Tiller demography and dry matter accumulation in Florakirk (Cynodon spp) grazed swards

Authors

  • Carlos Augusto Brandão de Carvalho Universidade de São Paulo, Escola Superior de Agricultura Luiz de Queiroz, Departamento de Produção Animal, Piracicaba, SP
  • Sila Carneiro da Silva Universidade de São Paulo, Escola Superior de Agricultura Luiz de Queiroz, Departamento de Produção Animal, Piracicaba, SP
  • Roberta Aparecida Carnevalli Universidade de São Paulo, Escola Superior de Agricultura Luiz de Queiroz, Departamento de Produção Animal, Piracicaba, SP
  • André Fischer Sbrissia Universidade de São Paulo, Escola Superior de Agricultura Luiz de Queiroz, Departamento de Produção Animal, Piracicaba, SP
  • Luiz Felipe de Moura Pinto Universidade de São Paulo, Escola Superior de Agricultura Luiz de Queiroz, Departamento de Produção Animal, Piracicaba, SP
  • Jailson Lara Fagundes Universidade de São Paulo, Escola Superior de Agricultura Luiz de Queiroz, Departamento de Produção Animal, Piracicaba, SP
  • Carlos Guilherme Silveira Pedreira Universidade de São Paulo, Escola Superior de Agricultura Luiz de Queiroz, Departamento de Produção Animal, Piracicaba, SP

Keywords:

Cynodon, tillering, flowering, herbage accumulation

Abstract

The objective of this study was to evaluate the tiller demography and dynamics of Cynodon spp cv. Florakirk swards. Experimental treatments corresponded to four “steady state” conditions characterised by sward surface heights (SSH) of 5, 10, 15, and 20 cm maintained by sheep under continuous stocking and variable stocking rate. Treatments were allocated to experimental units according to a complete randomised block design, replicated four times. Tillering evaluations consisted of tagging and counting of all tillers present and new tillers born within two 15 cm diameter plastic rings (PVC) per experimental unit. Pasture responses evaluated were: tiller population density (TPD), tiller natality (TNR) and mortality rates (TMR), proportion of flowering tillers (PFT). Additionally, herbage accumulation (HDMA) was measured using exclosure cages. There was a time effect on all studied variables (P<0.05). The highest TNR and TMR were observed during summer, indicating a high turnover in tiller population at that time of the year. No correlation was observed between TPD and HDMA (r=0,14) throughout the experimental period. PFT was very influential on TNR and TMR. Intense flowering influenced significantly TNR and TMR. Variations in SSH should be used in order to ensure the maintenance of high TNR during periods of high TMR.

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Published

2013-12-03

Issue

Section

FORAGE CROPS AND PASTURES

How to Cite

Tiller demography and dry matter accumulation in Florakirk (Cynodon spp) grazed swards. (2013). Bulletin of Animal Husbandry, 57(1), 39-51. http://bia.iz.sp.gov.br/index.php/bia/article/view/902

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