Manejo químico de plantas daninhas na cultura do milho em função de características morfofisiológicas e redução de espaçamento da cultura

Trezzi, Michelangelo Müzell; Vidal, Ribas Antônio; Kruse, Nelson Diehl; Prates, M.V.B.; Gustman, M.S; Nunes, Anderson Luís; Argenta, Gilber

doi:10.1590/s0100-83582008000400016

Cited by 7 publications

(11 citation statements)

References 19 publications

(14 reference statements)

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“…The highest yield was obtained with the hybrid XB 7253 with 70,000 plants ha -1 in the spacings of 0.45 and 0.90 m, while for the hybrids XB 6010, XB 6012 and XB 9003 there was no significant response to spatial arrangements and 50,000 plants ha -1 could be recommended for both spacings. In another study, Trezzi et al (2008) found higher yield with the hybrid Penta in the spacing 0.90 m, while the hybrid Sprint had similar yield in both spacings 0.90 m and 0.45 m.…”

Section: Resultsmentioning

confidence: 86%

“…However, the increase in N rates requires the split of nitrogen fertilization to enhance the increase in yield (Von Pinho et al, 2008). The use of higher nitrogen rates, adequate plant density and sowing speed may increase the corn yield without changing the spacing between lines (Alvarez et al, 2006;Trezzi et al, 2008;Alvarez et al, 2009;Kappes et al, 2011;Sangoi et al, 2011). The reduction in spacing requires suitable platforms for harvesting, therefore the farmer needs to modify or acquire new platforms to harvest in reduced spacings , which results in increased costs.…”

Section: Resultsmentioning

confidence: 99%

“…Research shows that improving plant arrangement, in equidistant spacings, has contributed to decreasing competition between plants in the row and reducing soil water evaporation due to increased shading (Argenta, 2001). It also facilitates weed management (Trezzi et al, 2008) and provides higher yields (Trezzi et al, 2008;Lana et al, 2009;Modolo et al, 2010). This fact is associated with the use of water, soil nutrients and interception of solar radiation, which are decisive in yield formation (Lauer, 1994;Argenta, 2001;Deparis et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Spacing, population density and nitrogen fertilization in corn grown in an Oxisoil

et al. 2014

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RESUMOEspaçamento, densidade populacional e adubação nitrogenada na cultura do milho O objetivo deste trabalho foi avaliar os componentes de produção, teor de nitrogênio (N) no tecido foliar e produtividade de grãos na cultura do milho em função de diferentes espaçamentos entre linhas, densidade populacional e doses de adubação nitrogenada em cobertura. O experimento foi conduzido no município de Toledo-PR, no ano agrícola de 2005/2006, em área de Latossolo Vermelho Eutroférrico sob sistema de semeadura direta, com o híbrido simples AG 8021. O delineamento experimental utilizado foi em blocos casualizados, com quatro repetições e tratamentos dispostos em parcelas subsubdivididas. Nas parcelas foram alocados os espaçamentos entre linhas (0,45 e 0,90 m), nas subparcelas foram alocadas as populações de plantas de milho (60 mil e 80 mil plantas ha -1 ) e nas subsubparcelas foram alocadas as doses de nitrogênio em cobertura (80, 100, 120 e 140 kg ha -1 de N), utilizando-se como fonte de nitrogênio a ureia. A elevação da população de plantas de 60 mil para 80 mil plantas ha -1 , assim como a aplicação de doses crescentes da adubação nitrogenada em cobertura proporcionaram incremento nos componentes de produção. A aplicação de N em cobertura proporciona incremento no teor de N foliar e na produtividade de grãos para o espaçamento 0,45 m e 0,90 m. O espaçamento de 0,45 m alcançou produtividade superior ao espaçamento 0,90 m. Com 60 mil plantas a produtividade foi maior do que com 80 mil plantas no espaçamento de 0,90 m, enquanto que com 0,45 m não houve diferença quanto à densidade populacional.Palavras-chave: arranjo de plantas, Zea mays L., ureia, nitrogênio em cobertura. Spacing, population density and nitrogen fertilization in corn grown in an OxisoilThe objective of this study was to evaluate yield components, leaf nitrogen content and grain yield in corn as affected by row spacing, plant density and nitrogen topdressing. The experiment was conducted with the singlecross hybrid AG 8021, in the municipality of Toledo-PR, in an Oxisoil under no-tillage system, in the crop year 2005/ 2006. The experiment was arranged in a randomized block design and treatments in split-split-plots, with four replications. The two row spacings (0.45 and 0.90 m) were allocated in the main plots, the two plant densities (60,000 and 80,000 plants ha -1 ) were allocated in the subplots and the three nitrogen rates (80, 100, 120 and 140 kg ha -1 N) were allocated in the sub-subplots. Topdress nitrogen was applied using urea as N source. The rise of the plant population from 60,000 to 80,000 plants ha -1 and the application of topdress nitrogen resulted in increased production components. The application of topdress fertilization provided increase in leaf N content and grain yield for the spacings 0.45 m and 0.90 m. Yield was higher in the spacing 0.45 m than 0.90 m. Yield was higher with 60,000 plants than with 80,000 plants at 0.90 m, while at 0.45 m there was no difference in relation to the plant density.

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Section: Resultsmentioning

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spacing, population density and nitrogen fertilization in corn grown in an Oxisoil

et al. 2014

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“…Tabela 2 -Síntese da análise de variância e do teste de médias para as variáveis número de fileiras por espiga, número de grãos por fileira, número de espigas por planta, peso de mil grãos (g) e produtividade (kg ha -1 ) de três híbridos de milho submetidos a três espaçamentos NUNES, 1995;TREZZI et al, 2008). Esses resultados existentes na literatura podem ser atribuídos a diversos fatores, entre os quais se pode citar o tipo de híbrido, população de plantas, as características climáticas da região e o nível de fertilidade do solo, dentre outros (SANGOI et al, 2002).…”

Section: Desempenho De Híbridos De Milho Na Região Sudoeste Do Paranáunclassified

Desempenho de híbridos de milho na Região Sudoeste do Paraná sob diferentes espaçamentos entre linhas

et al. 2010

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Palavras-chave -Milho hibrido. Plantio direto. Componentes de rendimento.Abstract -Corn plant arrangement is one of the most important management tool to improve solar radiation interception and it can be done through changes in plant density, row spacing, distribution of plants in the row and plant variability aiming to optimize its use and maximize the yield. Due to it, the objective of this work was to study the effects of different corn hybrids and row spacing over the corn development cultivated in a no-tillage system in the Southwest of Paraná. The experiment was carried out at the experimental area of the UTFPR Agronomy Course located in Pato Branco -Pr, following a complete randomized block design factorial (3 x 3), with four replications. The treatments consisted of combinations among three hybrids (DKB 240, Pioneer 30R50 and SG 6010) and three row spacing (0.45; 0.70 and 0.90 m). After seeding, were evaluated: plant height, stem diameter, grain yield and its components. According to the results, there were no interaction among hybrids and row spacing, the row spacing reduction promoted greater number of spikes per plant and increased corn grain yield.

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“…Several studies have demonstrated the interference of plants in corn crops (Borghi et al, 2008;Freitas et al, 2008;Trezzi et al, 2008). In the Northeastern region of Brazil, weed control is performed mainly with a hoe, but in large agricultural companies, herbicides are frequently used.…”

Section: Introductionmentioning

confidence: 99%

Planting density of gliricidia when intercropped with corn for weed control

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Silva

Oliveira³

et al. 2009

Planta daninha

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Reduced use of herbicides that cause environmental pollution problems is of great interest in modern agriculture. Soil mulching with gliricidia (Gliricidia sepium) branches does not have an allelopathic effect on corn, but decreases weed populations. The objective of this study was to evaluate the effects of gliricidia planting density, when grown as an intercrop, on weed control and corn yield parameters. A randomized block design with split-plots and ten replicates was adopted. Corn cultivars AG 1051 and BM 3061 were grown without hoeing, with two hoes (at 24 and 44 days after planting), and intercropped with gliricidia (planted simultaneously with corn, between crop rows, using two seedlings/pit, spaced at 30, 40, or 50 cm). Twenty-one weed species were found in the experimental area. Increased gliricidia planting density reduced weed biomass, but no difference was found between weed biomass in the intercrop and weed biomass in non-hoed corn. Gliricidia intercropped with corn, planted at a row spacing of 30 cm, did not significantly differ from hoed corn in most characteristics considered to evaluate green corn yield, although mean values were smaller. As to the number and weight of marketable green ears, reductions of 5% and 13%, respectively, were observed. Intercropping caused a 17% reduction in grain yield, reducing the losses (36%) observed in non-hoed corn by more than 50%. The highest green ear yield and grain yield values were obtained with two hoeings, while the lowest values were observed for non-hoed corn. The cultivars did not differ regarding green ear yield and grain yield.

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Manejo químico de plantas daninhas na cultura do milho em função de características morfofisiológicas e redução de espaçamento da cultura

Cited by 7 publications

References 19 publications

Spacing, population density and nitrogen fertilization in corn grown in an Oxisoil

Spacing, population density and nitrogen fertilization in corn grown in an Oxisoil

Desempenho de híbridos de milho na Região Sudoeste do Paraná sob diferentes espaçamentos entre linhas

Planting density of gliricidia when intercropped with corn for weed control

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