Forage accumulation and morphogenesis of Megathyrsus maximus cv. Mombaça under phosphorus levels

Authors

  • Newton Costa Embrapa Roraima
  • Newton de Lucena Costa Embrapa Roraima, Boa Vista, RR
  • Liana Jank Pesquisador da Embrapa Gado de Corte, Campo Grande, MS
  • João Avelar Magalhães Pesquisador da Embrapa Meio-Norte, Parnaíba, PI
  • Vicente Gianluppi Pesquisador da Embrapa Roraima, Boa Vista, RR
  • Fabíola Helena dos Santos Fogaça Pesquisador da Embrapa Meio-Norte, Parnaíba, PI
  • Amaury Burlamaqui Bendahan Embrapa Roraima, Boa Vista, RR
  • Francisco José de Seixas Santos Pesquisador da Embrapa Meio-Norte, Parnaíba, PI

DOI:

https://doi.org/10.22256/PUBVET.V11N11.1163-1168

Keywords:

dry matter, leaves, tillering, senescence

Abstract

The effect of phosphorus levels (0, 30, 60, 90 and 120 kg of P2O5 ha-1) on green dry matter (GDM) yield and morphogenetic and structural characteristics of Megathyrsus maximus cv. Mombaça was evaluated under field conditions. Phosphorus fertilization increased significantly GDM yields, P concentrations, density population of tillers (DPT), number of leaves plant-1 (NLP), medium blade length (MBL), leaf area index (LAI), leaf senescence rate (LSR), leaf appearance (LAR) and elongation rates (LER). Maximum GDM yields, LAR, LER, NT, NLT, LAI and MBL were obtained with the application of 96.1; 58.6; 69.8; 97.5; 64.4; 75.6 and 79.2 kg of P2O5 ha-1, respectively. The P critic level, related to 80% of GDM maximum production, was estimated at 1.692 g kg-1. The P efficiency utilization was inversely proportional to the P rates applied.

Published

2017-09-11

Issue

Section

Pastagem e forragicultura

How to Cite

Forage accumulation and morphogenesis of Megathyrsus maximus cv. Mombaça under phosphorus levels. (2017). Pubvet, 11(11). https://doi.org/10.22256/PUBVET.V11N11.1163-1168

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