Agronomical and morphological responses of Panicum maximum Jacq. cv. IPR-86 Milênio, under grazing, and fertilized with nitrogen

Authors

  • Patrícia Sarmento Secretaria de Agricultura e Abastecimento do Estado de São Paulo, Agência Paulista de Tecnologia dos Agronegócios, Instituto de Zootecnia, Centro Avançado de Pesquisa Tecnológica do Agronegócio de Bovinos de Leite, Nova Odessa, SP
  • Luís Roberto de Andrade Rodrigues Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, Jaboticabal, SP
  • Simony Marta Bernardo Lugão Instituto Agronômico do Paraná, Paranavaí, PR
  • Mara Cristina Pessôa da Cruz Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, Jaboticabal, SP
  • Fábio Prudêncio de Campos Secretaria de Agricultura e Abastecimento do Estado de São Paulo, Agência Paulista de Tecnologia dos Agronegócios, Instituto de Zootecnia, Centro Avançado de Pesquisa Tecnológica do Agronegócio de Bovinos de Leite, Nova Odessa, SP
  • Manoel Evaristo Ferreira Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, Jaboticabal, SP

Keywords:

tillers density, residual forage, leaf area index, pasture

Abstract

Aiming to evaluate the effect of nitrogen fertilization (0; 150; 300 and 450 kg/ha/ year of N) on the agronomical and morphological characteristics of Panicum maximum Jacq. cv. IPR-86 Milênio, four grazing cycles were evaluated (GC) with five days of occupation and 35 days of rest period. The total dry mass of forage and of blades in the pre-grazing showed quadratic responses in function of nitrogen application, with maximum productions of 6709 and 3386 kg/ ha/cycle, respectively. The dry mass of stems and senescent material in the pre-grazing increased lineally with nitrogen. In the postgrazing, the nitrogen increased the total dry mass, the stems and the senescent material. LAI in pre and postgrazing, the dry mass of blades and the tillers number in the pre-grazing were higher in GC1 and GC2 (29/11/01 to 17/02/02) than in GC4 (29/03/02 to 08/05/02). LAI in the pre-grazing and the tillers density responded in a quadratic watter to N application, with maximum values of 6,28 and 190 tillers m-2, respectively. The maximum amount of dry mass of blades, maximum LAI and maximum tillers number of grass were estimated in 320; 342 and 263 kg ha-1 of N, respectively.

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Published

2013-11-26

Issue

Section

FORAGE CROPS AND PASTURES

How to Cite

Agronomical and morphological responses of Panicum maximum Jacq. cv. IPR-86 Milênio, under grazing, and fertilized with nitrogen. (2013). Bulletin of Animal Husbandry, 62(4), 333-346. http://bia.iz.sp.gov.br/index.php/bia/article/view/1286

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