Índice de área foliar, interceptação luminosa e acúmulo de forragem em pastagens de Cynodon spp. sob diferentes intensidades de pastejo

Fagundes, Jaílson Lara; Silva, Sila Carneiro da; Pedreira, Carlos Guilherme Silveira; Sbrissia, André Fischer; Carnevalli, Roberta Aparecida; Carvalho, Carlos Augusto Brandão de; Pinto, Luis Felipe de Moura

doi:10.1590/s0103-90161999000500016

Cited by 54 publications

(66 citation statements)

References 8 publications

(8 reference statements)

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“…Comparable forage accumulation rates were reported by Fagundes et al (1999), Carvalho et al (2000), and Bortolo et al (2001) in pastures maintained at different heights. The use of grazing exclusion cages is probably responsible for the non-detection of differences in FARs at different heights, as they can cause overestimation of FAR in lower canopies and underestimation of those kept higher (Bortolo et al 2001;Molan, 2004).…”

Section: Variablesmentioning

confidence: 52%

“…Despite the higher population density of basal tillers (TPDb) (Figure 2B), resulting in higher FAR (Table 6) in the summer, this did not lead to increase in MLB, because of the higher stocking rate required to maintain the canopy height during this period, when compared with other seasons (Flores et al, 2008). On the other hand, the increase in dead material (PDM) throughout the year is typical of tropical grass pastures under continuous stocking (Euclides et al, 1999(Euclides et al, , 2000Molan, 2004;Fagundes et al 1999Fagundes et al , 2006, because, during the growing season, there is accumulation of dead material associated with the natural senescence of grasses, which is accelerated by water stress. This was confirmed by the increase in mortality rates of basal (Table 3) and aerial (Table 5) tillers during the winter.…”

Section: Variablesmentioning

confidence: 95%

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Tillering and forage accumulation in Marandu grass under different grazing intensities

Calvano

Euclides²,

Montagner³

et al. 2011

Rev. Ceres

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Studies of plant responses to defoliation are important to develop pasture management strategies. The objective of this study was to evaluate the population density of basal, aerial and reproductive tillers, tiller appearance and mortality rates, forage accumulation and sward structure in Marandu grass pastures under different grazing intensities. The experimental period was from January to June 2006, divided in three seasons: summer, autumn and winter. The pastures were continuously grazed using variable stocking rates. The grazing intensities corresponded to 15, 30 and 45 cm of sward height. The experiment was arranged in a complete randomized block design with three treatments and two replicates. The sward heights were measured twice a week. The response variables were: forage accumulation, forage mass and its morphological components; and population densities of basal (TPDb), aerial (TPDa) and reproductive (TPDr) tillers. The highest TPDb (P > 0.05) was recorded for the shortest sward pasture, and the highest TPDr (P<0.05) for the tallest sward pasture. Swards showed a tiller size/density compensation mechanism and, consequently, the forage accumulation was similar (P > 0.05) among the grazing intensities. Pasture with a sward height of 35 cm had 94% of sun light interception. The highest variations in forage accumulation and sward structure were more influenced by seasonal differences than by grazing intensities. Pastures of Marandu grass showed large flexibility in grazing management, which allowed it to be maintained at sward heights between 15 and 35 cm.

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Section: Variablesmentioning

confidence: 52%

Section: Variablesmentioning

confidence: 95%

Tillering and forage accumulation in Marandu grass under different grazing intensities

Calvano

Euclides²,

Montagner³

et al. 2011

Rev. Ceres

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show abstract

“…A altura da planta foi monitorada semanalmente com auxílio de uma régua graduada em centímetros, e uma folha de transparência (filme de acetato), posicionada sobre o dossel, medindose a altura do solo até o ponto médio da transparência (SOUZA JÚNIOR, 2007;FAGUNDES et al, 1999). As medidas foram tomadas em seis posições da parcela escolhidas aleatoriamente.…”

Section: Methodsunclassified

Produtividade e qualidade da brachiaria irrigada no outono/inverno

et al. 2016

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RESUMO:Um dos fatores que determinam os baixos índices zootécnicos na pecuária brasileira é a estacionalidade da produção das plantas forrageiras tropicais. A irrigação pode proporcionar aumento e estabilização da produtividade durante o outono e o inverno. Objetivou-se pelo presente estudo avaliar: a) a produtividade de massa seca e qualidade de forragem de Brachiaria brizantha, em função de lâminas de irrigação, no período do outono e do inverno; b) a umidade do solo e a temperatura do ar a fim de determinar seus efeitos na produtividade de forragem. O experimento foi conduzido na Fazenda Experimental da FCAV-Unesp, em Jaboticabal-SP. Utilizou-se de um sistema de aspersão em linha para estabelecer tratamentos com cinco lâminas de irrigação correspondentes a frações da evapotranspiração de referência (L 1 = 0,18; L 2 = 0,52; L 3 = 1,00; L 4 = 1,45 e L 5 = 1,67), em duas estações do ano: outono e inverno. A produtividade de forragem foi mais elevada no outono, e a resposta de produtividade à lâmina de água foi ajustada por uma função quadrática, atingindo produtividades máximas com lâminas de 267 e 269 mm para o outono e o inverno, respectivamente. Alto valor nutritivo da forragem fo i obtido em ambas as estações do ano, com incrementos nos teores de proteína bruta com acréscimo da lâmina de irrigação somente no outono. As lâminas de água não afetaram os teores de fibra detergente neutro da forragem. PALAVRAS-CHAVE: Brachiaria brizantha, forragem, irrigação. HERBAGE YIELD AND QUALITY OF IRRIGATED BRACHIARIA IN AUTUMN AND WINTER ABSTRACT:One of the reasons of low performance of the Brazilian livestock industry include the seasonal growth of tropical pasture grasses. Irrigated grasslands may have higher and most stable rates of yield during autumn and winter seasons. Therefore, we aimed at evaluating: a) Brachiaria brizantha dry matter yield and forage quality as a function of different water depths during the autumn and winter, and b) soil moisture and air temperature effects on forage yield. The experiment was carried out at the Experimental Farm of the University of São Paulo State (FCAV -UNESP), campus in Jaboticabal -SP, Brazil. We used a line-source sprinkler system to provide five levels of irrigation (L 1 = 0.18, L 2 = 0.52, L 3 = 1.00, L 4 = 1.45, and L 5 = 1.67). These water depths corresponded to fractions of reference evapotranspiration in both autumn and winter. Forage yield was higher in autumn and water depth responses were fitted by a quadratic function, reaching maximum values at 267 and 269 mm during autumn and winter, respectively. During the autumn, we observed a highly nutritive forage with crude protein increment by increasing water depths. However, water application had no effect on neutral detergent fiber content.

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“…O manejo do pastejo deve ser encarado como a maneira mais efetiva de se criar e manipular estruturas de pasto com o objetivo de otimizar os processos de crescimento da planta forrageira e de busca e apreensão de forragem pelo animal em pastejo (CARVALHO et al, 2001). Para tanto, deve ser baseado no entendimento das respostas de cada espécie forrageira a diferentes regimes de pastejo com o intuito de alcançar objetivos sustentáveis de produção e conservação.…”

Section: O Manejo Do Pastejounclassified

Demografia do perfilhamento e produção de forragem em pastos de capim-marandu submetidos a regimes de lotação intermitente por bovinos de corte

Giacomini¹

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Índice de área foliar, interceptação luminosa e acúmulo de forragem em pastagens de Cynodon spp. sob diferentes intensidades de pastejo

Cited by 54 publications

References 8 publications

Tillering and forage accumulation in Marandu grass under different grazing intensities

Tillering and forage accumulation in Marandu grass under different grazing intensities

Produtividade e qualidade da brachiaria irrigada no outono/inverno

Demografia do perfilhamento e produção de forragem em pastos de capim-marandu submetidos a regimes de lotação intermitente por bovinos de corte

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