Tissue flow and biomass production of piatã grass in function of defoliation frequency and nitrogen fertilization

Morais, Maria da Graça; Paiva, Luísa Melville; Menezes, Bruna Biava de; Fernandes, Patrick Bezerra; Campos, Nathália Rafaela Fidelis; Barbosa, Rodrigo Amorim; Bento, Anderson Luiz de Lucca; Rocha, Raizza Fátima Abadía Tulux

doi:10.5747/ca.2019.v15.n2.a288ca

Cited by 9 publications

(2 citation statements)

References 13 publications

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“…A possible alternative management strategy is the use of moderate doses of N (e.g., 100 to 200 kg of N ha -1 ). By adopting this fertilization strategy in tropical climate pastures, it is possible to achieve a balance in the leaf area dynamics, thus maximizing the production of forage biomass, as recorded by Menezes et al (2019) and Oliveira-Neto et al (2020) in areas managed under lenient defoliation. Therefore, the tested hypothesis was whether moderate doses of ammonium sulfate promote positive effects on the biomass and deposition of CP in BRS Tamani grass.…”

Section: Journal Of Agricultural Studiesmentioning

confidence: 99%

Ammonium sulfate rates affect the Structural Characteristics, Biomass and Crude Protein of BRS Tamani Grass

Abreu

Golin

Rezende

et al. 2020

JAS

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The mineral nutrition of forage species is essential for the maintenance of sustainable livestock systems, since it can increase animal productivity per area. Panicum maximum is considered nutritionally demanding. However, the behavior of modern cultivars under nitrogen fertilization is unknown. The objective of this study was to evaluate the effects of increasing doses of nitrogen (N) on the structural characteristics, forage biomass, and crude protein (CP) of cultivar BRS Tamani. The experimental design was randomized blocks, and the treatments consisted of six N doses (0, 62.5, 125, 250, 375, and 500 N mg∙dm-3) using ammonium sulfate (AS) fertilizer, divided into three coverage applications under greenhouse conditions. Three cuts were made from all treatments, separated by an interval of 30 days. The interval between cuts was considered a split-plot effect. There was no interaction effect between the cuts and AS doses for the number of leaves tiller-1 or crude protein. However, there was an interaction effect for the leaf length, number of tillers, and biomass. The use of doses between 280 and 380 mg N∙dm-³ influenced the structural characteristics of the canopy and biomass of 'BRS Tamani' grass. The highest CP value was recorded in the first cut.

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Section: Journal Of Agricultural Studiesmentioning

confidence: 99%

Ammonium sulfate rates affect the Structural Characteristics, Biomass and Crude Protein of BRS Tamani Grass

Abreu

Golin

Rezende

et al. 2020

JAS

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“…The grazing intensity may be one of the ways to control the possible effects of the mixed architecture of the forage canopy, considering that the pasture height management is decisive on the morphological charac-teristics of the tiller (Montagner et al, 2012;Menezes et al, 2019). Therefore, it can also determine the possible preference or promote the absence of selectivity in the intercropping of tropical climate grasses.…”

Section: Introductionmentioning

confidence: 99%

Defoliation Dynamics on Grazing Horizons in Pastures Intercropped by Panicum maximum, Brachiaria brizantha, and Brachiaria decumbens

Fernandes

Barbosa

Morais

et al. 2020

Trop. Anim. Sci. J.

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The aim of this study was to quantify and verify the defoliation dynamics process of the Panicum maximum, Brachiaria brizantha, and Brachiaria decumbens intercropping during the formation of four grazing horizons in lenient grazing intensities and high grazing intensity. Pastures were managed in a pregrazing height of 70 cm, and as post-grazing height, the criteria of 40% and 60% were used in relation to the pre-grazing height. The experimental design used was a completely randomized design with a 3x4 factorial arrangement. The first factor was the cultivars of intercropped grasses consisted of 3 cultivars, i.e., BRS Zuri, Xaraés, and Basilisk. The second factor was grazing horizons consisted of 4 levels, i.e., I: one; II: two; III: three; IV: four. In the intercropping managed with 40% of the forage canopy height removal, oscillations were observed in the severity of defoliation of the extended tiller among the intercropped species, in which the tiller reduction of the 'Basilisk' was 32% lower in relation to 'BRS Zuri'. In the intercropping managed with 60% of the forage canopy height removal intensity, disproportionality was observed among the grasses, because the 'Basilisk' suffered a higher severity and frequency of pseudostem defoliation. In intercropped pastures managed under grazing intensities of 40%, as the animal explores the grazing horizons, the vertical distribution of the pseudostem could modify the shape and positioning of the depth of the bite, leading the animal to perform less selective grazing among the species. Due to the higher supply of pseudostem mass at the intensity of 60%, it was possible to infer that there was a reduction in forage intake.

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Leaves per tiller as the criterion to determine optimum defoliation frequency in pastures of Brachiaria decumbens

Luna

Fornaguera

2020

Rev. Fac. Nac. Agron. Medellín

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Two studies were performed to establish the best defoliation frequency in Brachiaria decumbens using the number of leaves per tiller as a criterion. In the first study, 3,500 tillers with 2, 3, 4, 5, or 6 leaves were collected in 10 farms. The number of green, senescent, and dead leaves was counted. A pooled sample of tillers by each farm with a given number of leaves was analyzed for nutritional quality; a complete randomized block design was used for this study. In a second study, it was implemented a complete ramdomized design with repeated measures over time (2 defoliations), and the effect of defoliating B. decumbens at 3, 4, or 5 leaves per tiller on its growth, dry matter yield, and nutritional quality were evaluated. In the first study, all leaves remained green until the tiller had 3 leaves. At the fourth leaf, few tillers (2.3%) had senescent leaves, but at 6 leaves, most tillers had senescent (40.6%) or dead (24.4%) leaves. Crude protein and digestibility decreased as the number of leaves in a tiller increased (P<0.001). In the second study, the rate of dry matter accumulation was the highest for plots defoliated at 4 leaves (P<0.05). Green stems (43.9%) represented a larger proportion of dry matter than green leaves (31.4%), and their proportions were similar among treatments. Crude protein and digestibility of stems decreased as the number of leaves per tiller increased (P<0.001), but the quality of leaves was similar. These findings suggest that these pastures should be defoliated at 4 leaves per tiller.

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Tissue flow and biomass production of piatã grass in function of defoliation frequency and nitrogen fertilization

Cited by 9 publications

References 13 publications

Ammonium sulfate rates affect the Structural Characteristics, Biomass and Crude Protein of BRS Tamani Grass

Ammonium sulfate rates affect the Structural Characteristics, Biomass and Crude Protein of BRS Tamani Grass

Defoliation Dynamics on Grazing Horizons in Pastures Intercropped by Panicum maximum, Brachiaria brizantha, and Brachiaria decumbens

Leaves per tiller as the criterion to determine optimum defoliation frequency in pastures of Brachiaria decumbens

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