Desempenho de híbridos de milho em diferentes arranjos espaciais de plantas

Kappes, Claudinei; Andrade, João Antônio da Costa; Arf, Orivaldo; Oliveira, Alessandra Conceição de; Arf, Marcelo Valentini; Ferreira, João Paulo

doi:10.1590/s0006-87052011000200012

Cited by 56 publications

(66 citation statements)

References 16 publications

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“…ANOVA error probability and coefficient of variation (CV) for the number of ears per plant (NEP), number of grains per ear (NGE), mass of 100 grains (MCG), aboveground dry matter productivity (MS), harvest index (HI), and grain productivity (Pgrains), for maize crops grown at different levels of irrigation and plant density. Kappes et al (2011), using the hybrids XB 6010, XB 6012, XB 7253, XB 9003, and AG 9010; densities between 5 and 9 plants per m -2 resulted in a gradual average change from 1.0 to 0.92 ears per plant -1 , respectively. According to Sangoi et al (2002), increasing plant density enhances the apical dominance of the tassel on the ear, suppressing female fertility.…”

Section: Resultsmentioning

confidence: 99%

“…The yield of maize grain is a complex variable that depends on the interaction between genetic, environmental, and management factors (KAPPES et al, 2011). There are several causes of a low crop yield, in particular insufficient availability of water and nutrients in the soil, incorrect soil management, and inappropriate sowing density (SILVA et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

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Influence of Irrigation Levels and Plant Density on "Second-Season" Maize

et al. 2016

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-This study assessed the effect of different irrigation levels and plant densities on maize crops cultivated during the second season in the Western Border region of the State of Rio Grande do Sul. This work was conducted at the Federal Institute of Farroupilha -Alegrete Campus/RS -between January and June 2014. Treatments were arranged in a completely randomized 5 × 4 factorial design, with 3 replicates each. Irrigation of fixed amounts of water that were based on the evapotranspiration of the culture (Et c ): 0, 50, 75, 100, and 125% of Et c were applied at 5-day intervals. Four densities of plants were defined (4, 7, 10, and 13 plants m -2 ). We assessed number of maize ears per plant, number of grains per ear, aboveground dry matter, mass of 100 grains, harvest index, and grain productivity. The number of grains per ear, mass of 100 grains, and grain yield were influenced by irrigation levels. Plant density and water depth influenced the number of grains per ear, the mass of 100 grains, and grain productivity. The highest yield of winter maize grain was achieved with a combination of 13 plants per m -2 and an irrigation level of 100% of Et c . Specific densities of plants maximized the yield of maize at each irrigation level, demonstrating that choice of plant density is a critical variable in the second crop of maize, and significantly influences the components of production.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Irrigation Levels and Plant Density on "Second-Season" Maize

et al. 2016

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“…Conversely, in irregularly spaced crop systems, certain individuals stand out over the others in the same population and, consequently, the frequency of plants dominated by the higher intensity of intraspecific competition tends to increase, hampering the agronomic performance of the crop (Sangoi et al, 2012). Stalk diameter is important in the mechanical harvest, avoiding plant breaking and lodging due to thinner stalks (Kappes et al, 2011).…”

Section: Resultsmentioning

confidence: 99%

Production components of corn as function of seed distribution along the planting row

Silva

Cunha

Almeida

et al. 2015

Rev. bras. eng. agríc. ambient.

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A B S T R A C THigh corn yields in high-tech systems are related to proper crop implementation. This study aimed to evaluate the effects of variability in the distribution of seeds along the planting row on corn production components. The study was conducted under Cerrado conditions in the municipality of Urutaí, GO, Brazil. The experimental design was randomized blocks in a 5 x 2 factorial scheme, with four replicates. The effects of five coefficients of variation (0, 20, 40, 60 and 80%) of non-uniformity in the spatial distribution of seeds along the planting row of two corn hybrids (P30F53HX and P3646HX) were evaluated. No interactions were observed for the analysed corn variables. However, as the non-uniformity in seed distribution along the planting row increased, stalk diameter, hundred-grain weight, number of rows per ear, number of kernels per row and ear length decreased. Additionally, linear reductions were observed in corn grain yield with the increase in the coefficient of variation of the spatial distribution of seeds along the planting row. Between the hybrids, the 30F53HX showed higher hundred-grain weight.

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“…The spatial arrangement of corn plants varies depending on the spacing between rows and between plants in the row (Von Pinho, 2008;Kappes et al, 2011). 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).…”

Section: Introductionmentioning

confidence: 99%

“…Nitrogen fertilization should consider the expected grain yield and soil organic matter content (Argenta, 2001), since nitrogen interferes positively on yield (Cancellier et al, 2011;Farinelli & Lemos, 2012) when other factors are not limiting. In southern Brazil (Ceretta, 2000) and in and in the whole country (Coelho, 2007), corn yield is limited by insufficient N fertilization to the extent that the increase in yield with increasing nitrogen rates is represented by the increase in the number and weight of grains and spike length (Kappes et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

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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Desempenho de híbridos de milho em diferentes arranjos espaciais de plantas

Cited by 56 publications

References 16 publications

Influence of Irrigation Levels and Plant Density on "Second-Season" Maize

Influence of Irrigation Levels and Plant Density on "Second-Season" Maize

Production components of corn as function of seed distribution along the planting row

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

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