Morphology and yield response to weed pressure by corn hybrids differing in canopy architecture

Begna, Sultan; Hamilton, R. I.; Dwyer, L. M.; Stewart, D. W.; Cloutier, D. C.; Assémat, Louis; Foroutan‐pour, Kayhan; Smith, Donald L.

doi:10.1016/s1161-0301(01)00092-2

Cited by 54 publications

(58 citation statements)

References 30 publications

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“…Variety differences in weed controlling capacity have been reported for many crops, including corn (Begna et al, 2001). Plant height, leaf development rate, leaf area index, and leaf distribution in the canopy have been cited as the most important weedsuppressing traits (Sinoquet & Caldwell, 1995); but it is possible that other traits, including those related to the root system, may also influence suppression.…”

Section: Introductionmentioning

confidence: 99%

Weed control in corn via intercropping with gliricidia sown by broadcasting

Oliveira¹,

Silva

Albuquerque

et al. 2011

Planta daninha

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There has been interest in reducing the use of herbicides for weed control in order to decrease environmental degradation problems. The objective of this study was to evaluate the effects of gliricidia planting density sown by broadcasting and intercopping on green ear and corn grain yield as well as on weed control. A randomized block design with split-plots and five replicates were adopted. Cultivars AG 1051, BM 2022, and BM 3061, assigned to plots, were submitted to the following treatments: no hoeing, two hoeings (at 20 and 40 days after sowing), and intercropped with gliricidia sown at densities of 10 and 20 seeds m-2. Thirty weed species occurred in the experiment area, with Cucumis anguria as the most frequent ones. Cultivar BM 2022 was the best for the total number of ears (TNE) and number (NMHE) and weight of marketable husked ears. Together with cultivar AG 1051, this cultivar had the highest total weight and marketable unhusked ear weight (MUEW). However, the cultivars did not differ with respect to grain yield (GY). The highest green ear and corn grain yield and weed control percentages were obtained with two hoeings; in MUEW, NMHE and GY, intercropping provided intermediate means in comparison with those obtained in hoed and non-hoed plots, indicating that gliricidia was partially beneficial to corn. Increased gliricidia seeding density heightened the benefits to corn (TNE and MUEW). The lack of hoeing produced the poorest green ear and grain yields.

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Section: Introductionmentioning

confidence: 99%

Weed control in corn via intercropping with gliricidia sown by broadcasting

Oliveira¹,

Silva

Albuquerque

et al. 2011

Planta daninha

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“…Begna et al (2001) relatam que a simples troca de um híbrido de milho por outro com características morfológicas mais competitivas pode resultar na redução dos níveis necessários de herbicidas para o controle local das plantas daninhas.…”

Section: Introductionunclassified

Características fisiológicas das culturas de soja e feijão e de três espécies de plantas daninhas

et al. 2004

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RESUMO -O objetivo do trabalho foi avaliar os características fisiológicas taxa de fotossíntese líquida (A), taxa de transpiração (E), condutância estomática (gs) e eficiência do uso da água (WUE) e os índices de crescimento biomassa seca total (Wt) e índice de área foliar (L) para as culturas de soja (Glycine max) e feijão (Phaseolus vulgaris) e para as das plantas daninhas Bidens pilosa, Desmodium tortuosum e dois biótipos de Euphorbia heterophylla (um suscetível e outro resistente aos herbicidas inibidores da ALS), em duas épocas de avaliação: 39 e 67 dias após a semeadura (DAS). O experimento foi conduzido a campo em um Argissolo Vermelho-Amarelo, fase terraço, utilizando-se o delineamento experimental de blocos ao acaso, com parcelas subdivididas, sendo o fator da parcela principal as espécies vegetais e o da subparcela as épocas de avaliação, com quatro repetições por tratamento. Foi observado maior Wt da soja em relação às plantas daninhas. As culturas de soja e feijão apresentaram maior L do que as plantas daninhas. Os biótipos de E. heterophylla apresentaram a maior A, bem como a maior gs. Com exceção de D. tortuosum, as plantas daninhas apresentaram maior WUE em relação às culturas nos estádios iniciais de desenvolvimento. Não foram observadas diferenças em relação a qualquer parâmetro fisiológico avaliado entre os biótipos de E. heterophylla. Palavras-chave: Phaseolus vulgaris, Glycine max, fotossíntese, transpiração. ABSTRACT -This work aimed to evaluate the physiological caracteristics net photosynthesis (A), transpiration rate (E), stomatal conductance (gs) and water use efficiency (WUE) and growth indexes of total dry matter (Wt) and leaf area index (L) for soybean (Glycine max), common bean (Phaseolus vulgaris) and weeds Bidens pilosa, Desmodium tortuosum and two biotypes of Euphorbia heterophylla (one susceptible and other resistant to ALS inhibitor herbicides) during two periods of evaluation, 39 and 67 days after sowing (DAS

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“…The ability to suppress the growth of weeds is relevant to reduce the weed seed bank in the soil. Unlike what was observed in other studies conducted with rice (BALBINOT JR. et al, 2003a), corn (BEGNA et al, 2001), soybean (BIANCHI et al, 2006) and wheat (LEMERLE et al, 2001), the percentage of soil coverage by common bean plants and the plant height did not estimate consistently the competitive ability of black common bean genotypes. Probably roots characteristics of common bean genotypes influence the competitiveness against weeds, as discussed by Cury et al (2013).…”

Section: Resultsmentioning

confidence: 96%

“…Researches conducted with rice (BALBINOT JR. et al, 2003a;BALBINOT JR. et al, 2003b), wheat (LEMERLE et al, 2001), maize (BEGNA et al, 2001.;FLECK, 2005) and soybean (FLECK, VERBEEK;ORCHARD, 2007) indicate that the growth rate is the key factor to increase crop competitiveness with weeds. The early establishment of plants confers advantage in the use of environmental resources.…”

Section: Introductionmentioning

confidence: 99%

Competitive ability of black common bean genotypes with weeds

et al. 2013

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The morpho-physiologic characteristics of common bean plants can affect their competitive ability with weeds. The objective of this work was to evaluate the competitive ability of black bean genotypes with weeds. An experiment was carried out in the 2010/ 11 cropping season in Papanduva, SC, southern Brazil, in order to verify the variability of some plant characteristics among genotypes of common bean. The randomized block design was used, with four replications. Seven cultivars underwent the treatments: BRS Campeiro, CHP 01-238, CHP 01-239, Diamante Negro, BRS Supremo, BRS Valente, IPR Uirapuru, FTS Soberano, IPR Graúna, IPR Tiziu e IAC Diplomata. At 6, 14, 18, 25 and 32 days after emergence (DAE) were evaluated plant height, ground cover by common bean plants, dry biomass of stems and leaves, and grain yield. In the 2011/12 cropping season the same cultivars were grown in the presence or absence of weeds, adopting similar methodology to the 2010/11. The losses of grain yield in black common bean genotypes due to weed interference ranged from 30.8% to 54.9%. There was a positive correlation between yield reduction promoted by the weed infestation and dry biomass produced by the weeds. In addition, there was a positive correlation between percentage of yield reduction due to the weed infestation and grain yield without weed interference. The characteristics evaluated did not estimate the competitive ability of black common bean genotypes with weeds. Index terms:Phaseolus vulgaris, weed interference, grain yield. RESUMOAs características morfofisiológicas de plantas de feijão podem afetar a habilidade competitiva com plantas daninhas. Neste trabalho, objetivou-se avaliar a competitividade de genótipos de feijão do grupo "Preto" com plantas daninhas. Inicialmente, foi conduzido um experimento na safra 2010/11 em Papanduva, SC, para verificar a variabilidade entre genótipos de feijão-preto quanto a algumas características da planta. Foi utilizado o delineamento experimental de blocos casualizados, com quatro repetições. Os tratamentos foram constituídos pelos seguintes genótipos: BRS Campeiro, CHP 01-238, CHP 01-239, Diamante Negro, BRS Supremo, BRS Valente, IPR Uirapuru, FTS Soberano, IPR Graúna, IPR Tiziu e IAC Diplomata. Aos 6, 14, 18, 25 e 32 dias após a emergência (DAE) foram determinadas altura das plantas, cobertura do solo pelas plantas de feijão, massa seca de hastes e folhas e, ao final do ciclo, a produtividade dos grãos. Na safra 2011/12, os mesmos genótipos foram avaliados na presença ou ausência de plantas daninhas, adotando metodologia similar à da safra 2010/11. As perdas de produtividade de grãos dos genótipos de feijão avaliados, em razão da interferência de plantas daninhas, variaram de 30,8 a 54,9%. Houve correlação positiva entre porcentagem de redução de produtividade em razão da infestação e a massa seca acumulada pelas plantas daninhas. Também houve correlação positiva entre porcentagem de redução de produtividade em função da interferência de plantas daninhas e a produtividade sem ...

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Morphology and yield response to weed pressure by corn hybrids differing in canopy architecture

Cited by 54 publications

References 30 publications

Weed control in corn via intercropping with gliricidia sown by broadcasting

Weed control in corn via intercropping with gliricidia sown by broadcasting

Características fisiológicas das culturas de soja e feijão e de três espécies de plantas daninhas

Competitive ability of black common bean genotypes with weeds

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