Botanical composition of a natural rangeland overseeded with annual ryegrass under N fertilization


  • M.R. Ávila Universidad Nacional de Trujillo
  • C. Nabinger Universidade Federal do Rio Grande do Sul, Porto Alegre.
  • R. Schneider-Canny Noble Research Institute, Oklahoma, EUA.
  • J.K. Fedrigo Universidad de la República Oriental del Uruguay.


Palabras clave:

Rangeland fertilization, nitrogen, annual ryegrass, biomass.


The fertilization in rangelands has a positive effect in the forage production.  The increased nitrogen (N) availability improves plant growth and forage quality of native pastures. However, in the Pampa biome conditions of Rio Grande do Sul State, Brazil, these responses occur surprisingly fast and consistently. Therefore, the objective of this work was to quantify the N effect in the botanical composition of a natural pasture overseeded with annual ryegrass in Southern Brazil. The effects of three rates of N fertilization (zero, 100 and 200 kg N ha-1) were evaluated. Forage biomass was estimated on a monthly basis using the double sampling approach. The different botanical components of each forage sample were manually sorted in the laboratory. In order to calculate the Rényi diversity profile, two floristic composition evaluations were performed in the experimental area in December of 2010 and September of 2011. The ryegrass biomass production is highly affected by the N fertilization. The botanical composition of natural pastures modifies most probably by increasing ryegrass competition at early spring.


Ávila, M.R.A.; Nabinger, C.; Brambilla, D.M.; Carassai, I.J; Kunrath, TR. 2013. The effects of nitrogen enrichment on tiller population density and demographics of annual ryegrass overseeded on natural pastures South of Brazil. African Journal of Agricultural Re-search 8(23): 3013-3018.

Allen, V.G.; Batello, C.; Berretta, E.J.; Hodgson, J.; Kothmann M.; Li X. et al. 2011. An international terminology for grazing lands and grazing animals. Grass and Forage Science 66: 2-28.

Boggiano, P.R.; Marachin, G.E.; Nabinger, C. et al. 2000. Efeito da adubação nitrogenada e oferta de forragem sobre a carga animal, produção e utilização da matéria seca numa pastagem nativa do Rio Grande do Sul. In: Proceedings of 37 Reunião da Sociedade Brasileira de Zootecnia. SBZ, Viçosa, MG.

Chapin, F.S.; Walker, B.H.; Hobbs, R.J.; Hooper, D.U.; Lawton, J.H.; Sala, O.E.; Tilman, D. 1997. Biotic control over the functioning of ecosystems. Science 277(5325), 500-504.

Hill, M.O. 1973. Diversity and evenness: a unifying notation and its consequences. Ecology 54: 427-473.

Hughes, H.D.; Metcalfe, D.S. 1972. Pasture and pasture improvement. In: Crop Production (eds. Hughes DT & Metcalfe DS). MacMillan: New York, pp. 225-241.

Jaurena, M.; Lezama, F.; Salvo, L.; Cardozo, G.; Ayala, T.J.; Nabinger, G. 2016. The Dilemma of Improving Native Grasslands by Oversee-ding Legumes: Production Intensification or Diversity Conservation. Rangeland Ecology & Management 69: 35-42.

Pereira, C.H; Patino, O.P.; Hoshideb, A.K.; Abreu, D.C.; Rotz, A.; Nabinger, C. 2018. Grazing supplementation and crop diversification benefits for southern Brazil beef: A case study. Agricultural Systems 162: 1-9.

Sanderson, M.A.; Stair, D.W.; Hussey, M.A. 1997. Physiological and morphological responses of perennial forages to stress. Advances in Agronomy, San Diego 59: 171-224.

Storkey, J.; Macdonald, AJ.; Poulton, PR.; Scott, T; Köhler, IH.; Schnyder, H.; Goulding, K.W.T.; Crawley, J. 2015. Grassland biodiversity bounces back from long-term nitrogen addition. Nature 528: 401-404.

Wilm, H.G.; Costello, D.F.; Klipple, G.E. 1944. Estimating forage yield by the double sampling method. Journal of American Society of Agronomy 36: 194-203.

Received February 11, 2019.

Accepted March 17, 2019.

Corresponding author: (M. Ávila).



Cómo citar

Ávila, M., Nabinger, C., Schneider-Canny, R., & Fedrigo, J. (2019). Botanical composition of a natural rangeland overseeded with annual ryegrass under N fertilization. Scientia Agropecuaria, 10(2), 303-305.



Comunicación Corta