above-ground part of weeds removed from the field after the first and second hoeings than the weight of weeds removed after the second hoeing only which, in turn, was higher than the weight of weeds removed after the first hoeing only. Green ear yield, grain yield, and dry matter of the above-ground part of the weeds did not show differences in hoed plots and were superior to the non-weeded plots and the intercropped plots, which were not different from each other; therefore, intercropping with gliricidia did not improve corn yield values.

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Períodos de interferência das plantas daninhas na cultura de cebola (Allium cepa) transplantada

Cited by 31 publications

References 1 publication

Períodos de interferência de plantas daninhas na cultura do quiabo

Períodos de interferência de plantas daninhas na cultura do quiabo

Growth and mineral nutrition of Solanum americanum

Effects of weed "Reestablishment" after hoeing on corn yields

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