Morphogenetic and structural characteristics of Megathyrsus maximus cv. Tanzânia-1 under defoliation intensities

Authors

  • Newton Costa Embrapa Roraima
  • Liana Jank Embrapa
  • João Avelar Magalhães Embrapa
  • Antônio Neri Azevedo Rodrigues Instituto Federal de Rondônia
  • Fabíola Helena dos Santos Fogaça Embrapa
  • Amaury Burlamaqui Bendahan Embrapa
  • Francisco José de Seixas Santos Embrapa

DOI:

https://doi.org/10.22256/pubvet.v12n4a67.1-7

Keywords:

Green dry matter, leaves, tillering, senescence

Abstract

The effect of defoliation intensities (20, 30, 40 and 50 cm above soil level) on green dry matter (GDM) yield and morphogenetic and structural characteristics of Megathyrsus maximus cv. Tanzânia-1 were evaluated under field conditions in Roraima´s savannas. The effects of defoliation intensities on the GDM yields, leaf area index and leaf elongation rates was adjusted to the quadratic regression model and maximum values recorded with cutting at 40.9; 38.7 and 35.5 cm above soil level, respectively. The population tiller density, number of leaves plant-1 and leaf appearance rate was inversely proportional to the intensity of defoliation, while the opposite occurred for to medium blade length and leaf senescence rate. Apical meristem removing percentage was higher with increasing defoliation intensity. Aftermath regrowth showed close negative correlation with defoliation intensity level.

References

Published

2018-04-16

Issue

Section

Pastagem e forragicultura

How to Cite

1.
Costa N, Jank L, Magalhães JA, Rodrigues ANA, Fogaça FH dos S, Bendahan AB, et al. Morphogenetic and structural characteristics of Megathyrsus maximus cv. Tanzânia-1 under defoliation intensities. Pubvet [Internet]. 2018 Apr. 16 [cited 2026 Oct. 20];12(04). Available from: https://ojs.pubvet.com.br/index.php/revista/article/view/1147