Acúmulo de massa seca em cultivares de Brachiaria brizantha submetida a intensidades de desfolhação

Fontes, João Guilherme de Góis; Fagundes, Jaílson Lara; Backes, Alfredo Acosta; Barbosa, Leandro Teixeira; Cerqueira, Elder Sânzio Aguiar; Silva, Laerte Marques da; Morais, Juciléia Aparecida da Silva; Vieira, Jodnes Sobreira

doi:10.5433/1679-0359.2014v35n3p1425

Cited by 19 publications

(16 citation statements)

References 15 publications

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“…Pasture management needs to be oriented towards factors related to plant, animal, and forage quantity and quality (LIMA et al, 2014). Grass height control is part of such management and influences forage structure and quality due to changes in fiber quantity, which affects food intake dynamics and animal performance (FONTES et al, 2014;VAN SOEST, 1994).…”

Section: Introductionmentioning

confidence: 99%

Short-term evaluation of Massai grass forage yield and agronomic characteristics and sheep performance under rotational grazing with different pre-grazing canopy heights

Cardoso

Sousa

Ferreira

et al. 2019

SCA

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This study aimed to evaluate the morphogenic, structural, chemical characteristics, and forage yield of Massai grass, as well as the performance of sheep under three pre-grazing canopy heights. Eighteen Dorper x crossbred sheep (12 males and 6 females) were subjected to three pre-grazing canopy heights of Massai grass (45, 35, and 25 cm). Rotational grazing was adopted, with a fixed rest period of 12 days and occupation of four days. Before placing animals in the paddock, stocking rate was estimated to ensure a reduction of about 50% in the initial height. Morphogenic and chemical characteristics of forage were evaluated, as well as animal intake and performance. Pasture managed at 25 cm height induced reductions in stem and sheath sizes, and phyllochron but an increased leaf: stem ratio. However, the pasture cut at 35 cm above ground promoted an increase in total dry mass and foliar leaf productions, in addition to greater forage availability and daily accumulation. Yet, pastures with a height of 45 cm had a higher percentage of stem and senescent material, decreasing leaf intake by animals. Among the studied heights, 35 cm is the most suitable for Massai grass, when used for rearing sheep for meat production under pasture conditions in the northern Tocantins. This is because this management provided a greater availability of good quality forage and thereby increasing weight gains per area in animals.

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Section: Introductionmentioning

confidence: 99%

Short-term evaluation of Massai grass forage yield and agronomic characteristics and sheep performance under rotational grazing with different pre-grazing canopy heights

Cardoso

Sousa

Ferreira

et al. 2019

SCA

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“…The proportion of SM exhibited quadratic behavior (P < 0.05) for RP 28days , with a minimum of 3.67% when 297.5 kg N ha -1 was applied (Figure 3f). Fontes et al (2014) reported that higher grazing intensities promoted an increase in the proportion of stems in the botanical composition of the pasture. The authors stated that this leads to lower forage density and a higher leaf:stem ratio at greater heights.…”

Section: Resultsmentioning

confidence: 99%

“…After fitting to the quadratic model, the period showed maximum forage density of 182.05 kg ha -1 cm -1 for 111.87 kg N ha -1 . Forage density determines intake rates in tropical pastures along with the leaf:stem ratio (FONTES et al, 2014). Costa et al (2010) stated that nitrogen fertilization is a management strategy that promotes an increase in forage density and leaf production, positively influencing DM production.…”

Section: Resultsmentioning

confidence: 99%

Productivity of Urochloa brizantha ‘Marandu’ influenced by strategic rest periods and nitrogen levels

Rodrigues

Santos

Junior

et al. 2017

SCA

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The effects of two strategic rest periods and associated nitrogen levels on the agronomic and productive characteristics of Urochloa brizantha 'Marandu' were evaluated. The trial was conducted in a completely randomized 4 × 2 split-plot design, with four blocks. The treatments consisted of associations between two rest periods and four nitrogen levels. The rest periods included one at the end of 28 days (RP 28days ) and another when the canopy height was 40 cm (RP 40cm ) and nitrogen levels of 0, 150, 300, and 450 kg N ha -1 year -1 was applied as ammonium sulfate. The following variables were evaluated: rest period (RP) per cycle, total dry matter (TDM), dry matter (kg ha -1 ) and proportion (%) of leaf blade (LB), stem, and senescent material (SM), tiller mass, forage density, leaf area index, height, leaf:stem ratio, and crop growth rate (CGR). The variables height, TDM, LB dry matter, stem dry matter, CGR, and forage density exhibited a linear relationship with RP 28days and a quadratic relationship with RP 40cm with increasing N levels. The proportions of LB and stem had linear relationships with N levels for RP 28days and RP 40cm . The leaf:stem ratio was affected by increasing N levels and it fit the quadratic model for both rest strategies. The SM proportion had a quadratic relationship only with RP 28days . The tiller mass had a linear relationship with RP 28days , whereas SM dry matter showed a linear relationship for RP 40cm . The use of the RP 40cm reduced the period needed to begin a new grazing cycle. The level of 450 kg N ha -1 is recommended for RP 28days and levels between 380 to 400 kg N ha -1 provided better results for RP 40cm .apresentaram comportamento linear para PD 28dias e quadrático para o PD 40cm com crescentes doses de N. As proporções de LF e colmo apresentaram comportamento linear com as doses de N para PD 28dias e PD 40cm . A relação folha:colmo apresentou efeito com as doses de N, se enquadrando no modelo quadrático para ambos as formas de período de descanso. A proporção de MM apresentou comportamento quadrático somente no PD 28dias . A massa por perfilho apresentou efeito linear para o PD 28dias , enquanto a massa seca de MM apresentou efeito linear para o PD 40cm . O uso do PD 40cm permitiu reduzir o tempo de espera para o aproveitamento da forragem nas parcelas. A dose de 450 kg de N ha -1 é recomendada para o PD 28dias e doses entre 380 a 400 kg de N ha -1 permitiram melhores resultados para PD 40cm . Palavras-chave: Frequência de pastejo. Intervalo de pastejo. Pastejo rotativo.

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“…It has horizontal, short, tough and curved rhizomes. It has deep roots, which help them to survive along dry periods (FONTES et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Sources and dosages of Nitrogen applied with urea coated with polymers in Marandu Palisade Grass

Carvalho¹,

Elias²,

Silva³

et al. 2018

R. Agrogeoambiental

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Nitrogen is one of the most important nutrients for the production of forage grasses, and the most expensive one. The scope of this research was to evaluate the application of four sources of urea (conventional and coated with polymers) under different dosages, in mass production and nitrogencontent and absorption from two cuts of Brachiaria brizantha cv. Marandu. The experiment was conducted at a greenhouse in a randomized block design. The fertilizers used were conventional urea, urea covered with a polymer layer, urea covered with sulfur and urea covered with a boron and copper compound. The dosages used were 30, 60, 90 and 120 kg ha-1 of nitrogen. Fresh and dry mass, root weight and nitrogen content from first and second harvest were evaluated. On the first harvest, there was no significant difference between the treatments for the variables analyzed. On the other hand, second harvest presented difference in fresh and dry mass and nitrogen content. Regression analyses showed a linear increase with all fertilizers used, but this growth was more accentuated for the polymerized fonts. All polymerized ureas allowed higher mass production for Marandu palisadegrass, at tillering and second cut. Foliar nitrogen availability of polymerized ureas did not differ from conventional urea, being recommended to reach pastures with higher quality and productions and to decrease nitrogen losses on the system.Keywords: Brachiaria brizantha. Stabilization technologies. Sulfur polymer.

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Acúmulo de massa seca em cultivares de Brachiaria brizantha submetida a intensidades de desfolhação

Cited by 19 publications

References 15 publications

Short-term evaluation of Massai grass forage yield and agronomic characteristics and sheep performance under rotational grazing with different pre-grazing canopy heights

Short-term evaluation of Massai grass forage yield and agronomic characteristics and sheep performance under rotational grazing with different pre-grazing canopy heights

Productivity of Urochloa brizantha ‘Marandu’ influenced by strategic rest periods and nitrogen levels

Sources and dosages of Nitrogen applied with urea coated with polymers in Marandu Palisade Grass

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