Classes de perfilhos na composição do índice de área foliar em pastos de capim-elefante

Carvalho, Carlos Augusto Brandão de; Rossiello, Roberto Oscar Pereyra; Paciullo, Domingos Sávio Campos; Sbrissia, André Fischer; Deresz, F.

doi:10.1590/s0100-204x2007000400014

Cited by 11 publications

(4 citation statements)

References 12 publications

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“…Según (Gomide & Paciullo, 2012), la producción de yemas es controlada por el patrón de aparición de hojas y persistencia de yemas, siendo afectada por su manejo e intervalo de pastoreo. Carvalho et al (2007), mencionan que el crecimiento de yemas de gramíneas forrajeras es una de las características más importantes para el aumento de la productividad de las plantas, pero puede ser influenciada por el sistema de manejo en pastoreo.…”

Section: Resultados Y Discusiónunclassified

Producción y características morfologicas de genotipos de pasto elefante enano (Pennisetum purpureum, Schum) sobre pastoreo

Paucar

Vásquez²,

Silva³

et al. 2018

An. cient. U.N.A.

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ResumenEl objetivo de este trabajo fue evaluar la producción, y las características morfológicas de tres genotipos de pasto elefante enano Pennisetum purpureum, Schum: (CNPGL 92198-7, CNPGL 94-34-3 y cv. Mott) sobre el pastoreo. El experimento fue conducido en el Sector de Forragicultura y Nutrición de Rumiantes (LZNA/CCTA) de la Universidad Estadual del Norte Fluminense Darcy Ribeiro, Campos de los Goytacazes, RJ, Brasil. El análisis estadístico fué bloques completos al azar, con parcelas subdivididas, con tres repeticiones. Las parcelas consistieron de tres genotipos de pasto elefante enano, mientras que las subparcelas fueron representadas por cuatro frecuencias de pastoreo: (30 y 45 días de descanso en época de lluvias y seca respectivamente), cuando el dosel forrajero alcanzaba 90, 95 y 100 % de interceptación de luz. Se verificó efecto del factor época sobre la producción, altura, cobertura y tasa de persistencia, con medias más altas en época de lluvias (P <0,01), en comparación con la época seca. El efecto de época del año sobre las variables analizadas confirma el comportamiento estacional del pasto elefante enano. Palabras clave: cv. Mott; interceptación luminosa; pastoreo rotacional; persistencia. AbstracThe objective of this work was to evaluate the production and morphological characteristics of dwarf elephant grass Pennisetum purpureum, Schum: (CNPGL 92198-7, CNPGL 94-343, cv. Mott) subjected to a grazing system. The experiment was conducted in the Sector of Forragiculture and Nutrition of Ruminants (LZNA / CCTA) of the State University of North Fluminense Darcy Ribeiro, Campos dos Goytacazes, Rio de Janeiro. The statistical analysis was randomized blocks with subdivided plots, with three repetitions. The parcels were composed by the three genotypes of dwarfish elephant grass, while the sub parcels were represented by four grazing frequencies: 30 and 45 days of resting period, respectively, for the raining and dry seasons, and when the forage canopy reached 90, 95 and 100 % of luminous interception. The effect of the season of the year was measured on height of the sward, soil covering, and the persistence rate of the tillers, with higher averages for the rainy season (P < 0.01). The genotypes with larger height of the forage canopy in the pre grazing were the cv. Mott and the genotype CNPGL 92198-7, while the genotype CNPGL 9434-3 presented the largest tillering rate. The effect of the season of the year on the analyzed variables confirms the behavior sharply seasonal of the dwarfish elephant grass.

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Section: Resultados Y Discusiónunclassified

Producción y características morfologicas de genotipos de pasto elefante enano (Pennisetum purpureum, Schum) sobre pastoreo

Paucar

Vásquez²,

Silva³

et al. 2018

An. cient. U.N.A.

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“…It should be stressed that higher dry matter production is not always equivalent to better quality, as it can result from greater accumulation of stems and dead material. According to literature reports, when the canopy reaches 95% of incident PAR interception, there is higher maximization of forage production, because the balance between growth rate (balance between photosynthesis and respiration) and senescence are maximized (Carvalho et al, 2007).…”

Section: Resultsmentioning

confidence: 99%

“…Table 3 -Averages of intercepted photosynthetically active radiation (%) and total dry matter production (TDMP), t/ha.year, for each cutting season of fodder plants under cutting and irrigation frequency of grazing plays an important role in the determination of the pitch. Thus, Carvalho et al (2007) claimed that PAR is affected by the grazing cycle through the interaction between the height of the residue and the grazing cycle.…”

Section: Resultsmentioning

confidence: 99%

Chemical composition and photosynthetically active radiation of forage grasses under irrigation

Silva¹,

Silva²,

Barreto³

et al. 2012

R. Bras. Zootec.

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“…It should be emphasized, however, that fixed values of leaf area index (LAI) should not be used as the sole form of management for determining the ideal interval, since this is likely to vary between species or even between different genotypes of the same species, and may also suffer from the influence of environmental factors, crop management, and the grazing method used (CARVALHO et al, 2007). In this sense, the objective of this work was to evaluate the light interception (%IL), and chemical and productive characteristics of elephant grass subjected to different frequencies of cutting.…”

Section: Introductionmentioning

confidence: 99%

Light interception, chemical, and productive characteristics of elephant grass subjected to different cutting intervals

Sanchês

Rodrigues

Araújo

et al. 2019

SCA

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This study aimed to evaluate the interception of light (%IL), leaf area index (LAI), and the chemical and productive characteristics of elephant grass (Pennisetum purpureum Schum) under different defoliation frequencies (30, 45, 60, 75, and 90 days after cutting). The experimental design was completely randomized with five replications and five treatments (cutting frequencies). The chemical composition was analyzed in a factorial arrangement 2 ×5 (two fractions: leaf and stem, and five defoliation frequencies). The pattern of variation in IL and LAI in function of the frequency of cutting was ascending order. The maximum values of %IL and LAI occurred at 75 and 90 days after cutting with 98.46%; 98.72% (%IL) and 7.08; 8.10 (LAI), respectively. There was no effect of cutting frequency on the total yield of forage, leaf production, generation of stem and dead material, tillers alive, dead tillers and height. Only the leaf/stem ratio was not influenced (P > 0.05) among the factors studied. The frequency of cutting influenced (P < 0.05) the chemical composition, where decreased cutting frequency significantly increased the levels of dry matter, neutral detergent fiber, acid detergent fiber, cellulose, and ash in two fractions evaluated (leaf and stem); the crude protein content showed a decline from the moment the frequency of cutting was increased. The LAI, and productive and chemical characteristics of elephant grass were influenced by increased frequency of cutting. Limiting the cutting of the grass to 60 days implies an optimal point of production and quality.Objetivou-se avaliar a interceptação luminosa (%IL), índice de área foliar (IAF), as características produtivas e químicas do capim-elefante (Pennisetum purpureum Schum) sob diferentes frequências de corte (30, 45, 60, 75 e 90 dias após o corte). Utilizou-se o delineamento inteiramente casualizado, com cinco repetições e cinco tratamentos (frequências de corte). A composição química foi analisada em arranjo fatorial 2x5 (duas frações: folha e colmo e cinco frequências de corte). O padrão de variação da IL e IAF em função das frequências de corte foi de ordem crescente. Os máximos valores de IL e IAF ocorreram aos 75 e 90 dias de corte com 98,46 %; 98,72% (%IL) e 7,08; 8,10 (IAF), respectivamente. Houve efeito das frequências de corte para a produção total de forragem, produção de folhas, produção de colmo, material morto, perfilhos vivos, perfilhos mortos e altura. Apenas a relação folha/colmo não foi influenciada (P > 0,05) pelos fatores estudados. As frequências de corte influenciaram (P < 0,05) a composição química, onde a diminuição da frequência aumentou significativamente os teores de matéria seca, fibra em detergente neutro, fibra em detergente ácido, celulose e cinzas nas duas frações avaliadas (folha e colmo), já o teor de proteína bruta apresentou queda a partir do momento que aumentou as frequências de corte. O Índice de área foliar, as características produtivas e químicas do capim-elefante são influenciadas pelo aumento na frequência de corte. O...

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Classes de perfilhos na composição do índice de área foliar em pastos de capim-elefante

Cited by 11 publications

References 12 publications

Producción y características morfologicas de genotipos de pasto elefante enano (Pennisetum purpureum, Schum) sobre pastoreo

Producción y características morfologicas de genotipos de pasto elefante enano (Pennisetum purpureum, Schum) sobre pastoreo

Chemical composition and photosynthetically active radiation of forage grasses under irrigation

Light interception, chemical, and productive characteristics of elephant grass subjected to different cutting intervals

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