Características produtivas e qualitativas do capim-elefante pastejado em intervalo fixo ou variável de acordo com a interceptação da radiação fotossinteticamente ativa

Voltolini, Tadeu Vinhas; Santos, Flávio Augusto Portela; Martinez, Júnio César; Clarindo, Rafael Luis; Penati, Marco Antonio; Imaizumi, Hugo

doi:10.1590/s1516-35982010000500009

Cited by 32 publications

(39 citation statements)

References 13 publications

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“…The average light interception value for the LI95 treatment is quite close to that of the predetermined one, and for the RP30 treatment, the value was within a range considered close to the maximum light interception because light interception values that are greater than 98% are rarely found in the literature (Carnevali;Oliveira, 2006;Pedreira;Pedreira;Silva, 2007;Voltolini et al 2010).…”

Section: Resultssupporting

confidence: 67%

“…A reduction in the rest period for tropical pastures during the growing season has been identified as a way to control the canopy structure Nascimento Júnior, 2007) and increase the forage utilization efficiency (Da Silva, 2013). For Napier elephant grass, Voltolini et al (2010) observed rest periods of 19.4 days under 95% LI, with an average residual height of 62 cm. When evaluating the Xaraés palisade grass with 16.2 cm for the average residual height, Pedreira, Pedreira and Silva (2007) found 22 days on average for the rest periods during the spring/ summer period.…”

Section: Resultsmentioning

confidence: 92%

“…The rotational stocking method has come into wide use, especially in dairy farming, but the use of a fixed rest period has been inefficient in terms of the control of canopy features (Pedreira;Pedreira;Silva, 2007;Voltolini et al, 2010). The primary grazing management strategy that is used to control the structural characteristics of forage swards is the interception of light as a reference to monitor the regrowth process, which allows for forage harvests under the same physiological conditions (Euclides et al, 2014;Pedreira;Pedreira;Da Silva, 2007).…”

Section: Introductionmentioning

confidence: 99%

“…Studies to evaluate the influence of the resting period when using 95% light interception (LI) have been recently conducted (Difante et al, 2009;Giacomini et al, 2009;Trindade et al, 2007). However, only the works of Pedreira, Pedreira, and Silva (2007) and Voltolini et al (2010) aimed to compare the rotational stocking method while using a fixed defoliation frequency and a variable frequency based on 95% LI in Xaraés (Brachiaria brizantha cv. Xaraés) and elephant grass (Pennisetum purpureum Schum) pastures, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Forage mass and morphological composition of Marandu palisade grass pasture under rest periods

et al. 2016

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An evaluation of productive potential is not the only factor used to determine grazing management efficiency; it is also necessary to know the structural characteristics of the canopy. The objective of this study was to evaluate the effects of two management styles on Marandu palisade grass pastures under rotational stocking with respect to the herbage mass, morphological composition, and structural characteristics of the pasture. The treatments under consideration were a) a fixed rest period of 30 days (RP30) or b) a rest period based on the time necessary for the canopy to reach 95% light interception (LI95). The experimental design was a completely randomized block with two blocks and three replicates within the blocks. Animals were placed in the paddocks when the grass reached the established management criteria, which were maintained for three days to reach 25 cm in stubble height. Shorter grazing intervals (22.8 vs. 30 days), lower pre-grazing heights (35.9 vs. 42.3 cm), and lower forage masses (4,411 vs. 5,290 kg/ha.cycle) were observed in LI95 pastures. The LI95 treatment had a higher leaf percentage (48.3 vs. 41.1) and the lowest percentage of dead forage (19.0 vs. 25.4) in the pre-grazing forage mass of the pasture in relation to that of RP30. Performing pasture management based on RP30 throughout the season is harmful to the pasture structure because it reduces the leaf percentage and increases the stem and senescent material in the available forage. The lower pre-grazing forage mass observed under LI95 management is offset by more grazing cycles within the rainy season.Index terms: Pre-grazing height; Grazing cycle; interception of photosynthetically active radiation; leaf mass. RESUMOA avaliação do potencial produtivo do pasto não é o único fator que pode ser usado para determinar a eficiência de manejo do pastejo, também é necessário considerar as características estruturais do dossel. Neste estudo, objetivou-se avaliar a influência de dois critérios para definição do período de descanso do pasto de capim-marandu sobre a massa de forragem, a composição morfológica e as características estruturais do pasto durante a estação chuvosa. Os períodos de descanso estudados foram: fixo de 30 dias (PD30) e variável, conforme a interceptação de 95% da radiação fotossinteticamente ativa (IL95). O delineamento experimental utilizado foi em blocos inteiramente casualizados, com duas repetições de área e três repetições dentro de bloco. Os animais (vacas mestiças) foram colocados nos piquetes, logo que os pastos atingiam os critérios de manejo estabelecidos e permaneciam dentro dos mesmos durante três dias, de forma a atingir a altura de resíduo de 20-25 cm. Menor intervalo entre pastejo (22,8 vs. 30 dias), menor altura pré-pastejo (35,9 vs. 42,3 cm) e menor massa de forragem verde (4.411 vs. 5.290 kg/ha.ciclo) foram observados no pasto sob IL95. Contudo, o pasto sob IL95 apresentou maior percentual de lâmina foliar (48,3 vs. 41,1) e menor percentual de material morto (19,0 vs. 25,4) na massa de forragem ...

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Section: Resultssupporting

confidence: 67%

Section: Resultsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Forage mass and morphological composition of Marandu palisade grass pasture under rest periods

et al. 2016

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“…Regarding its management, recent studies that used the critical leaf area index (LAI) as the maximum threshold for interruption of regrowth suggested that the leaf production is optimal at heights of approximately 85cm for the 'Napier' (PEREIRA et al, 2014) and 100cm for the 'Cameroon' (VOLTOLINI et al, 2010) cultivars, respectively.…”

Section: Introductionmentioning

confidence: 99%

Levels of defoliation and regrowth dynamics in elephant grass swards

et al. 2015

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Nutritive value and morphological characteristics of Mombaça grass managed with different rotational grazing strategies

et al. 2019

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Light competition increases and plants’ growth pattern change to optimize light utilization when the leaf area index increases. It has been previously shown that using 95% canopy light interception (LI) as a grazing frequency criterion resulted in a greater proportion of leaves and a lower proportion of stem. The objective of the study was to characterize the forage production, morphological composition and nutritive value of Panicum maximum cv Mombaça. The experiment was carried out during summer, autumn–winter and spring. Treatments corresponded to combinations of two pre-grazing conditions (95% and maximum LI at pre-grazing; LI95% and LIMax, respectively) and two post-grazing heights (PGHs; 30 and 50 cm). The statistical design was a randomized complete block, with a 2 × 2 factorial arrangement. Swards managed with LI95% had greater proportions of leaves and lower proportions of stems compared to LIMax. Leaf proportion was lower during autumn–winter compared to summer and spring. The LI95% had greater crude protein (CP) and digestibility (IVOMD), and lower acid detergent fibre (ADF) concentrations than LIMax. The 50 cm PGH pastures had greater CP content and IVOMD, and lower ADF content than 30 cm PGH pastures. Lower IVOMD was observed during autumn–winter than summer and spring. The variability observed on morphological characteristics was primarily associated with seasonality, whilst the nutritive value was primarily affected by grazing management. The pre-grazing target of LI95% combined with 50 cm PGH was the combination that resulted in an increased proportion of leaves, decreased stems in basal stratum and the greatest nutritive value of the produced forage.

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Características produtivas e qualitativas do capim-elefante pastejado em intervalo fixo ou variável de acordo com a interceptação da radiação fotossinteticamente ativa

Cited by 32 publications

References 13 publications

Forage mass and morphological composition of Marandu palisade grass pasture under rest periods

Forage mass and morphological composition of Marandu palisade grass pasture under rest periods

Levels of defoliation and regrowth dynamics in elephant grass swards

Nutritive value and morphological characteristics of Mombaça grass managed with different rotational grazing strategies

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