Loading…

Initial height of pasture deferred and utilized in winter and tillering dynamics of signal grass during the following spring/Altura inicial do pasto diferido e utilizado no inverno e dinamica do perfilhamento do capim-braquiaria durante a primavera subsequente

Tillering dynamics during regrowth in the spring (September to December 2009) on signal grass (Brachiaria decumbens cv. Basilisk) pastures deferred in the beginning of April 2009 is evaluated. Four pasture heights were evaluated at the beginning of deferment (10, 20, 30 and 40 cm). The experimental...

Full description

Saved in:
Bibliographic Details
Published in:Acta scientiarum. Animal sciences 2014-01, Vol.36 (1), p.17
Main Authors: Santana, Sabrina Saraiva, da Fonseca, Dilermando Miranda, Santos, Manoel Eduardo Rozalino, Sousa, Braulio Maia de Lana, Gomes, Virgilio Mesquita, do Nascimento, Domicio Jr
Format: Article
Language:Spanish
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Tillering dynamics during regrowth in the spring (September to December 2009) on signal grass (Brachiaria decumbens cv. Basilisk) pastures deferred in the beginning of April 2009 is evaluated. Four pasture heights were evaluated at the beginning of deferment (10, 20, 30 and 40 cm). The experimental design consisted of completely randomized blocks with two replications. Rise in pasture height at the beginning of deferment decreased the appearance rate, increased the mortality rate and reduced the survival rate, the balance between appearance and mortality and the stability index of the tiller population at the beginning of the spring. Pastures deferred at initial height of 30 and 40 cm presented relatively stable tiller appearance rate between the beginning and end of spring. However, these pastures presented greater mortality rate, lower survival rate, lower balance between appearance and mortality and lower stability index of the tiller population at the beginning of spring when compared to rates at the end of spring. Pastures managed with shorter initial heights (10 and 20 cm) provided more tissue renewal in the subsequent growth season after their utilization in the winter. Keywords: Brachiaria decumbens, pasture deferment, plant ecophysiology, seasonality. O trabalho foi realizado para avaliar a dinamica do perfilhamento durante a rebrotacao na primavera (setembro a dezembro de 2009) em pastos de capim-braquiaria (Brachiaria decumbens cv. Basilisk) diferidos no inicio de abril de 2009. Foram avaliadas quatro alturas do pasto no inicio do diferimento (10, 20, 30 e 40 cm). O delineamento experimental utilizado foi o de blocos completos casualizados com duas repeticoes. A elevacao na altura do pasto no inicio do diferimento diminuiu a taxa de aparecimento, aumentou a taxa de mortalidade e reduziu a taxa de sobrevivencia, o balanco entre aparecimento e mortalidade e o indice de estabilidade da populacao de perfilhos no inicio da primavera. Pastos diferidos com altura inicial de 30 e 40 cm apresentaram taxa de aparecimento de perfilhos relativamente estaveis entre o inicio e final da primavera. Contudo, esses pastos apresentaram maior taxa de mortalidade, menor taxa de sobrevivencia, menor balanco entre aparecimento e mortalidade e menor indice de estabilidade da populacao de perfilhos no inicio da primavera em relacao ao final da primavera. Pastos manejados com menor altura inicial (10 e 20 cm) apresentam maior renovacao de tecidos na estacao de cresciment
ISSN:1806-2636
DOI:10.4025/actascianimsci.v36i1.20463