Produção e qualidade de sementes do capim-mombaça em função da adubação nitrogenada

Canto, Marcos Weber do; Neto, Armindo Barth; Júnior, Edson José Pancera; Gasparino, Eliane; Boleta, Vinícius Scandolara

doi:10.1590/s0006-87052012005000032

Cited by 14 publications

(17 citation statements)

References 11 publications

(3 reference statements)

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“…The number of reproductive tillers is one of the most important and crucial components of forage grass seed productivity and, therefore, the management should be focused on favoring this component. The strong association of this component with seed yield was proven in Urochloa (Quadros et al, 2010), Paspalum urvillei (Lopes and Franke, 2011a), Paspalum notatum (Lopes and Franke, 2011b), and Panicum maximum (Canto et al, 2012) and even serves as an indicator for breeding programs that seek to produce seeds of forage species (Biligetu et al, 2012). According to Souza (2001), the increased production of reproductive tiller requires a greater number of inflorescences and, therefore, higher final seed yield.…”

Section: Resultsmentioning

confidence: 99%

Management of consecutive cuts in the production and quality of wintergreen paspalum seeds

et al. 2016

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-The objective of this study was to evaluate the practice of consecutive cuts in the production and quality of Paspalum guenoarum seeds of the "Azulão" ecotype. The experimental design used was in completely randomized blocks with four replications. The treatment included three cuts in succession: zero cut, one cut, two cuts, and three cuts. The variables were: number of total tillers/plant; number of vegetative tillers/plant; number of reproductive tillers/plant; percentage of reproductive tillers; number of racemes/inflorescence; weight of thousand seeds; number of seeds/inflorescence; seed production; forage dry matter; water content of seeds; germination; first germination count; and germination speed index. The largest seed production was obtained with zero cut (850.3, first year and 719.4 kg/ha -1 , second year) and one cut (794.4, first year and 627.3 kg/ha -1 , second year) with no statistical difference between them. The largest germination percentage was seen with the application of zero (71.0%, first year and 79.3%, second year) and one cut (69.3%, first year and 75.0%, second year). There was a decrease in the production and quality of the seeds of the second cut, especially during the first year of evaluation. The total tillers, the percentage of tillers that went through the reproductive stage, and the number of reproductive tillers are the variables that are most highly correlated with seed production.

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Section: Resultsmentioning

confidence: 99%

Management of consecutive cuts in the production and quality of wintergreen paspalum seeds

et al. 2016

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“…Em Panicum maximum, com o B, inexistem estudos sobre a qualidade de sementes. A baixa germinação de sementes pode ser devido à imaturidade das sementes e a dormência residual que reduzem a germinação de sementes colhidas de panículas em Panicum maximum (MUIR;JANK, 2004;DIAS;ALVES, 2008;CANTO et al, 2012).…”

Section: Fonte: Elaboração Dos Autoresunclassified

“…Lordkaew et al (2013) Como não houve aumento no número de perfilhos com panícula, os incrementos nas produtividades de sementes puras e de puras viáveis foi obtido com o aumento no número de sementes puras panícula -1 e na massa de mil sementes puras, mostrando que houve efeitos compensatórios. Os coeficientes de correlações simples descrevendo as relações entre os números de sementes aparentes e puras área -1 com a produtividade de sementes aparentes, produtividade de sementes puras e com o índice de colheita, foram de magnitude próxima aos reportados por Barth Neto et al (2010) e por Canto et al (2012). As correlações significativas entre a porcentagem de sementes puras e a massa de mil sementes puras com as produtividade de sementes aparentes, puras e puras viáveis, obtidas neste trabalho, podem estar também associadas aos efeitos do B citados previamente que resultaram em melhoria no vingamento de sementes do capimmombaça.…”

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Resposta da cultura de sementes de capim-mombaça a épocas e doses de adubação de boro

Almeida¹,

Canto²,

Neto³

et al. 2015

Sem. Ci. Agr.

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ResumoDeficiência ou toxidez de boro (B) tem sido frequentemente mencionada em culturas de interesse agronômico. Neste experimento objetivou-se avaliar os efeitos de duas épocas (03 de março e na antese) e de quatro doses de aplicação foliar de B (Bórax) (equivalente a zero; 2,0; 4,0 e 6,0 kg ha -1 ) sobre os componentes da produtividade e da qualidade de sementes, na produtividade de sementes e sobre relações componentes-produtividade em capim-mombaça (Panicum maximum Jacq. cv. Mombaça). O experimento foi conduzido a campo. O delineamento experimental foi em blocos ao acaso, em esquema fatorial (2x4), com quatro repetições. Épocas e doses de B não tiveram efeito sobre a massa individual de perfilhos vegetativo e de perfilho com panícula e sobre os números de perfilhos vegetativos, com panícula e total. Houve interação significativa para a aplicação de B em 03 de março para os números de sementes aparentes e puras, panícula -1 e área -1 , para a massa de mil sementes puras, produtividade de sementes aparentes, produtividade de sementes puras, índice de colheita e para a produtividade de sementes puras viáveis. As épocas e as doses de B não afetaram a pureza física e a germinação de sementes. Correlação significativa e alta foi obtida entre os números de sementes aparentes e puras por área e o índice de colheita com as produtividades de sementes aparentes e puras. Dose foliar de B de 4,0 kg ha -1 pode ser indicada para ser aplicada em 03 de março em culturas de sementes de capim-mombaça. Palavras-chave: Adubação foliar de micronutriente, qualidade de sementes de gramínea tropical, Panicum maximum, produtividade de sementes Abstract Boron (B) deficiency has been frequently mentioned in crops of agronomic interest. This experiment aimed to evaluate the effects of two times (March 3 2008 and at anthesis) and four doses of foliar application of B (equivalent to 0, 2, 4 and 6 kg ha -1 ) in Mombaça grass (Panicum maximum Jacq. cv. Mombaça) on components of seed yield and quality, seed yield, and relationships among yieldcomponents. The experimental design was a randomized block design with a factorial design (2x4), with four replications. The experiment was conducted in the field. The times and doses of B application had no effect on the mass of tillers vegetative and tillers with panicle, and numbers of vegetative tillers, tillers with panicle and total tillers. The interaction was significant in March 3, for the number of seeds apparent and pure, panicle -1 and area -1 , apparent seed yield, pure seed yield, harvest index, germinable

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“…Nitrogen (N) has a very important function in the production of tropical perennial forage grasses because it increases the yield components that are most strongly correlated with seed yield, such as the number of reproductive tillers, inflorescence length, number of seeds per inflorescence, and seed filling (Loeppky and Coulman, 2001;Canto et al, 2012). Moreover, N is one of the nutrients that accumulates in high amounts in the herbage of tropical perennial forage grasses (Vellinga et al, 2009) due to the intense vegetative growth of the plants prior to the flowering stage (Pires, 2006).…”

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Nitrogen Management, Nitrogen Use Efficiency, and Seed Yield and Quality of Creeping Signalgrass

et al. 2017

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Nitrogen (N) fertilization management can affect the seed yield and quality of tropical forage grasses. Studies have shown the effect of N rates on tropical grass seed production, but no study has evaluated the effect of application timing of N on the N use efficiency (NUE) and seed yield and quality of creeping signalgrass [Urochloa humidicola (Rendle) Morrone & Zuloaga, syn. Brachiaria humidicola (Rendle) Schweick.]. Field experiments were conducted over two growing seasons in Santo Anastácio, São Paulo, Brazil, to evaluate the influence of N fertilization timing on plant nutrition, herbage mass, N uptake, NUE, and seed yield and quality of creeping signalgrass ‘Llanero’. The treatments included a control (no N application) and four treatments with N applied at different times (150 kg N ha−1 during the vegetative phase, 150 kg N ha−1 at panicle initiation [prebooting], 100 kg N ha−1 during the vegetative phase plus 50 kg N ha−1 at panicle initiation, and 50 kg N ha−1 during the vegetative phase plus 100 kg N ha−1 at panicle initiation). Topdressed N fertilization increased the concentration of N in the flag leaf by 35.9% (from 12.2 to 16.6 g kg−1) and increased the herbage N uptake by 99.7% (from 72 and 144 kg ha−1). Herbage mass was not affected by topdressed N fertilization. The greatest seed yield (64.2% or 136 kg ha−1 greater than the control, and an average of 22.5% or 64 kg ha−1 greater than the other N treatments) was observed in response to 100 kg N ha−1 applied during the vegetative phase plus 50 kg N ha−1 applied at panicle initiation, which resulted in improved NUE. Seed viability was greater in the treatments where all or most of the N was applied at panicle initiation. In addition, the seed germination percentage was positively affected by N fertilization, regardless of the N application timing.

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Produção e qualidade de sementes do capim-mombaça em função da adubação nitrogenada

Cited by 14 publications

References 11 publications

Management of consecutive cuts in the production and quality of wintergreen paspalum seeds

Management of consecutive cuts in the production and quality of wintergreen paspalum seeds

Resposta da cultura de sementes de capim-mombaça a épocas e doses de adubação de boro

Nitrogen Management, Nitrogen Use Efficiency, and Seed Yield and Quality of Creeping Signalgrass

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