Growth of marandu palisadegrass subjected to strategies of intermittent stocking

Giacomini, Alessandra Aparecida; Silva, Sila Carneiro da; Sarmento, Daniel Oliveira de Lucena; Zeferino, Cauê Varesqui; Júnior, Salim Jacaúna Souza; Trindade, Júlio Kuhn da; Guarda, V. D. A.; Júnior, Domicio do Nascimento

doi:10.1590/s0103-90162009000600003

Cited by 62 publications

(72 citation statements)

References 11 publications

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“…When evaluating the Xaraés palisade grass with 16.2 cm for the average residual height, Pedreira, Pedreira and Silva (2007) found 22 days on average for the rest periods during the spring/ summer period. The rest period that was observed in this study is lower than that found by Giacomini et al (2009) for marandu palisade grass. From October to March 2004 and from October to December 2005, this author found an average grazing interval of 45.7 and 28.7 days for pastures with post-grazing heights of 10 and 15 cm, respectively.…”

Section: Resultscontrasting

confidence: 79%

“…This finding reinforces the need to establish variable rest periods based on pasture growth. Giacomini et al (2009) proposed that canopy heights under 95% light were more suitable for use when marandu palisade grass is close to 25 cm; however, in this study, the post-grazing heights in use ranged from 10 to 15 cm. Likewise, Gimenes et al (2011) studied pre-grazing heights of 25 and 35 cm and nitrogen doses of 50 and 200 kg/ha/year in marandu palisade grass, and they concluded that ideal management would take place at pre-grazing heights of 25 cm and 15 cm residue.…”

Section: Resultscontrasting

confidence: 61%

“…Studies to evaluate the influence of the resting period when using 95% light interception (LI) have been recently conducted (Difante et al, 2009;Giacomini et al, 2009;Trindade et al, 2007). However, only the works of Pedreira, Pedreira, and Silva (2007) and Voltolini et al (2010) aimed to compare the rotational stocking method while using a fixed defoliation frequency and a variable frequency based on 95% LI in Xaraés (Brachiaria brizantha cv.…”

Section: Introductionmentioning

confidence: 99%

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Forage mass and morphological composition of Marandu palisade grass pasture under rest periods

et al. 2016

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An evaluation of productive potential is not the only factor used to determine grazing management efficiency; it is also necessary to know the structural characteristics of the canopy. The objective of this study was to evaluate the effects of two management styles on Marandu palisade grass pastures under rotational stocking with respect to the herbage mass, morphological composition, and structural characteristics of the pasture. The treatments under consideration were a) a fixed rest period of 30 days (RP30) or b) a rest period based on the time necessary for the canopy to reach 95% light interception (LI95). The experimental design was a completely randomized block with two blocks and three replicates within the blocks. Animals were placed in the paddocks when the grass reached the established management criteria, which were maintained for three days to reach 25 cm in stubble height. Shorter grazing intervals (22.8 vs. 30 days), lower pre-grazing heights (35.9 vs. 42.3 cm), and lower forage masses (4,411 vs. 5,290 kg/ha.cycle) were observed in LI95 pastures. The LI95 treatment had a higher leaf percentage (48.3 vs. 41.1) and the lowest percentage of dead forage (19.0 vs. 25.4) in the pre-grazing forage mass of the pasture in relation to that of RP30. Performing pasture management based on RP30 throughout the season is harmful to the pasture structure because it reduces the leaf percentage and increases the stem and senescent material in the available forage. The lower pre-grazing forage mass observed under LI95 management is offset by more grazing cycles within the rainy season.Index terms: Pre-grazing height; Grazing cycle; interception of photosynthetically active radiation; leaf mass. RESUMOA avaliação do potencial produtivo do pasto não é o único fator que pode ser usado para determinar a eficiência de manejo do pastejo, também é necessário considerar as características estruturais do dossel. Neste estudo, objetivou-se avaliar a influência de dois critérios para definição do período de descanso do pasto de capim-marandu sobre a massa de forragem, a composição morfológica e as características estruturais do pasto durante a estação chuvosa. Os períodos de descanso estudados foram: fixo de 30 dias (PD30) e variável, conforme a interceptação de 95% da radiação fotossinteticamente ativa (IL95). O delineamento experimental utilizado foi em blocos inteiramente casualizados, com duas repetições de área e três repetições dentro de bloco. Os animais (vacas mestiças) foram colocados nos piquetes, logo que os pastos atingiam os critérios de manejo estabelecidos e permaneciam dentro dos mesmos durante três dias, de forma a atingir a altura de resíduo de 20-25 cm. Menor intervalo entre pastejo (22,8 vs. 30 dias), menor altura pré-pastejo (35,9 vs. 42,3 cm) e menor massa de forragem verde (4.411 vs. 5.290 kg/ha.ciclo) foram observados no pasto sob IL95. Contudo, o pasto sob IL95 apresentou maior percentual de lâmina foliar (48,3 vs. 41,1) e menor percentual de material morto (19,0 vs. 25,4) na massa de forragem ...

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Section: Resultscontrasting

confidence: 79%

Section: Resultscontrasting

confidence: 61%

Section: Introductionmentioning

confidence: 99%

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Forage mass and morphological composition of Marandu palisade grass pasture under rest periods

et al. 2016

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“…This plant has been evaluated with a reductionist approach based on morphogenesis allied to a tight control of sward structure by frequency and severity of defoliation (Marcelino et al, 2006;Giacomini et al, 2009). This new approach has enabled the generation of more consistent information allowing a better understanding of the factors that regulate forage production on tropical pastures (Da Silva & Nascimento Jr., 2007).…”

Section: Introductionmentioning

confidence: 99%

Morphogenetic and structural characteristics of andropogon grass submitted to different cutting heights

Sousa¹,

Júnior²,

Silva

et al. 2010

R. Bras. Zootec.

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-This work was performed aiming to evaluate the morphogenetic and structural characteristics of Andropogon gayanus cv. Planaltina species submitted to three cutting heights (20, 27 and 34 cm). The three cutting heights were allocated in experimental units (12 m 2 ) in a complete randomized block design with three replications. The cuts were done when the light interception by the sward reached 95%. At this moment, the sward height revealed itself constant with values close to 50 cm. The lowest cutting height (20 cm) influenced negatively the final leaf blade length, the number of live leaves, the leaf lifespan, the stem elongation rate and the tiller population density, and it influenced positively the phyllochron and the leaf senescence rate. Probably, cuts at 20 cm height caused a high decapitation and death of the tillers. The worst growth conditions in addition to the blossom of this specie occurred during fall resulted in higher stem elongation rates and number of live leaves, and lower phyllochron, final leaf blade length, and leaf lifespan. The sward height can be used as a practical and efficient criterion in the management of andropogon grass. Under intermittent management conditions, the regrowth of andropogon grass must be interrupted when the sward reaches 50 cm height, and the defoliation must be interrupted when the stubble height is close to 27 cm.Key Words: Andropogon gayanus, ecophysiology, light interception, morphogenesis, sward height Características morfogênicas e estruturais do capim-andropógon submetido a diferentes alturas de corte RESUMO -Este trabalho foi realizado com o objetivo de avaliar as características morfogênicas e estruturais da espécieAndropogon gayanus cv. Planaltina, submetida a três alturas de corte (20, 27 e 34 cm). As três alturas de corte foram alocadas às unidades experimentais (12 m 2 ) em delineamento de blocos completos casualizados com três repetições. Os cortes foram realizados quando a interceptação luminosa pelo dossel atingiu 95%. A altura do dossel nesse momento mostrou-se constante, com valores próximos a 50 cm. A menor altura de corte (20 cm) influenciou negativamente o comprimento final da lâmina foliar, o número de folhas vivas, a duração de vida da folha, a taxa de alongamento de colmo e a densidade populacional de perfilhos, e positivamente o filocrono e a taxa de senescência de folhas. Provavelmente, cortes a 20 cm de altura causaram elevada decapitação e morte de perfilhos. As piores condições de crescimento junto do florescimento ocorrido durante o outono resultaram em maiores taxas de alongamento de colmos e número de folhas vivas e em menor filocrono, comprimento final da lâmina foliar e duração de vida da folha. A altura do dossel pode ser utilizada como critério prático e eficiente de manejo do capim-andropógon. Em condições de manejo intermitente, a rebrotação deve ser interrompida quando o dossel atingir 50 cm de altura, e a desfolhação, quando a altura de resíduo ficar próxima de 27 cm.

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“…Essa máxima produção somente será obtida se uma área apropriada de folhas interceptar a luz incidente (WARREN WILSON, 1961). De maneira geral, o conceito de IAF (Índice de Área Foliar) crítico, condição na qual 95% da luz incidente são interceptados, aplicado com sucesso em plantas de clima temperado, demonstrouse efetivo e válido também para o manejo de gramíneas tropicais , como demonstrado nos trabalhos realizados por Giacomini et al (2009a;2009b) (DEREGIBUS et al, 1983). O inverso ocorreu com o número de perfilhos mortos (Tabela 2), maior mortalidade de perfilhos ocorreu nos pastos submetidos à intensidade de corte de 10 cm e foi decrescendo conforme aumentou a altura de resíduo.…”

Section: Introductionunclassified

Acúmulo de forragem e estrutura do dossel do capim-Xaraés submetido a intensidades de cortes

Rodrigues

Lana

Júnior

et al. 2014

Rev. bras. saúde prod. anim.

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Growth of marandu palisadegrass subjected to strategies of intermittent stocking

Cited by 62 publications

References 11 publications

Forage mass and morphological composition of Marandu palisade grass pasture under rest periods

Forage mass and morphological composition of Marandu palisade grass pasture under rest periods

Morphogenetic and structural characteristics of andropogon grass submitted to different cutting heights

Acúmulo de forragem e estrutura do dossel do capim-Xaraés submetido a intensidades de cortes

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