Repetibilidade e respostas de características morfofisiológicas e produtivas de capim-elefante de porte baixo sob pastejo

Viana, Bruno Leal; Mello, Alexandre Carneiro Leão de; Lira, Mário de Andrade; Júnior, José Carlos Batista Dubeux; Santos, Mércia Virgínia Ferreira dos; Cunha, Márcio Vieira da; Ferreira, Geane Dias Gonçalves

doi:10.1590/s0100-204x2009001200024

Cited by 10 publications

(7 citation statements)

References 13 publications

(11 reference statements)

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“…Critical values of leaf area index, close to those of the present study, were demonstrated by Viana et al (2009), working with repeatability and determination of coefficients with cultivars of Pennisetum purpureum Schum. of small size under sheep grazing and by Mello and Pedreira (2004) maximum Jacq.)…”

Section: Resultssupporting

confidence: 86%

<b>Morphogenesis and productivity of Pioneiro elephant grass under different residual heights and light interceptions

Sales¹,

Saraiva²,

Reis³

et al. 2014

Acta Sci. Anim. Sci.

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The aim of this study was to assess two residual heights and two light interceptions on morphogenetic, structural and productive characteristics of Pennisetum purpureum Schum. cv. Pioneiro. The experiment was a factorial randomized block design with four replications. We evaluated morphogenetic characteristics in three basal tillers tagged in each plot, in different tussocks. Tiller population density was evaluated in marked areas in all experimental units. The interaction between the factors significantly influenced the leaf and pseudostem elongation rate, the leaf appearance rate, phyllochron, number of leaves per tiller, green leaves per tiller, final leaf blade length, leaf area index and biomass yield. There were no changes in the leaf senescence rate, number of senescent leaves per tiller and tiller density. Most morphogenetic variables was affected by the interactions between factors which also influenced the productivity, allowing to set the treatment with 50 cm residual height and cut to reach values near 95% light interception as the one with the best results for the variables analyzed.

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Section: Resultssupporting

confidence: 86%

<b>Morphogenesis and productivity of Pioneiro elephant grass under different residual heights and light interceptions

Sales¹,

Saraiva²,

Reis³

et al. 2014

Acta Sci. Anim. Sci.

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“…In this way, the choice of a cutoff frequency combined with the use of %IL, become viable alternatives for use as a way to optimize the productivity of animal production systems. Viana et al (2009), who evaluated clones of elephant grass grazed under intermittent animal stocking, with rest periods of 32 and 64 days, observed values of 86.5 and 91.2 % IL, which are close to those found in this experiment of 92.88% (30 days) and 96.22% (60 days), respectively.…”

Section: Resultssupporting

confidence: 86%

“…Viana et al (2009), who evaluated clones of elephant grass grazed under intermittent animal stocking, with rest periods of 32 and 64 days, observed values of 86.5 and 91.2 % IL, which are close to those found in this experiment of 92.88% (30 days) and 96.22% (60 days), respectively. The high values we observed may have been influenced by favorable climatic conditions during the experimental period, in addition to the use of nitrogen fertilization administered at a single time, influencing rapid vegetative regrowth of harvested forage.…”

supporting

confidence: 86%

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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“…Thus, both, tall plants with low density and short plants with high density can occur with high values of LAI and LI. Viana et al (2009) estimated the coefficients of repeatability, determination (R 2 ), and minimum number of measurements necessary to predict the real value of morphophysiological and productive variables, as well as short-type elephantgrass responses to sheep grazing. They observed that for the variables LAI, LI, and mean plant height, only one measurement (R 2 = 80%) was necessary to classify them as an easy predictor to elephantgrass entries in long cycle.…”

Section: Discussionmentioning

confidence: 99%

Canopy structure and forage nutritive value of elephantgrass subjected to different stocking rate and N fertilization in the “Mata Seca” ecoregion of Pernambuco

Dourado¹,

Júnior

Mello

et al. 2019

R. Bras. Zootec.

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The objective was to evaluate the effect of three stocking rates (2, 3.9, and 5.8 animal units ha −1) and three fertilization levels (0, 150, and 300 kg N ha −1 yr −1) on herbage mass and nutritive value of elephantgrass (Pennisetum purpureum Schum.) cv. IRI-381. The experiment was conducted from May to August of 2009 and 2010 in Itambé, PE, Brazil, during the rainy season. Treatments were allocated in a split-plot arrangement in a completely randomized block design. The variables measured included leaf mass (pre-and post-grazing), botanical composition, soil cover, leaf area index, light interception, leaf angle, and concentrations of dry matter, organic matter, N, and in vitro digestible dry matter. When fertilized with 300 kg N ha −1 yr −1 , leaf mass reached 18,560 kg ha −1. Leaf area index decreased with increasing stocking rate. The relationship between sward height and light interception was R 2 = 0.0126. Increased stocking rate resulted in greater contribution of signalgrass [Brachiaria decumbens (Stapf.) R.D. Webster] in the botanical composition, with a contribution up to 29% in 2010. Elephantgrass nutritive value is directly affected by the fertilization levels and stocking rate, with highest nutrient concentrations observed with 2 AU ha −1 and 300 kg N ha −1 yr −1 .

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Repetibilidade e respostas de características morfofisiológicas e produtivas de capim-elefante de porte baixo sob pastejo

Cited by 10 publications

References 13 publications

<b>Morphogenesis and productivity of Pioneiro elephant grass under different residual heights and light interceptions

<b>Morphogenesis and productivity of Pioneiro elephant grass under different residual heights and light interceptions

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

Canopy structure and forage nutritive value of elephantgrass subjected to different stocking rate and N fertilization in the “Mata Seca” ecoregion of Pernambuco

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