Defoliation dynamics of Brachiaria brizantha pastures with distinct structural characteristics

Authors

  • Patrick Bezerra Fernandes Universidade Federal de Mato Grosso do Sul
  • Rodrigo Amorim Barbosa Empresa Brasileira de Pesquisa Agropecuária
  • RaÍsa Turcato de Oliveira Instituto Federal de Educação, Ciência e Tecnologia Goiano
  • Caio Vinicio Vargas de Oliveira Instituto Federal de Educação, Ciência e Tecnologia Goiano
  • Cauby de Medeiros-Neto Universidade do Estado de Santa Catarina

DOI:

https://doi.org/10.14393/BJ-v36n1a2020-42211

Keywords:

Defoliation severity, Grazing frequency, Leaf area index, Rotational stocking

Abstract

Although belonging to the same species, different Brachiaria brizantha varieties used for pasture vary significantly in their morphological structure. Therefore, this study starts from the central hypothesis that the defoliation dynamics during the period of occupation by animals in pastures formed by Brachiaria brizantha under rotational stocking varies among cultivars during the year. The experimental design used was randomized blocks with three treatments and three repetitions, with the cultivars consisting of Brachiaria brizantha cv. Xaraés, BRS Paiaguás, and Ecótipo B4. The defoliation patterns during the grazing periods were estimated using the marked tiller technique. Despite alterations in the tiller and forage mass components in the wet and dry seasons, no variations were observed in the tiller defoliation dynamics and the respective structural components. In the wet season, the area grazed only once was greater for BRS Paiaguás compared to the other two cultivars, but the other areas representing the grazing horizons were equally exploited among the grass varieties during the year. Therefore, based on the defoliation dynamics of pastures in Brazil’s tropical climate, it is possible to suggest that pastures formed by grasses with different structures and growth habits can be submitted to similar management strategies without impairing the forage canopy exploitation by the animals.

Downloads

Download data is not yet available.

Downloads

Published

2020-01-01

How to Cite

FERNANDES, P.B., BARBOSA, R.A., DE OLIVEIRA, R.T., DE OLIVEIRA, C.V.V. and MEDEIROS-NETO, C. de, 2020. Defoliation dynamics of Brachiaria brizantha pastures with distinct structural characteristics. Bioscience Journal [online], vol. 36, no. 1, pp. 203–211. [Accessed7 December 2022]. DOI 10.14393/BJ-v36n1a2020-42211. Available from: https://seer.ufu.br/index.php/biosciencejournal/article/view/42211.

Issue

Section

Agricultural Sciences