Structural characteristics signal-grass under continuois stoking and nitrogen fertilization

Authors

  • Rodrigo Vieira de Morais Secretaria de Agricultura e Abastecimento do Estado de São Paulo, Coordenadoria de Assistência Técnica Integral, São José do Rio Pardo, SP
  • Dilermando Miranda da Fonseca Universidade Federal de Viçosa, Departamento de Zootecnia, Viçosa, MG
  • Manoel Eduardo Rozalino Santos Universidade Federal de Viçosa, Departamento de Zootecnia, Viçosa, MG
  • Luciano de Melo Moreira Faculdade de Estudos Administrativos de Minas Gerais, Belo Horizonte, MG
  • Jailson Lara Fagundes Universidade Federal de Sergipe, São Cristóvão, SE
  • Cláudio Mistura Universidade do Estado da Bahia, Salvador, BA
  • Cláudio Manoel Teixeira Vitor Universidade Federal de São João Del-Rei, Prudente de Morais, MG

Keywords:

Brachiaria decumbens, green stem, green leaf blade, grazing, senescent tissue

Abstract

From February to November 2003, the mass and morphological composition of forage from Brachiaria decumbens cv. Basilisk pastures under four different doses of nitrogen (75, 150, 225 and 300 kg/ha/year) were evaluated. The pastures were managed under continuous stocking with growing cattle. The data were grouped within three periods: February to April, May to August and September to November. Randomized block design with subdivided plots and two repetitions was used. The plots correspond to the nitrogen (N) doses, while the subplots to the time of the evaluation. In the period from May to August, the forage mass in the B. decumbens pasture increased linearly related to the N dose. The percentage of green leaf blade (GLB) was lower in the May/August period if compared to the other periods. The highest percentage values for green stem (GS) ocorred February/April. The relation between LFV masses and CV were influenced by the period of evaluation, reaching higher values in September/November. When 75 kg ha-1 of N was applied, the senescent tissue (ST) participation in the pasture did not vary throughout the months of the year. However, when whith doses of 150 kg ha-1 of N were applied, the percentage of ST was lower for February/April in comparison to the other periods. The percentages of GFB and GS increased linearly and positively as the N doses increased in the February/April. The structure of the B. decumbens pasture under continuous stocking is influenced interactively by the nitrogen doses and time of the year. Nitrogen fertilization improves the structure of the B. decumbens pasture under continuous stocking managed with the same mean height.

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Published

2010-01-13

Issue

Section

FORAGE CROPS AND PASTURES

How to Cite

Structural characteristics signal-grass under continuois stoking and nitrogen fertilization. (2010). Bulletin of Animal Husbandry, 67(1), 35-43. http://bia.iz.sp.gov.br/index.php/bia/article/view/1081

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