Acúmulo de forragem em pastos de Brachiaria decumbens adubados com nitrogênio

Fagundes, Jaílson Lara; Fonseca, Dilermando Miranda da; Gomide, José Alberto; Nascimento, Domicio do; Vitor, Cláudio Manoel Teixeira; Morais, Rodrigo Vieira de; Mistura, Claúdio; Reis, Gilberto da Cunha; Martuscello, Janaína Azevedo

doi:10.1590/s0100-204x2005000400012

Cited by 92 publications

(96 citation statements)

References 7 publications

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“…The nitrogen, as presented in this study (Table 2) and reported in literature (MORAIS et al 2006;BASSO et al, 2010), promotes significant increases in tiller appearance, resulting in a plant population constantly renewed and with high production potential (FAGUNDES et al, 2005), since new emerged tillers have a higher responsiveness to stimulation from the environment (BULLOCK et al, 1994).…”

Section: Resultssupporting

confidence: 63%

Tillering dynamics in massai grass fertilized with nitrogen and grazed by sheep

et al. 2016

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ABSTRACT:To evaluate the tillering dynamics of massai grass under rotational sheep stocking and fertilized with nitrogen (control -0; 400; 800 and 1200 kg ha -1 year -1 ), this study was carried out, in a completely randomized design with repeated measures over time. The mob-grazing technique was applied to perform the grazing by employing groups of animals for rapid defoliation. The tiller appearance, survival and mortality rates, tiller biomass, and green/dead tillers ratio, have presented increase responses to nitrogen levels, with the three rates and the tiller biomass varying between evaluation periods. There was a quadratic response for the tiller flowering rate, population density of vegetative and reproductive tillers, reaching maximum values (0.051 tiller 100 tiller -1 day -1 ; 4,818 and 35 tillers m -2 , respectively) under the nitrogen levels of 613.5; 993.5 and 623.9 kg ha -1 year -1 , respectively. For the tiller flowering rate and population density of reproductive tillers, it was verified a fluctuation between periods. The nitrogen fertilization promotes positive changes in tillering dynamics of massai grass, allowing the use of up to 800 kg ha -1 year -1 for maintaining the pasture stability. The tillering demography of the forage had varied little between assessment periods.

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Section: Resultssupporting

confidence: 63%

Tillering dynamics in massai grass fertilized with nitrogen and grazed by sheep

et al. 2016

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“…An increasing linear response (P<0.05) was recorded for LER with increasing nitrogen levels, estimating values of 2.32 and 5.14 cm tiller Alexandrino et al, 2004;Fagundes et al, 2005), which can be especially attributed to the increase in cell production (cell division) (Volenec & Nelson, 1984), a result of deposition of nutrients, especially nitrogen, in the areas of elongation and cell division of leaves (Skinner & Nelson, 1995). Also, according to Fagundes et al (2005), the effect of nitrogen fertilization on the leaf elongation rate can be related to the great influence of nitrogen on physiological processeses of the plant, resulting in an increase of that variable.…”

Section: Resultsmentioning

confidence: 93%

“…Also, according to Fagundes et al (2005), the effect of nitrogen fertilization on the leaf elongation rate can be related to the great influence of nitrogen on physiological processeses of the plant, resulting in an increase of that variable. The leaf elongation rate is of great relevance in the biomass flow of plants, once it is directly associated with biomass production.…”

Section: Resultsmentioning

confidence: 99%

Biomass flow in massai grass fertilized with nitrogen under intermittent stocking grazing with sheep

et al. 2013

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-This study evaluated the biomass flow of massai grass in regrowth subjected to different nitrogen levels (control -no fertilization; 400; 800; and 1200 N kg ha -1 year -1 ) and under rotational stocking with sheep, in a completely randomized design with repeated measures over time. The leaf elongation rate increased with increasing nitrogen levels (N) and the fourth grazing cycle presented a lower value compared with the others. The stem elongation rate responded linearly with increasing levels of N, but it was not influenced by grazing cycles. The senescence rate of leaves remaining before grazing and after grazing were not influenced by the nitrogen fertilization or amended with successive grazing cycles. The phyllochron was influenced only by the nitrogen fertilization, with a decreasing linear response with nitrogen levels. Quadratic response was observed for the average length of leaves with increasing N levels and the grazing cycle 4 presented the lowest value for this variable. For each kilogram N ha -1 year -1 , increases of 0.161 and 0.1604 kg ha -1 day -1 were verified in the herbage growth and accumulation rates, respectively. Nitrogen fertilization favors the biomass flow of massai grass, promoting an expressive increase in the production and accumulation of forage.

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“…O nitrogênio possui grande destaque na produção de massa seca, sendo um dos principais nutrientes a proporcionar maior perfilhamento e produção, melhorando a qualidade da forragem produzida e aumentando a capacidade de animais por área. Fagundes et al (2005) verificaram que o suprimento de N no solo, normalmente, não atende à demanda das gramíneas, porém, quando a adubação nitrogenada é realizada, observam-se grandes alterações na taxa de acúmulo de massa seca da forragem do capim-braquiária, ao longo das estações do ano. Ruggieri et al (1995) 30, 30 e 34 dias, respectivamente.…”

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Produtividade e composição bromatológica do capim-marandu a fontes e doses de nitrogênio

et al. 2008

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RESUMOObjetivou-se, no trabalho, avaliar o efeito de doses e fontes de nitrogênio nas características produtivas e qualitativas da Brachiaria brizantha cv. Marandu. O delineamento experimental utilizado foi o de blocos ao acaso, em esquema fatorial 5x3x3 (5 doses de N, 3 fontes de nitrogênio e 3 cortes), com 4 repetições. As doses de N foram: 0, 50, 100, 150, 200 kg/ha/corte, com as fontes: Entec sulfonitrato de amônio + inibidor de nitrificação (dimetilpirazolfosfato), Sulfato de Amônio e Uréia, sendo os cortes realizados em novembro/2006, dezembro/2006 e janeiro/2007. As coletas foram realizadas com intervalos entre corte de 30, 30 e 34 dias onde se determinou a produtividade de massa seca, teor de proteína bruta (PB), fibra em detergente neutro (FDN), fibra em detergente ácido (FDA), nutrientes digestíveis totais (NDT) e teor de clorofila. As leituras no clorofilômetro foram lineares crescentes quando se utilizaram o Entec e a Uréia, até 200 kg/ha de N e, até 174 kg/ha de N, com a utilização do Sulfato de amônio; apresentando correlação significativa com os teores de N na planta. Independente da fonte nitrogenada, a aplicação de doses crescentes de até 200 kg de N/ha/aplicação na forrageira Brachiaria brizantha cv. Marandu proporcionou incremento na produção de massa seca, melhorando a composição bromatológica por aumentar os teores de PB e NDT e, diminuição dos teores de FDN e FDA.Termos para indexação: Adubação, Brachiaria brizantha, pastagens, produtividade de massa seca. ABSTRACTThis study aimed to evaluate the effect of doses and sources of nitrogen in the productivity and quality characteristics of Brachiaria brizantha cv. Marandu. A randomized block design in a factorial scheme 5x3x3, with 4 repetitions was used. The treatments were constituted by 5 doses of nitrogen: 0, 50, 100, 150, 200 kg/ha/cut, 3 sources: Entec amonium sulfonitrate + nitrification inhibitor -dymethilpirazolphosphate, Ammonium sulfate and Urea, in 3 cuts, accomplished with intervals of 30, 30 and 34 days to evaluate the production of dry mass, crude protein content (PB), neutral detergent fiber (NDF), acid detergent fiber (ADF), total digestible nutrients (NDT) and chlorophyll content. The chlorophilometer data increased when user as a function of N doses with Entec and Urea sources and up to 174 kg/ha of N with ammonium sulfate; showing significant correlation with N content in plants. Independently of the source, the application up to 200 kg N/ha/application in Brachiaria brizantha cv. Marandu provided increment in the production of dry mass improving the quality composition for increasing the PB and NDT content and, decreasing the FDN and FDA contents. Index terms: INTRODUÇÃOO Brasil é o maior produtor comercial de bovinos do mundo, devido a vários fatores, especialmente os climáticos, que favorecem a produção de forragens nas diferentes localidades e períodos do ano. A atividade pecuária está sendo uma das principais atividades responsáveis pelo crescimento econômico do país.As pastagens totalizam aproximadamente 25% da superf...

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Acúmulo de forragem em pastos de Brachiaria decumbens adubados com nitrogênio

Cited by 92 publications

References 7 publications

Tillering dynamics in massai grass fertilized with nitrogen and grazed by sheep

Tillering dynamics in massai grass fertilized with nitrogen and grazed by sheep

Biomass flow in massai grass fertilized with nitrogen under intermittent stocking grazing with sheep

Produtividade e composição bromatológica do capim-marandu a fontes e doses de nitrogênio

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