Períodos de interferência de Brachiaria plantaginea na cultura do milho na região Sul do Rio Grande do Sul

Galon, Leandro; Pinto, J.J.O.; Rocha, Adriano Alvim; Concenço, Germani; Silva, A.F.; Aspiazú, Ignácio; Ferreira, E.A.; França, André Cabral; Ferreira, F.A.; Agostinetto, Dirceu; Pinho, Camila Ferreira de

doi:10.1590/s0100-83582008000400009

Cited by 17 publications

(24 citation statements)

References 16 publications

(14 reference statements)

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“…Similar results have previously been reported (ZAGONEL et al, 2000;GALON et al, 2008). The 100-grain weight increased with increase in the period of coexistence of the crop with the weed plants; this might be a plant strategy to guarantee its reproduction under stress conditions.…”

Section: Resultssupporting

confidence: 89%

Periods of weed interference in maize crops cultivated in the first and second cycles

Campos

Barroso

Silva

et al. 2016

SCA

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The interference of weeds in maize production may be reflected in grain yield losses that vary as a function of the density, stage and degree of aggressiveness of the species present. In the agricultural ecosystem, crops and weeds demand light, water, nutrients and space, which are frequently not available in sufficient quantities, leading to competition. The aim of this work was to determine the period of interference of weed plants, in particular of naked crabgrass (Digitaria nuda) on maize crop in the first and second harvest. The treatments were defined as increasing periods of coexistence and increasing control of weed community (7, 14, 21, 28, 35, 42, 49, and 56 days), two more controls, a control including one with weed control until the end of the culture cycle and another with coexistence until the harvest. For each period, were evaluated the stand of maize plants, length of ear, number of grains per row, number of rows per ear, cob, 100-grain weight, and grain productivity. The data obtained were subjected to analysis of variance using the F test, with average treatments compared using Tukey's test at 5% probability. Crop productivity was evaluated by means of regressions, the critical periods of interference were estimated. The critical timing of weed removal was 25 days for both harvests. The critical weed free period was 54 and 27 days for the first and second harvest respectively. For the conditions of the first and second harvest, the critical period of weed control was of 29 and 2 days respectively. Key words: Digitaria nuda. Naked crabgrass. Competition. Phytosociology. Weed interference. Zea mays. ResumoA interferência de plantas daninhas no milho pode refletir em perdas na produtividade de grãos que variam em função da densidade, estágio e grau de agressividade das espécies presentes. No ecossistema agrícola, a cultura e planta daninha possuem demandas por luz, água, nutrientes e espaço, que na maioria das vezes, não estão disponíveis em quantidades suficientes, estabelecendo-se a competição. O objetivo desse trabalho foi determinar o período de interferência de plantas de plantas daninhas em especial do capim-colchão (Digitaria nuda) na cultura do milho na primeira e segunda safra. Os tratamentos foram divididos em períodos crescentes de convivência e de controle da comunidade infestante (7; 14; 21; 28; 35; 42; 49 e 56 dias), mais duas testemunhas, uma com controle até o fim do ciclo da cultura e outra com convivência até a colheita. Para cada período foram avaliadas o estande de plantas de milho, comprimento das espigas, número de grãos por fileiras, número de fileiras por espiga, massa de 100 grãos e produtividade de grãos. Os dados obtidos foram submetidos à análise de variância

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Section: Resultssupporting

confidence: 89%

Periods of weed interference in maize crops cultivated in the first and second cycles

Campos

Barroso

Silva

et al. 2016

SCA

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“…A interferência negativa exercida pela braquiária, na fase vegetativa do milho, pode, entre outras alterações, diminuir a altura de inserção da espiga (Fancelli & Dourado Neto, 2000). Resultados semelhantes foram observados por Galon et al (2008), na ausência de controle da Brachiaria plantaginea no cultivo de milho.…”

Section: Resultsunclassified

Consórcio de milho com braquiária e guandu-anão em sistema de dessecação parcial

Oliveira¹,

Kluthcouski²,

Favarin

et al. 2011

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi avaliar a viabilidade do consórcio de milho (Zea mays) cv. BRS 1035 com braquiária (Urochloa brizantha) e guandu-anão (Cajanus cajan), no sistema de dessecação parcial. Os experimentos foram realizados na safra de verão de 2008/2009, em Santo Antônio de Goiás, GO e Ipameri, GO, em blocos completos ao acaso, com cinco repetições. Os tratamentos constituíram-se de cultivos de milho, em consórcio com braquiária e guandu-anão, com a aplicação de nitrogênio mineral em cobertura, à emergência da cultura ou aos 20 dias após esse evento, com ou sem aplicação de subdose de herbicida à braquiária não dessecada. A viabilidade do sistema de dessecação parcial é dependente do manejo da adubação nitrogenada do milho ou do controle do crescimento da braquiária nas faixas não dessecadas.Termos para indexação: Brachiaria, Zea mays, culturas intercalares, curva de crescimento, índice de área foliar, produtividade. Maize intercropped with palisadegrass and pigeon pea in partial desiccation systemAbstract -The objective of this work was to assess the viability of maize (Zea mays) cultivar BRS 1035 intercropped with palisadegrass (Urochloa brizantha) and pigeon pea (Cajanus cajan) in the partial desiccation system. The experiments were performed in the summer season of 2008/2009, in Santo Antônio de Goiás, GO and Ipameri, GO, Brazil, in a complete randomized block design, with five replicates. The treatments consisted of maize intercropped with palisadegrass and pigeon pea, with mineral nitrogen application on maize, on the day of its emergence, or 20 days after this event, with or without the application of a herbicide subdose on palisadegrass not desiccated. The viability of the partial desiccation system is dependent on the nitrogen fertilizer management of corn or on the growth control of nondesiccated palisadegrass rows.

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“…It is estimated that yield losses in maize as a function of competition with weeds are in the order of 13% (Carvalho et al, 2007). In many situations, where no control measures are adopted, this reduction can reach 85% (Carvalho et al, 2007) or more than 90% (Merotto Jr. et al, 1997;Galon et al, 2008). the productivity of these crops (Agostinetto et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…The period of cohabitation of the weed crop can be divided into: a) pre-interference period (PIP), period from the sowing, the crop can live with the weeds without reducing the productivity; b) total period of weed control (TPWC), that from the emergence of the crop, in which weeds must be controlled so that the crop exerts its maximum productive potential; c) critical period of weed control (CPWC), corresponds to the difference between the PIP and the TPWC, when the crop should be effectively weed-free. The knowledge of these periods helps to carry out the necessary managements for the control of weeds in maize (Pitelli & Durigan, 1984;Galon et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Interference Periods of Weeds Infesting Maize Crop

Galon¹,

Bagnara²,

Gabiatti³

et al. 2018

JAS

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When competing with crops, weeds interfere with their growth and consequently reduce grain yield. The purpose of this research was to determine the periods of interference; PIP (pre-interference period), TPWC (total period of weed control), and CPWC (critical period of weed control) of the weeds Alexandergrass (Urochloa plantaginea) and southern crabgrass (Digitaria ciliares) in maize. The experiment was conducted in a randomized complete block design with four replications, in a no-tillage system. The treatments consisted in maintaining maize in the presence and absence of Alexandergrass and southern crabgrass for increasing periods of 0, 7, 14, 21, 28, 35 and 42 days after emergence (DAE). Southern crabgrass and Alexandergrass weeds originated from the soil seed bank with an average density of 215 and 87 plants m-2, respectively. At the end of each period, PIP or TPWC, the weed and crop dry biomass was determined. At 42 DAE, the height and stem diameter of maize plants were evaluated. At harvest 10 maize plants per experimental unit were evaluated for length of ears, number of rows per ear, and number of grains per row. Yield was measured by taking three central rows from each experimental unit. The results indicate that the PIP was 17 DAE, the TPWC was 32 DAE, and the CPWC was 17 to 32 DAE.

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Períodos de interferência de Brachiaria plantaginea na cultura do milho na região Sul do Rio Grande do Sul

Cited by 17 publications

References 16 publications

Periods of weed interference in maize crops cultivated in the first and second cycles

Periods of weed interference in maize crops cultivated in the first and second cycles

Consórcio de milho com braquiária e guandu-anão em sistema de dessecação parcial

Interference Periods of Weeds Infesting Maize Crop

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