Produção animal em pastagem de capim-braquiária adubada com nitrogênio

Moreira, Luis; Santos, Manoel Eduardo Rozalino; Fonseca, Dilermando Miranda da; Martuscello, Janaína Azevedo; Morais, Rodrigo Vieira de; Mistura, Claúdio

doi:10.1590/s0102-09352011000400017

Cited by 12 publications

(11 citation statements)

References 12 publications

(9 reference statements)

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“…This occurred because cattle do not graze evenly. This variation was also observed by Moreira et al (2011) in B. decumbens pastures under continuous grazing. The management in continuous grazing allows for greater occurrence of uneven grazing as compared with rotational grazing (Barthram et al, 2005).…”

Section: Resultssupporting

confidence: 73%

“…(Embrapa, 1999) was used in the study. The brachiaria grass restored naturally in this area in 1997 and since then this pasture has been used for developing research projects with cattle, in which different management strategies were evaluated, such as nitrogen fertilization, from 2001 to 2003 (Moreira et al, 2011), pasture deferment in 2004(Santos, 2007 and average heights of pasture as a criterion for grazing management in continuous grazing in 2006and 2007(Faria, 2009). The pasture area was composed of eight paddocks, 0.25 to 0.40 ha, plus a reserve area, with a total of approximately 3.0 ha.…”

Section: Introductionmentioning

confidence: 99%

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Forage accumulation in brachiaria grass under continuous grazing with single or variable height during the seasons of the year

2013

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-The objective of this study was to evaluate grazing management strategies of Brachiaria decumbens cv. Basilisk managed with different heights under continuous grazing with cattle. Two grazing management strategies were evaluated: maintenance of pasture with an average height of 25 cm throughout the experimental period and maintenance of pasture on the average of 15 cm in height during winter, up to 25 cm from the beginning of spring. The split-plot scheme and the randomized block design with four replications were adopted. The grazing management strategies corresponded to the primary factor, while the seasons (winter, spring and summer) corresponded to secondary factor. The reduction of the average sward height to 15 cm in the winter resulted, when compared with pasture maintained at 25 cm, in overall higher growth rates (95 kg/ha.day DM) and leaf blade (66.1 kg/ha.day DM), as well as higher rates of total accumulation (81.5 kg/ha.day DM) and leaf blade (52.6 kg/ha.day DM). The accumulated forage production (from winter to summer) was higher in the pasture lowered to 15 cm in winter (25.6 t/ha DM) compared with that managed with an average height of 25 cm (22.2 t/ha DM). Regarding the seasons of the year, in the winter, there were lower rates of overall growth (6.4 kg/ha.day DM), leaf blade (5.6 kg/ha.day DM) and pseudostem (0.8 kg/ha.day DM), and also lower total (-6.6 kg/ha.day DM) and leaf blade (-7.5 kg/ha.day DM) accumulation rates. In the spring there was a higher rate of leaf senescence (22.4 kg/ha.day DM). The accumulation of forage is incremented when the pasture of B. decumbens is lowered to 15 cm during the winter, and in the spring and summer, its average height is increased to 25 cm.

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Section: Resultssupporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Forage accumulation in brachiaria grass under continuous grazing with single or variable height during the seasons of the year

2013

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“…Pasture is the main and most economical source of food in livestock (SKONIESKI et al, 2011). Brachiaria is a form used widely in Brazil, covering about 85% of those regions growing on low fertility soils, and being recommended for situations where extensive technological resources are lacking (MOREIRA et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Bayesian Modelling of the effects of nitrogen doses on the morphological characteristics of braquiaria grass

Ribeiro

Costa

Beijo

et al. 2018

AGRO@MBIENTE ON-LINE

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The Bayesian approach in regression models has shown good results in parameter estimations, where it can increase accuracy and precision. The objective of the current study was to analyze the application of Bayesian statistics to the modeling yield for leaf dry matter (LM) and stem (SM), in kg ha-1, leaf ratio (LR), crude protein content for leaves (CPL) and stem (CPS) (%) of Brachiaria grass as a function of varying N doses (0; 100; 200 and 300 kg ha-1 yr-1). Simple and two degree polynomial linear regression models were analyzed. Information for a priori distributions was obtained from the literature. A posteriori distribution was generated using a Monte Carlo method via Markov chains. Parameters significance was assyed with HPD (Highest Posteriori Density) with a 95% interval. Model selections was performed using DIC (Deviance Information Criterion); and adjustment quality estimated with means and 95% HPD for Bayesian R2 distribution ranges. The models selected for the variables LM, SM and CPS were linear, while for LR and CPL, they were second level polynomial. The lowest doses that maximize response variables were: LM: 274 ha-1yr-1, SM: 280 ha-1yr-1, LR: 113 ha-1yr-1, CPL: 265 ha-1yr-1, CPS: 289 ha-1yr-1. The Bayesian approach allowed the inclusion of literatureverified a priori information, and the identification of evidence optimization range intervals.

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“…The correct fertilization management in pasture soils aims to provide adequate nutritional support for forage plants, which reduces degradation processes and consequently the costs of recovering degraded areas. Thus, fertilization has a marked effect on pasture, which improves the gain per hectare (DELEVATTI et al, 2019) and, especially, its persistence, even for species adapted to low soil fertility (MOREIRA et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Nitrogen requirement of Brachiaria hybrid cv. Ipyporã

Cabral¹,

Cabral²,

Tesk³

et al. 2020

Bol. Ind. Anim.

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Resumo O capim Ipyporã, um híbrido interespecífico de Brachiaria, foi desenvolvido através do cruzamento de um genótipo de Brachiaria ruziziensis (sin. Urochloa ruziziensis) e um acesso de Brachiaria brizantha (sin. Urochloa brizantha), que possuem diferentes exigências de nitrogênio. O objetivo com este trabalho foi verificar a necessidade de nitrogênio do híbrido interespecífico de Brachiaria hibrida cv. Ipyporã. O experimento foi conduzido em casa de vegetação, em delineamento de blocos ao acaso, com doze tratamentos e quatro repetições. Os tratamentos corresponderam a um fatorial 4x3, sendo quatro doses de nitrogênio (0, 100, 200 e 300 mg/dm 3 ) e três gramíneas forrageiras (B. hibrida cv. BRS Ipyporã, B. humidicola cv. Llanero e Panicum maximum cv. Zuri). Cada parcela experimental foi constituída por vaso de 3 dm³ com três plantas. Foram realizados três cortes de avaliação. A B. hibrida Ipyporã obteve maior resposta à adubação nitrogenada para número de perfilhos e de folhas em relação aos demais capins. Entretanto, para a massa seca total, observou-se que a B. hibrida foi menos responsiva ao nitrogênio que o capim P. maximum (alta exigência) e mais responsivo que B. humidicola (baixa exigência), o que mostra que esse híbrido é uma forrageira com média demanda em nitrogênio. Palavras -chave adubação nitrogenada, teste de identidade de modelos, Urochloa híbrida Abst ractIpyporã grass, a Brachiaria interspecific hybrid was developed by crossing a genotype of Brachiaria ruziziensis (syn. Urochloa ruziziensis) and an access of Brachiaria brizantha (syn. Urochloa brizantha), which have different nitrogen requirements.Therefore, the objective with work was to verify the nitrogen requirement of the interspecific hybrid of Brachiaria hybrid cv.Ipyporã. Experiment was carried out in a greenhouse in a randomized block design, with twelve treatments and four replications. Treatments consisted of a 4 x 3 factorial arrangement, with four nitrogen doses (0; 100; 200 and 300 mg/dm³) and three forages (Brachiaria hybrid cv. BRS Ipyporã, Brachiaria humidicola cv. Llanero and Panicum maximum cv. Zuri). Each experimental plot consisted of a 3 dm³ pot with three plants. Three evaluation harvest were done. B. hybrid had greater response to nitrogen fertilization for number of tillers and leaves than the other forages. However, for the total dry mass, B. hybrid was less responsive to nitrogen than P. maximum grass (high demand) and more responsive than B. humidicola (low demand), which shows that this hybrid has medium nitrogen requirement.

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Produção animal em pastagem de capim-braquiária adubada com nitrogênio

Cited by 12 publications

References 12 publications

Forage accumulation in brachiaria grass under continuous grazing with single or variable height during the seasons of the year

Forage accumulation in brachiaria grass under continuous grazing with single or variable height during the seasons of the year

Bayesian Modelling of the effects of nitrogen doses on the morphological characteristics of braquiaria grass

Nitrogen requirement of Brachiaria hybrid cv. Ipyporã

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