Levels of defoliation and regrowth dynamics in elephant grass swards

Ciência Rural

Dias, Kamila Maciel¹  Sbrissia, André Fischer¹  Rodolfo, Giselle Regina¹  Schmitt, Daniel¹ 

[1]Universidade do Estado de Santa Catarina, Lages, Brazil

关键词: morphogenesis;    regrowth stages;    Pennisetum purpureum;    grazing management;    pioneiro-grass;   

DOI  :  10.1590/0103-8478cr20141094

学科分类：农业科学（综合）

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

【 摘 要 】

The morphogenetic and structural characteristics of forage plants and the processes of growth and senescence in tissues may vary according to the grazing management strategies used. This research aimed to assess the process of regrowth in elephant grass swards Cv. 'Pioneiro' submitted to two pre-grazing heights (90 and 120cm) combined with two levels of defoliation (50 and 70%). A reduction of the leaf elongation rate (LER) was observed during the regrowth stages, in addition to a reduction in the rate of leaf appearance (LAR) and aerial tiller population density (ATPD). In contrast, an increase was observed in leaf senescence (LSR) and stem and pseudo stem elongation rates (SER). The severe defoliation (70%) combined with a pre-grazing height of 120cm compromised the regrowth of elephant grass cv. 'Pioneiro', which must be managed with a maximum height of 90cm and maximum level of defoliation of 50% of the initial height.

【 授权许可】

Unknown