Nitrogen nutrition index of Trachypogon plumosus pastures in Roraima´s savannas

Authors

  • Newton Costa Embrapa Roraima
  • Newton de Lucena Costa Eng. Agr., D.Sc., Embrapa Roraima, Boa Vista, RR.
  • Vicente Gianluppi Embrapa Roraima, Boa Vista
  • Anibal de Moraes Departamento de Fitotecnia e Fitossanitarismo da UFPR
  • Paulo César Faccio de Carvalho Departamento de Plantas Forrageiras e Agrometeorologia da UFRGS
  • João Avelar Magalhães Embrapa Meio Norte, Parnaíba

DOI:

https://doi.org/10.22256/PUBVET.V11N8.825-831

Keywords:

Dry matter, N-efficiency utilization, N-apparent recovery

Abstract

The effect of nitrogen levels (0, 40, 80, 120, 160, and 200 kg of N ha-1) on the forage yield and nitrogen nutrition index (NNI) of pastures of Trachypogon plumosus was evaluated under field conditions. Nitrogen fertilization quadratically affected grass forage yields and its nitrogen content, and the maximum values were estimated by the application of 154.6 and 102.1 kg N ha-1, respectively. The critical level of N was reduced with increased grass forage yield. The NNI, for all levels of N evaluated, was insufficient to supply the critical level of N of the grass. The NNI, efficiency of utilization and apparent N recovery were inversely proportional to the increased N levels.

Published

2017-07-17

Issue

Section

Pastagem e forragicultura

How to Cite

Nitrogen nutrition index of Trachypogon plumosus pastures in Roraima´s savannas. (2017). Pubvet, 11(08). https://doi.org/10.22256/PUBVET.V11N8.825-831

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