Rio Grande do Sul State's (Brazil) native grasses morphogenesis under rotational grazing during spring and summer

Ciência Rural

Confortin, Anna Carolina Cerato¹  Ribeiro, Bruna San Martim Rolim²  Quadros, Fernando Luiz Ferreira de²  Santos, Aline Bosak dos¹  Severo, Paula de Oliveira²  Casanova, Pedro Trindade²  Seibert, Liane²  Machado, Greice Kelly Gomes² 

[1] Instituto Federal de Educação, Alegrete, Brasil;Universidade Federal de Santa Maria (UFSM), Santa Maria, Brasil

关键词: grazing;    leaf elongation duration;    management;    morphogenesis;   

DOI  :  10.1590/S0103-84782014000100016

学科分类：农业科学（综合）

来源: Universidade Federal de Santa Maria * Centro de Ciencias Rurais

【 摘 要 】

The influence of rotational grazing intervals on morphogenesis of five native grasses from Rio Grande do Sul state (RS) central region, grouped according to a functional typology, was evaluated during spring and summer seasons. Leaf appearance rate, leaf elongation rate and leaf senescence rate (LAR/LER/LSR) phyllochron, leaf lifespan and leaf elongation duration (LLP/LED) were evaluated on Axonopus affinis, Aristida laevis, Andropogon lateralis, Paspalum notatum and Paspalum plicatulum, under two rotational grazing intervals, defined by thermal time (°C), 375 and 750 degree-day, during 2010 spring and 2010/2011 summer. There was no significant difference between grazing intervals, but there was among species and between seasons. Paspalum notatum highlights significant adjustments to grazing. Axonopus affinis and P. notatum presented the largest LAR and smallest LLP, while A. lateralis presented morphogenic characteristics which contradict literature. Spring and summer was characterized as the growing and flowering periods, respectively. Grazing showed influence on forage morphogenesis, however, the evaluated grazing intervals had no effect on species development and the seasonal influence define native grasses development.

【 授权许可】

CC BY-NC