Forage yield and morphogenesis of Megathyrsus maximus cv. Mombaça under defoliation levels

Authors

  • Newton Costa Embrapa Roraima
  • Claudio Ramalho Townsend Embrapa Clima Temperado, Pelotas, RS
  • Fabíola Helena dos Santos Fogaça Embrapa Meio-Norte, Parnaíba, PI
  • João Avelar Magalhães Embrapa Meio-Norte, Parnaíba, PI
  • Francisco José de Seixas Santos Embrapa Meio-Norte, Parnaíba, PI

DOI:

https://doi.org/10.22256/PUBVET.V11N4.409-414

Keywords:

green dry matter, leaves, tillering, senescence

Abstract

The effect of defoliation levels (20, 30, 40 and 50 cm above soil level) on green dry matter (GDM) yield and morphogenetic and structural characteristics of Megathyrsus maximus cv. Mombaça were evaluated under field conditions in Roraima´s savannas. The effects of defoliation levels 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 38.8; 38.3 and 41.2 cm above soil level, respectively. The population tiller density, number of leaves plant-1 and leaf appearance rate was inversely proportional to the level of defoliation, while the opposite occurred for to medium blade length and leaf senescence rate. Apical meristem removing percentage was higher with increasing defoliation level. Aftermath regrowth showed close negative correlation with defoliation level.

Published

2017-03-27

Issue

Section

Pastagem e forragicultura

How to Cite

Forage yield and morphogenesis of Megathyrsus maximus cv. Mombaça under defoliation levels. (2017). Pubvet, 11(04). https://doi.org/10.22256/PUBVET.V11N4.409-414

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