A simple method for measuring tiller volume of grasses

Sbrissia, André Fischer; Silva, Sila Carneiro da; Molan, Leonardo Kehdi; Sarmento, D. O. L.; Andrade, F.M.E. de; Lupinacci, A. V.; Gonçalves, A. C.

doi:10.1111/j.1365-2494.2004.00433.x

Cited by 5 publications

(10 citation statements)

References 8 publications

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“…After tillers had been separated into basal and aerial, the morphological components of tillers (leaf (leaf laminae), stem (stem + leaf sheath) and dead material) were hand dissected, weighed separately to determine their fresh weight, and leaf lamina measured using a leaf area integrator LI 3100 (LI-COR, Lincoln, Nebraska, USA) for determining the mean leaf area per tiller. The volume of individual tiller components was then determined using equipment based on the communicant pipe principle (Sbrissia et al, 2004), and components placed into paper bags, dried in forced draught oven at 65 o C for 48 hours and weighed. Both the fresh and dry weight of leaves for individual tillers in each category (basal and aerial) were presented as arithmetic means.…”

Section: Introductionmentioning

confidence: 99%

Components of the leaf area index of marandu palisadegrass swards subjected to strategies of intermittent stocking

Giacomini

Silva

Sarmento

et al. 2009

Sci. agric. (Piracicaba, Braz.)

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Leaf area index is the main sward characteristic related to the processes of light interception and competition in plant communities. The objective of this experiment was to quantify and evaluate the composition of the leaf area on tillers of marandu palisadegrass (Brachiaria brizantha cv. Marandu) subjected to strategies of intermittent stocking. The experiment was carried out in Piracicaba, state of São Paulo, Brazil, from October/2004 to December/2005. Swards were grazed at 95 and 100% canopy light interception (LI) to post-grazing heights of 10 and 15 cm, following a 2 2 factorial arrangement with four replications in a randomised complete block design. Estimates were made of sward leaf area index, site filling, specific leaf area and the dimensionless ratio between tiller leaf area and volume (R), as well as the relative contribution of basal and aerial tillers to these variables. In early spring, values of leaf area index and specific leaf area were low when compared to the other seasons, and swards grazed at 95% LI presented higher site filling and specific leaf area than those grazed at 100% LI. This resulted in higher tillering activity and increase in leaf area index in late spring, indicating quick recovery and early return of swards grazed at 95% LI to growing conditions. Aerial tillers corresponded to an important morphological adaptation of marandu palisadegrass to increase its competitive ability. Treatment 100/10 resulted in the highest and 95/15 in the lowest R values throughout the experiment, suggesting an allometric pattern of growth of tillers during regrowth in order to compensate low tiller population and optimise the leaf area index. Grazing management practices can benefit from this knowledge by promoting ideal sward conditions to maximise and accelerate growth. (Trindade, 2007). The objective was to evaluate the effect of pre-grazing sward light interception (LI) and post-grazing height targets on leaf area formation (including the separate contribution of basal and aerial tillers) of intermittently stocked marandu palisadegrass swards.

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Section: Introductionmentioning

confidence: 99%

Components of the leaf area index of marandu palisadegrass swards subjected to strategies of intermittent stocking

Giacomini

Silva

Sarmento

et al. 2009

Sci. agric. (Piracicaba, Braz.)

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“…Essa seria a condição na qual o IAF do dossel corresponderia ao IAF crítico (PARSONS et al, 1983), valor esse que possui relação direta com variáveis como o acúmulo de forragem, especialmente de folhas, composição morfológica e eficiência de utilização da forragem produzida. Em plantas forrageiras de clima tropical, em que a fração colmo representa porção significativa do crescimento das plantas (DA SILVA, 2004), o acúmulo de colmo e de material morto só começa a ser incrementado de maneira significativa a partir da condição em que o dossel intercepta 95% da luz incidente, ou seja, atinge seu IAF crítico (DA SILVA; NASCIMENTO JR., 2006). Vários trabalhos realizados recentemente com os capins xaraés (PEDREIRA, 2006), mombaça (CARNEVALLI, 2003;MONTAGNER, 2007), tanzânia (BARBOSA, 2004;DIFANTE, 2005;ZANINE, 2007), tobiatã, massai, atlas (MORENO, 2004 e cameroon (VOLTOLINI, 2006) demonstraram que o uso do critério para interrupção da rebrotação quando 95% da luz incidente são interceptados também é válido para gramíneas tropicais, pois corresponde à condição em que maior taxa de acúmulo de folhas é obtida.…”

Section: O Manejo Do Pastejounclassified

“…As práticas de manejo adotadas alteram de forma marcante e diferenciada cada espécie forrageira e plantas individuais, afetando dessa maneira a população de plantas na área e a capacidade produtiva do pasto (DA SILVA, 2004; DA SILVA; NASCIMENTO JR., 2006).…”

Section: O Manejo Do Pastejounclassified

“…Dessa maneira, a manipulação da dinâmica do perfilhamento deve ser um dos objetivos do manejo do pastejo, principalmente em situações onde a densidade populacional tende para um mínimo necessário para garantir a perenização da pastagem (LEMAIRE; . Aplicações e conhecimento dessa natureza existem para gramíneas de clima temperado, porém, para gramíneas de clima tropical, esse conhecimento é escasso e, quando disponível, possui restrições na forma segundo a qual foi gerado, conseqüência da limitação dos protocolos experimentais utilizados (DA SILVA, 2004). Esse fato sugere a importância e o potencial que estudos dessa natureza têm para a melhoria e ajustes finos das atuais práticas de manejo utilizadas para gramíneas tropicais, especialmente para o capimmarandu, dada sua importância e representatividade nas áreas de pastagens plantadas no Brasil.…”

Section: O Manejo Do Pastejounclassified

“…Além disso, como havia maior área foliar residual , a planta pôde investir mais em perfilhamento em uma época em que as gerações que sobreviveram durante todo o inverno estavam desaparecendo. Esse fato é determinante e sugestivo de uma menor longevidade e maior renovação de perfilhos, promovendo um padrão mais jovem da indicam redução da população de perfilhos com aumento na altura do dossel (BARBOSA, 2004;BIRCHAM;HODGSON, 1983;MATTHEW et al, 1995;SBRISSIA, 2004 …”

Section: Perfilhamentounclassified

See 2 more Smart Citations

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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Size/density compensation in Chloris gayana Kunth cv. Fine Cut subjected to different defoliation regimes

Calsina¹,

Agnusdei²,

Assuero

et al. 2012

Grass and Forage Science

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The study evaluated the plasticity of Chloris gayana Kunth cv. Fine Cut to defoliation in terms of tiller size ⁄ density compensation (SDC). Twelve mini-swards were grown in a greenhouse under non-limiting water and nutrient availabilities for 188 d. Four defoliation treatments were applied as a factorial arrangement of two defoliation frequencies and intensities: 80L, 80H, 100L and 100H (80 and 100 denote percentage of photosynthetically active radiation intercepted at defoliation; L and H denote stubble LAIs of 0AE6 and 1AE75, respectively). Tiller density, demography, dry weight, leaf area and volume were determined over the final 77 d of the experiment. SDC was observed across 80H and both 100 treatments. The estimated slope of the relationship between tiller size and density was close to )5 ⁄ 2, the deviation from the )3 ⁄ 2 line proposed for undefoliated swards being related to changes in LAI and tiller leaf area ⁄ volume ratio. The most severe defoliation regime, 80L, resulted in a lower tiller population density relative to the compensation line, suggesting that this defoliation management shifted the species beyond its range of phenotypic plasticity. Cumulative herbage production was significantly reduced in 80L. Despite the similar herbage production of 80H and both 100 treatments, the former was the most favourable defoliation regime for optimizing leafiness and productivity.

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A simple method for measuring tiller volume of grasses

Cited by 5 publications

References 8 publications

Components of the leaf area index of marandu palisadegrass swards subjected to strategies of intermittent stocking

Components of the leaf area index of marandu palisadegrass swards subjected to strategies of intermittent stocking

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

Size/density compensation in Chloris gayana Kunth cv. Fine Cut subjected to different defoliation regimes

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