Assessment of the nutritional status of grassland: nitrogen nutrition index

Autores

  • Laércio Ricardo Sartor Universidade Tecnologica Federal do Paraná
  • Tangriani Simioni Assmann Universidade Tecnologica Federal do Paraná
  • André Brugnara Soares Universidade Tecnologica Federal do Paraná
  • Paulo Fernando Adami Instituto Federal do Paraná
  • Alceu Luis Assmann Instituto Agronômico do Paraná
  • Sidney Ortiz Universidade Tecnológica Federal do Paraná

DOI:

https://doi.org/10.5433/1679-0359.2014v35n1p449

Palavras-chave:

Dilution curve, Fertility, Forage production, Nutritive value, Urochloa plantaginea.

Resumo

The aim of this study was to assess the Nitrogen Nutrition Index (NNI) of an Urochloa plantaginea pasture submitted to different nitrogen (N) levels and forage mass (FM) through dilution curve model. The experimental design was a random block with six treatments in a factorial scheme. The treatments combination consisted of three nitrogen levels (0, 200 and 400 kg ha-1 of N) and two forage mass (low mass at 2,000 kg ha-1 of DM and high mass at 3,600 kg ha-1 of DM) in a continuous stocking rate grazing method. Urochloa plantaginea forage production was higher at the nitrogen intermediate level (200 kg ha-1 of N), being 31% superior than treatment without nitrogen, which showed unsatisfactory nitrogen nutritional index and due to it, limited forage growth. This fact was not observed at the 400 kg ha-1 of N, where nitrogen luxury consumption occurred showed by the satisfactory levels of this nutrient in the plant tissue. Nitrogen dilution curve allows the diagnosis of the plants nutritional status.

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Biografia do Autor

Laércio Ricardo Sartor, Universidade Tecnologica Federal do Paraná

Prof. da Universidade Tecnológica Federal do Paraná, UTFPR, Dois Vizinhos, PR, Brasil.

Tangriani Simioni Assmann, Universidade Tecnologica Federal do Paraná

Prof. da UTFPR, Pato Branco, PR, Brasil.

André Brugnara Soares, Universidade Tecnologica Federal do Paraná

Prof. da UTFPR, Pato Branco, PR, Brasil.

Paulo Fernando Adami, Instituto Federal do Paraná

Prof. do Instituto Federal do Paraná, Palmas, PR, Brasil.

Alceu Luis Assmann, Instituto Agronômico do Paraná

Pesquisador do Instituto Agronômico do Paraná, IAPAR, Pato Branco, PR, Brasil.

Sidney Ortiz, Universidade Tecnológica Federal do Paraná

Discente do Programa de Pós Graduação em Zootecnia, UTFPR, Dois Vizinhos, PR, Brasil.

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Publicado

2014-02-27

Como Citar

Sartor, L. R., Assmann, T. S., Soares, A. B., Adami, P. F., Assmann, A. L., & Ortiz, S. (2014). Assessment of the nutritional status of grassland: nitrogen nutrition index. Semina: Ciências Agrárias, 35(1), 449–456. https://doi.org/10.5433/1679-0359.2014v35n1p449

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