Skip to main content
padlock icon - secure page this page is secure

Open Access Demografia do perfilhamento e taxas de acúmulo de matéria seca em capim 'Tifton 85' sob pastejo Tiller demography and dry matter accumulation rates in 'Tifton 85' swards under grazing

Download Article:

The full text article is available externally.

The article you have requested is supplied via the DOAJ. View from original source.

Neste ensaio foram avaliados os parâmetros de densidade populacional, taxas de emissão e de mortalidade, proporção de perfilhos florescidos e acúmulo de matéria seca de forragem para a espécie Cynodon spp. cultivar Tifton 85. Os tratamentos corresponderam a quatro situações de altura do pasto (5, 10, 15 e 20 cm) mantidas constantes por ovinos sob regime de lotação contínua e taxa de lotação variável. O delineamento experimental foi o de blocos completos casualizados com quatro repetições. Foram utilizadas áreas (&60;FONT FACE&61;"Symbol"&62;&64;&60;/FONT&62; 0,0176 m²) delimitadas por anéis plásticos (PVC), onde todos os perfilhos existentes foram marcados com pequenas argolas plásticas coloridas e contados a cada avaliação. As taxas de acúmulo de matéria seca foram avaliadas utilizando-se a técnica da gaiola de exclusão, com mensuração da massa de forragem a cada 21 dias. Houve efeito (P&60;0,10) de data e/ou período de amostragem sobre todas as variáveis estudadas. As maiores densidades populacionais foram verificadas para os pastos mantidos baixos (5 cm), bem como as maiores taxas de aparecimento e mortalidade. As taxas de mortalidade foram determinantes básicos das densidades populacionais de perfilhos. Ocorreu grande renovação da população de perfilhos durante a estação do verão. Não houve efeito (P&62;0,10) de tratamento sobre as taxas de acúmulo de forragem.&60;br&62;The aim of this study was to verify patterns of tiller population density, tiller appearance and mortality rates, proportion of flowering tillers and herbage dry matter accumulation for Cynodon spp. (cv. Tifton 85). Treatments corresponded to four "steady state" conditions characterised by sward surface heights of 5, 10, 15, and 20 cm, maintained by sheep grazing under continuous stocking and variable stocking rate. Treatments were allocated to experimental units (400 m² each) according to a completetely randomised block design with four replication. Tillering evaluations consisted of tagging and counting all tillers present and new tillers emerging within two 15 cm diameter plastic rings (PVC) per experimental unit. Herbage accumulation was measured using exclosure cages rotated every three weeks. There was a time effect (P&60;0,10) for all response variables studied. Short swards (5 cm) presented the highest values for tiller population densities as well as the highest rates of tiller appearance and mortality. Tiller mortality rates were very influential on tiller density population. A great turnover in tiller population occurred during the summer period, suggesting that a high tiller population density should be maintained during autumn and winter. There was no treatment effect on herbage accumulation rates (P&62;0,10).
No References
No Citations
No Supplementary Data
No Article Media
No Metrics

Document Type: Research Article

Publication date: January 1, 2000

  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more