Tillering dynamics in pastures of guinea grass subjected to grazing severities under intermittent stocking

Montagner, Denise Baptaglin; Júnior, Domicio do Nascimento; Vilela, Hélio Henrique; Sousa, Bráulio Maia de Lana; Euclides, Valéria Pacheco Batista; Silva, Sila Carneiro da; Carloto, Marciele Neves

doi:10.1590/s1516-35982012000300010

Cited by 22 publications

(21 citation statements)

References 16 publications

(17 reference statements)

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“…As defoliation frequencies decreased, so did tiller appearance and mortality rates (Figure 3 A and C). This response pattern has also been recorded for various forage grasses, such as Marandu (Difante et al, 2008), Brachiaria (Santana et al, 2014), Mombaça (Montagner et al, 2012), and Tanzania (Zanine et al, 2013), among others. However, in the period of lower insolation, appearance and mortality rates were higher (Figure 3 B and D).…”

Section: Resultssupporting

confidence: 56%

Tillering dynamics of digit grass subjected to different defoliation frequencies

Sousa

Rizato

Fagundes

et al. 2019

Pesq. agropec. bras.

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The objective of this work was to evaluate the tillering dynamics of 'Suvernola' digit grass (Digitaria eriantha) when subjected to different defoliation frequencies. Four defoliation frequencies (interval among harvests) were evaluated -very high, when the grass reached 25 cm in height; high, 35 cm; medium, 45 cm; and low, 55 cm -in two seasons of the year, with higher and lower insolation, A randomized complete block design with four replicates was used. The increase in defoliation frequency increased the number of generations and the appearance, mortality, and density rates of tillers, besides decreasing their survival rate, without changing population stability. At the time of lower insolation, tiller appearance and mortality rates were higher, while tiller survival rate, balance, and density were lower. The evaluated defoliation frequencies and seasons of the year do not change the persistence of digit grass when irrigated. Higher defoliation frequencies result in a greater renewal of digit grass tillers.Index terms: Digitaria eriantha, harvest height, pasture persistence. B.M. de L. Sousa et al.

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Section: Resultssupporting

confidence: 56%

Tillering dynamics of digit grass subjected to different defoliation frequencies

Sousa

Rizato

Fagundes

et al. 2019

Pesq. agropec. bras.

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“…Leaf lifespan (54.18 ± 5.06 days), phyllochron (17.40 ± 1.34 days/leaf) and leaf senescence rate (0.87 ± 0.15 cm/tiller.day -1 ) were not significantly different among Panicum maximum cultivars during the establishment period. These characteristics are mainly regulated by environmental conditions such as light, water availability, temperature and soil fertility (Montagner et al, 2012b;Martuscello et al, 2015).…”

Section: Resultsmentioning

confidence: 99%

Morphogenic and structural characteristics of Panicum cultivars during the establishment period in the Brazilian Northeast

Costa

Difante

Gurgel

et al. 2020

Acta Sci. Anim. Sci.

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This study aimed to evaluate the morphogenic and structural characteristics of six Panicum maximum cultivars during the establishment period. A completely randomized block design with four replicates and six treatments (Tamani, Mombaça, Massai, Tanzania, Aruana and Zuri cultivars) was used. Morphogenic (leaf appearance rate, leaf elongation rate e stem elongation rate), structural (final leaf length, tiller population density e number of leaves per tiller) and productive (forage mass, leaf blade mass, stem mass, senescent material mass and leaf:stem ratio) characteristics were evaluated. There was no difference (p > 0.05) between the cultivars in terms of the number of live leaves per tiller (2.95 leaves/tiller). Mombaça cultivar had (p < 0.05) higher canopy height (50.64 cm) compared with other cultivars. The highest (p < 0.05) tiller population density was observed in Tamani (235.90 tillers m-2) and Massai (201.60 tillers m-2) cultivars. Leaf lifespan (54.18 days), phyllochron (17.40 days/leaf) and leaf senescence rate (0.87 cm tiller day-1) were not different (p > 0.05) between cultivars. However, leaf appearance rate was higher (p < 0.05) in Tanzania (0.07 leaves tiller day-1) than in Aruana cultivar (0.05 leaves tiller day-1). Leaf blade mass was higher (p < 0.05) in Mombaça cultivar (1518.31 kg DM ha-1), whereas Massai showed higher (p < 0.05) leaf:stem ratio (9.25). Panicum cultivars Tamani, Tanzania and Massai establishment after 75 days, while the other cultivars establish at 105 days of sowing in the Brazilian Northeast.

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“…Excetuando-se o Final da Primavera e Verão 2, observou-se que a alta mortalidade esteve associada ao elevado aparecimento de perfilhos (Tab. 1), um processo comum em épocas com clima mais favorável ao crescimento da planta forrageira (Carvalho et al, 2000;Montagner et al, 2012;Morais et al, 2006;Santos et al, 2011). A menor mortalidade de perfilhos e, com efeito, sua maior sobrevivência, em épocas com clima desfavorável ao crescimento, consiste em mecanismo adaptativo para compensar o menor aparecimento de perfilhos (Santos et al, 2011), contribuindo para manter mais estável a população de perfilhos e garantir a perenidade da gramínea.…”

Section: Resultsunclassified

“…A menor mortalidade de perfilhos e, com efeito, sua maior sobrevivência, em épocas com clima desfavorável ao crescimento, consiste em mecanismo adaptativo para compensar o menor aparecimento de perfilhos (Santos et al, 2011), contribuindo para manter mais estável a população de perfilhos e garantir a perenidade da gramínea. Montagner et al (2012), quando trabalharam com Panicum maximum cv. Mombaça submetido à lotação intermitente e altura pós-pastejo variável ao longo do ano, também observaram a TMoP sendo menor no inverno e maior na primavera e verão, mesmo resultado para a TApP, o que demonstra a relação entre essas variáveis para manter a estabilidade do pasto.…”

Section: Resultsunclassified

Perfilhamento do capim-piatã submetido a regimes de desfolhação intermitente

Rocha

Chizzotti

Santos

et al. 2019

Arq. Bras. Med. Vet. Zootec.

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RESUMOObjetivou-se avaliar o perfilhamento da Brachiaria brizantha cv. Piatã, como base para identificação das frequências e alturas pós-corte mais adequadas para essa gramínea forrageira. Em um esquema fatorial 2 x 2, foram estudadas combinações entre duas frequências de corte (95% e máxima interceptação de luz, IL max ) e duas alturas pós-corte (15 e 20cm). O delineamento foi em blocos ao acaso, com três repetições, totalizando 12 unidades experimentais de 14m 2 cada. Foram avaliadas as taxas de aparecimento (TApP) e de mortalidade (TMoP) de perfilhos, o índice de estabilidade (IE) e a densidade populacional de perfilhos. A maior TApP no dossel sob IL de 95% ocorreu no Verão 1, em comparação às demais épocas. Nos dosséis manejados com IL max , a TApP foi superior no Verão 1 e no Outono, quando comparados às outras épocas. No Verão 1 e no Final da Primavera e Verão 2, houve as maiores TMoP para as duas frequências de corte avaliadas. No Outono, a TMoP também foi alta no dossel cortado com IL máx . O IE foi menor durante o Verão 1 no dossel sob IL max e com 15cm de resíduo (0,995). Porém, nas demais épocas, os valores de índice de estabilidade foram maiores que uma unidade e não foram influenciados pela frequência e altura pós-corte. A densidade populacional de perfilhos foi menor no Verão 1, em comparação às demais épocas. O capim-piatã pode ser desfolhado com qualquer combinação entre as interceptações de luz, 95% e IL max , e alturas pós-corte, 15 ou 20cm, sem prejudicar a persistência do pasto.Palavras-chave: aparecimento de perfilho, interceptação de luz, índice de estabilidade, mortalidade de perfilho ABSTRACTThe aim of this study was to evaluate the tillering of Brachiaria brizantha cv. Piatã, as a basis for identifying the frequencies and post-cutting heights most suitable for this grass. In a 2 x 2 factorial scheme, combinations between two cut frequencies (95% and maximum light interception, IL max ) and two post-cut heights (15 and 20cm) were studied. The experimental design was in randomized blocks with 3 replicates, totaling 12 experimental units of 14m 2 each. Rates of appearance (TAR) and mortality (TMR) of tillers, the stability index and the population density of tillers were evaluated. The highest TAR in the canopy under 95% IL occurred in Summer 1, in comparison to the other seasons. In the canopies managed with IL max , TAR was higher in summer 1 and in autumn, when compared to other seasons. In summer 1 and at the end of spring and summer 2, there were the highest TMR for the two cutoff frequencies evaluated. In autumn, TMR was also high in the canopy cut with IL max . IE was lower during summer 1 in the canopy under IL max and 15cm of residue (0.995). However, at other times, stability index values were greater than one unit and were not influenced by post-cut frequency and height. The population density of tillers was lower in Summer 1, when compared to the other seasons. The piata grass may be defoliated with any combination of light intercepts, 95% and ILmax, 15 or 20cm, without impairi...

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Tillering dynamics in pastures of guinea grass subjected to grazing severities under intermittent stocking

Abstract: which may be important to maximize the use of the forage species in the production system.

Cited by 22 publications

References 16 publications

Tillering dynamics of digit grass subjected to different defoliation frequencies

Tillering dynamics of digit grass subjected to different defoliation frequencies

Morphogenic and structural characteristics of Panicum cultivars during the establishment period in the Brazilian Northeast

Perfilhamento do capim-piatã submetido a regimes de desfolhação intermitente

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