Características do pasto e acúmulo de forragem em capim-tanzânia submetido a alturas de manejo do pasto

Canto, Marcos Weber do; Jobim, Clóves Cabreira; Gasparino, Eliane; Hoeschl, André Ricardo

doi:10.1590/s0100-204x2008000300019

Cited by 16 publications

(16 citation statements)

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“…Canto et al (2008) confirmed that Tanzania grass under continuous stocking until the end of spring at pasture heights from 40 to 60 cm, provided sufficient quantities of leaves and high rates of accumulation of dry mass with restriction of the stems, a factor which improved the chemical composition. Thus, the endeavor of the present work was without irrigation, in the rainy season, respectively, confirmed by Ribeiro et al (2009), on Mombaça grass.…”

Section: Resultsmentioning

confidence: 63%

Yield, chemical composition and chlorophyll relative content of Tanzania and Mombaça grasses irrigated and fertilized with nitrogen after corn intercropping

et al. 2011

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-It was evaluated the effect of the absence and of application of three nitrogen doses (50, 100 and 200 kg ha -1 of N) and four harvest times in the winter/spring season (from July to October) on dry mass yield (DMY), on the relative chlorophyll contents (ICF -leaf chlorophyll index) and on the contents of total digestible nutrients (TDN), crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF) and lignin, and their respective correlations on Tanzania and Mombaça grasses after intercrop with corn in distroferric red latosol (Oxisol) soil as well. It was used a random block design, in split-plot with four replicates. The greatest DMY occured with the increase of photoperiod (from August), neverthless responses to nitrogen fertilization over cuts difered among the grasses. In an irrigated crop-livestock integration system under cerrado conditions, it is technically feasible the establishment of Tanzania and Mombaça grass intercroped with corn at sowing or if cover nitrogen fertilization is performed because even in the abscence of nitrogen fertilization, great satisfactory quantity of forage was produced, with average DMY of 2,000 kg ha -1 per cut during the highest shortage of roughage for animals (winter/spring). Nitrogen fertilization after corn harvest increases DMY and improves bromatologic composition of the grasses, as contents of chlorophyll and CP in winter/spring is increased, besides the increase of contents of TDN and a reduction on the contents of NDF and ADF until September. Leaf chlorophyll index can be used to estimate the DMY and CP content and as a marker of the need of nitrogen fertilization of Tanzania and Mombaça grasses submitted to cutting.Key Words: crop-livestock integration, crude protein, Megathyrsus maximum, neutral and acid detergent fiber, no-tillage system, total digestible nutrients Produtividade, composição bromatológica e teor relativo de clorofila dos capins tanzânia e mombaça irrigados e adubados com nitrogênio após o consórcio com milho RESUMO -Avaliou-se o efeito da ausência e da aplicação de três doses de nitrogênio (50, 100 e 200 kg ha -1 de N) e quatro épocas de corte no inverno/primavera (julho a outubro) sobre a produtividade de massa seca (PMS), os teores relativos de clorofila (ICF -índice de clorofila foliar) e os teores de nutrientes digestíveis totais (NDT), proteína bruta (PB), fibra em detergente neutro (FDN), fibra em detergente ácido (FDA) e lignina, bem como suas respectivas correlações nos capins tanzânia e mombaça após o consórcio com milho em um Latossolo Vermelho distroférrico. O delineamento experimental utilizado foi o de blocos casualizados, em parcelas subdivididas, com quatro repetições. As maiores PMS ocorreram com o aumento do fotoperíodo (a partir de agosto), no entanto, as respostas à adubação nitrogenada ao longo dos cortes diferiram entre e dentre os capins. Em sistema de integração lavoura-pecuária irrigado sob condições de cerrado, é tecnicamente viável o estabelecimento dos capins tanzânia e mombaça em consórcio c...

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Section: Resultsmentioning

confidence: 63%

Yield, chemical composition and chlorophyll relative content of Tanzania and Mombaça grasses irrigated and fertilized with nitrogen after corn intercropping

et al. 2011

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“…Under continuous grazing, grazing management strategies based on scientific research have been studied, so far, with few tropical forages (Pinto et al, 2001;Canto et al, 2008;Faria, 2009). In general, the results of these studies revealed forage accumulation patterns similar to those described for perennial ryegrass (Bircham & Hodgson, 1983), in which during the season of greatest growth, forage accumulation is reduced because of its smaller leaf area.…”

Section: Introductionmentioning

confidence: 99%

Forage accumulation in brachiaria grass under continuous grazing with single or variable height during the seasons of the year

2013

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-The objective of this study was to evaluate grazing management strategies of Brachiaria decumbens cv. Basilisk managed with different heights under continuous grazing with cattle. Two grazing management strategies were evaluated: maintenance of pasture with an average height of 25 cm throughout the experimental period and maintenance of pasture on the average of 15 cm in height during winter, up to 25 cm from the beginning of spring. The split-plot scheme and the randomized block design with four replications were adopted. The grazing management strategies corresponded to the primary factor, while the seasons (winter, spring and summer) corresponded to secondary factor. The reduction of the average sward height to 15 cm in the winter resulted, when compared with pasture maintained at 25 cm, in overall higher growth rates (95 kg/ha.day DM) and leaf blade (66.1 kg/ha.day DM), as well as higher rates of total accumulation (81.5 kg/ha.day DM) and leaf blade (52.6 kg/ha.day DM). The accumulated forage production (from winter to summer) was higher in the pasture lowered to 15 cm in winter (25.6 t/ha DM) compared with that managed with an average height of 25 cm (22.2 t/ha DM). Regarding the seasons of the year, in the winter, there were lower rates of overall growth (6.4 kg/ha.day DM), leaf blade (5.6 kg/ha.day DM) and pseudostem (0.8 kg/ha.day DM), and also lower total (-6.6 kg/ha.day DM) and leaf blade (-7.5 kg/ha.day DM) accumulation rates. In the spring there was a higher rate of leaf senescence (22.4 kg/ha.day DM). The accumulation of forage is incremented when the pasture of B. decumbens is lowered to 15 cm during the winter, and in the spring and summer, its average height is increased to 25 cm.

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“…O efeito imediato da intensidade de desfolhação sobre a gramínea é a redução de sua área foliar e, consequentemente, da capacidade em interceptar luz e redução global da fotossíntese, as quais são afetadas pela proporção de tecido removido; o grau de desfolha das plantas vizinhas e a capacidade fotossintética do tecido foliar remanescente após a desfolhação (Costa et al, 2006, Canto et al, 2008, Pereira, 2013. Após a desfolhação ocorre rápido declínio na quantidade de carboidratos solúveis nas raízes, como consequência da redução na taxa fotossintética da planta como um todo e alocação preferencial de carbono para as partes áreas da planta com a finalidade de restaurar sua área foliar (Costa et al, 2008, Lemaire et al, 2011, Santos et al, 2011.…”

Section: Resultsunclassified

Características morfogenéticas y estructurales de Megathyrsus maximus cv. Tanzânia-1 bajo intensidades de defoliación

Costa¹,

Jank

Magalhães

et al. 2018

Pubvet

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RESUMO. O efeito de intensidades de desfolhação (20, 30, 40 e 50 cm acima do solo) sobre a produção de forragem e características morfogênicas e estruturais de Megathyrsus maximus cv. Tanzânia-1 foi avaliado nos cerrados de Roraima. Os efeitos das intensidades de desfolhação sobre a produção de matéria seca verde, índice de área foliar e taxa de expansão de folhas foram ajustados ao modelo quadrático de regressão e os máximos valores registrados com cortes a 40,9; 38.7 e 35,5 cm acima do solo, respectivamente. A densidade populacional de perfilhos, taxa de aparecimento de folhas e número de folhas perfilho -1 foram inversamente proporcionais à intensidade de desfolhação, ocorrendo o inverso quanto ao comprimento médio de folhas e taxa de senescência foliar. A eliminação de meristemas apicais foi incrementada com o aumento da intensidade de desfolhação. O vigor de rebrota foi direta e negativamente correlacionado com a intensidade de desfolhação.Palavras chave: Folhas, matéria seca verde, perfilhamento, senescência Morphogenetic and structural characteristics of Megathyrsus maximus cv. Tanzânia-1 under defoliation intensitiesABSTRACT. The effect of defoliation intensities (20, 30, 40 and 50 cm above soil level) on green dry matter (GDM) yield and morphogenetic and structural characteristics of Megathyrsus maximus cv. Tanzânia-1 were evaluated under field conditions in Roraima´s savannas. The effects of defoliation intensities on the GDM yields, leaf area index and leaf elongation rates was adjusted to the quadratic regression model and maximum values recorded with cutting at 40.9; 38.7 and 35.5 cm above soil level, respectively. The population tiller density, number of leaves plant -1 and leaf appearance rate was inversely proportional to the intensity of defoliation, while the opposite occurred for to medium blade length and leaf senescence rate. Apical meristem removing percentage was higher with increasing defoliation intensity. Aftermath regrowth showed close negative correlation with defoliation intensity level.

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Características do pasto e acúmulo de forragem em capim-tanzânia submetido a alturas de manejo do pasto

Cited by 16 publications

References 20 publications

Yield, chemical composition and chlorophyll relative content of Tanzania and Mombaça grasses irrigated and fertilized with nitrogen after corn intercropping

Yield, chemical composition and chlorophyll relative content of Tanzania and Mombaça grasses irrigated and fertilized with nitrogen after corn intercropping

Forage accumulation in brachiaria grass under continuous grazing with single or variable height during the seasons of the year

Características morfogenéticas y estructurales de Megathyrsus maximus cv. Tanzânia-1 bajo intensidades de defoliación

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