Fluxo de biomassa em capim-massai durante o estabelecimento e rebrotação com e sem adubação nitrogenada

Lopes, Marcos Neves; Cândido, Magno José Duarte; Pompeu, Roberto Cláudio Fernandes Franco; Silva, Rodrigo Gregório da; Lopes, José Wellington Batista; Fernandes, F. R.; Lacerda, Claudivan Feitosa de; Bezerra, Francisco Marcus Lima

doi:10.1590/s0034-737x2013000300009

Cited by 21 publications

(15 citation statements)

References 17 publications

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“…This result may be explained by the simple fact that the larger production caused by greater nitrogen assimilation increased metabolic rates, which in turn leads to a higher senescence rate. This finding is important for the management of deferred pastures, because increase in nitrogen fertilization without a corresponding increase in the animal stocking rate for consuming the forage, might increase senescence rates, thereby reducing the efficiency of the production system (LOPES et al, 2013).…”

Section: Resultsmentioning

confidence: 98%

Agronomic and nutritional characteristics of Massai grass subjected to deferred grazing and nitrogen fertilization

Costa

Rodrigues

Araújo

et al. 2017

SCA

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This study aimed to evaluate the agronomic characteristics and nutritional value of Massai grass (Megathyrsus maximus 'Massai') pastures fertilized with different nitrogen levels and subjected to deferred grazing. A completely randomized experimental design (CRD) was adopted, with including five nitrogen levels (zero, 100, 200, 300, and 400 kg ha −1 ), and five replications (plots). The degradability trial used a CRD including a 6 × 5 factorial arrangement, consisting of six rumen-incubation times (6, 24, 48, 60, 84, and 96 h) and five levels of nitrogen in different plots. One fistulated sheep, with a live weight of 60 kg, was used in the experiment. Total herbage biomass, dead herbage biomass, and height showed a quadratic response to nitrogen fertilization levels of 100 to 200 kg ha -1 resulted in greater tillering. Protein and dry matter content increased linearly with nitrogen fertilization level, leading to increase in fibrous components. The increase in NDF and ADF contents might be a consequence of the reduction in NCE, and the high flowering rate of the grass, owing likely to the reduction in metabolism of the grass in an attempt to extend its lifetime. Nitrogen levels of 300 kg ha −1 or higher affected the productive characteristics positively, whereas the chemical characteristics were negatively affected. Key words: Deferred period. Degradability of dry matter. Megathyrsus. Nitrogen fertilization. ResumoObjetivou-se avaliar as características agronômicas e valor nutritivo do capim-Massai (Megathyrsus maximus 'Massai') submetido a diferimento e doses crescentes de nitrogênio. O delineamento experimental adotado foi o inteiramente casualizado (DIC) com cinco doses de nitrogênio (zero, 100; 200; 300 e 400 kg de N ha -1 ) com cinco repetições (parcelas). O ensaio de degradabilidade foi estruturado em DIC, com arranjo fatorial 6x5, seis tempos de incubação no rúmen (6, 24, 48, 60, 84 e 96 h) e cinco doses de N em parcelas diferidas. Utilizou-se um ovino fistulado com peso vivo de 60 kg. A biomassa de forragem total, morta e a altura respondeu à adubação nitrogenada de forma quadrática. A adubação nitrogenada nas doses 100 a 200 kg de N ha -1 proporcionou maior perfilhamento. A adubação nitrogenada proporcionou resposta linear sobre os teores de proteína e matéria seca em consequência também aumentou os constituintes fibrosos. O amento dos teores de FDN e FDA pode ser uma consequência da redução da ECN e da taxa de florescimento da gramínea, devido provavelmente à redução no metabolismo na tentativa de prolongar sua vida útil. A partir da dose de 300 kg de N ha -1 resultou em redução da degradação da matéria seca do capim-Massai. As doses de N influenciaram positivamente as características produtivas e negativamente as características químicas. Palavras-chave: Adubação nitrogenada. Degradabilidade da MS. Megathyrsus. Período de diferimento.

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Section: Resultsmentioning

confidence: 98%

Agronomic and nutritional characteristics of Massai grass subjected to deferred grazing and nitrogen fertilization

Costa

Rodrigues

Araújo

et al. 2017

SCA

Self Cite

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“…According to Lopes et al (2013), Massai guineagrass has a favorable genotype for leaf production, because they did not observe an increase in stem elongation rate, even with high doses of nitrogen, but the grass mostly responded to the fertilization with biomass leaf production. Note.…”

Section: Resultsmentioning

confidence: 99%

Sward Structure and Herbage Accumulation of Massai Guineagrass Pastures Managed According to Pre-Grazing Heights, in the Northeast of Brazil

Neto¹,

Difante²,

Lana³

et al. 2017

JAS

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The forage sward height measurement is a practical and potential tool for grazing management. Thus, the objective of this study was to evaluate the structure of pasture and forage accumulation related to sward pre-grazing height of Panicum maximum cv. Massai, before being grazed by sheep. The study was conducted in the Federal University of Rio Grande do Norte, Macaíba, Brazil. The treatments were the pre-grazing sward heights at: 35, 40, 45 and 50 cm. The post-grazing height was 15 cm for all treatments. The interaction between the pre-grazing sward heights and grazing cycles was only statistically significant for light interception (LI) and leaf area index (LAI). The LI had linear and positive effect to the pre-grazing heights in only one of three grazing cycles, with approximately 1% increase in LI for each centimeter grown in the sward. The total forage mass had linear regression, every centimeter increased in height, there was a correspondent dry matter (DM) increase of 187 kg ha -1 in forage mass. There was a linear response between leaf blade mass and dead material with sward height. The post-grazing lowest LI was 29.42% at 42.05 cm high. The lowest amount of LI was 29.42% at 42.05 cm high. The minimum LAI was 0.69. The top DM and mineral matter (MM) accumulation rate were linear and had 58.32 and 20.46 kg ha -1 day -1 MS, respectively. Massai guineagrass grazed by sheep must be handled between 35 and 40 cm high at pre-grazing when associated with post-grazing height of 15 cm.

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“…O comportamento mostrado pela produção de forragem ratifica a importância do nitrogênio para o incremento de biomassa, em forrageiras manejadas intensivamente (loPEs et al, 2013b). Os resultados obtidos estão de acordo com araúJo et al (2011), que destacaram que a utilização de estercos como única fonte de N é insuficiente para que a planta demonstre todo seu potencial genético, uma vez que não há quantidade de N prontamente disponível.…”

Section: Resultsunclassified

Produção e estrutura de pastos de capim-massai adubado com dejetos da produção animal

et al. 2016

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RESUMO: Objetivou-se avaliar o efeito do uso de adubos orgânicos e mineral na estrutura e na produção de forragem do Panicum maximum cv. Massai. O experimento foi desenvolvido na fazenda escola do Instituto Federal de Educação, Ciência e Tecnologia do Rio Grande do Norte, campus Apodi. Os tratamentos avaliados foram fontes orgânicas de nitrogênio (dejetos da suinocultura, da avicultura e da ovinocultura) e uma fonte mineral (ureia), fixados em 150 kg/ha de N. Avaliouse a produção de forragem e de componentes morfológicos, a altura do pasto, a interceptação luminosa, o índice de área foliar e o teor de clorofila, em cortes realizados a cada 60 dias. A altura do dossel foi afetada pelo tipo de adubo aplicado, e maior altura foi observada no pasto adubado com ureia (50,97 cm). A maior interceptação de luz (IL) pelo dossel foi observada nos pastos que receberam ureia, porém não alcançaram 95% de IL. O índice de área foliar nos pastos adubados com ureia foi maior que nos demais, e os valores observados nos pastos que receberam adubos orgânicos foram considerados muito baixos. As massas de forragem, de lâmina foliar, de colmo e de material morto foram afetadas pelo tipo de adubo, e foram maiores nos pastos que receberam ureia. Os teores de clorofila total nas lâminas foliares não diferiram entre os adubos avaliados. A estrutura e a produção de forragem em pastos de capim-massai não são afetadas pelo tipo de dejetos de produção animal utilizado como fonte de nitrogênio. A eficiência destes adubos orgânicos como fonte de nitrogênio é inferior à da adubação mineral. Os dejetos de produção animal avaliados podem ser utilizados como fonte de nitrogênio para pastos de capim-massai em condições de baixo custo e para diminuir os impactos ambientais.Palavras-chave: adubo orgânico, Panicum maximum, ureia. PRODUCTION AND STRUCTURE OF MASSAI GRASS PASTURES FERTILIZED WITH ANIMAL MANURESABSTRACT: The objective of this study was to evaluate the effect of organic and mineral fertilizers on the structure and production of Panicum maximum cv. Massai forage. The experiment was conducted at the teaching farm of Instituto Federal de Educação, Ciência e Tecnologia do Rio Grande do Norte, Apodi Campus. The treatments evaluated were organic sources of nitrogen (wastes of pig, poultry and sheep farming) and a mineral source (urea), set at 150 kg N/ha. Forage production, morphological components, pasture height, light interception, leaf area index, and chlorophyll content were evaluated in samples obtained at intervals of 60 days. Canopy height was affected by the type of fertilizer applied and the greatest height was observed for pasture fertilized with urea (50.97 cm). The highest light interception by the canopy was observed for pastures receiving urea, but 95% light interception was not reached. The leaf area index was higher for pastures fertilized with urea compared to the other treatments and the values obtained for pastures receiving organic fertilizers were considered very low. Forage, leaf blade, stem and dead material mass was affe...

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Fluxo de biomassa em capim-massai durante o estabelecimento e rebrotação com e sem adubação nitrogenada

Cited by 21 publications

References 17 publications

Agronomic and nutritional characteristics of Massai grass subjected to deferred grazing and nitrogen fertilization

Agronomic and nutritional characteristics of Massai grass subjected to deferred grazing and nitrogen fertilization

Sward Structure and Herbage Accumulation of Massai Guineagrass Pastures Managed According to Pre-Grazing Heights, in the Northeast of Brazil

Produção e estrutura de pastos de capim-massai adubado com dejetos da produção animal

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