Morphogenetic and structural characteristics of tillers of guinea grass of different age and grazing severities

Revista Brasileira de Zootecnia

Denise Baptaglin Montagner²  Domicio Do Nascimento Júnior¹  Braulio Maia De Lana Sousa¹  Hélio Henrique Vilela¹  Valéria Pacheco Batista Euclides²  Sila Carneiro Da Silva¹  André Fischer Sbrissia¹  Marciele Neves Carloto² 

[1] ,EMBRAPA Gado de CorteCampo Grande MS

关键词: ecophysiology;    light interception;    Panicum maximum;    stubble height;   

DOI  :  10.1590/S1516-35982011001000006

来源: SciELO

【 摘 要 】

The objective of this research was to evaluate the effects of tiller age on morphogenic and structural characteristics of guinea grass cv. Mombaca subjected to intermittent stocking and three stubble heights: 30 cm, 50 cm and 50-30 cm. Stubble heights were assigned to experimental units in a completely randomized block design with three replicates. Grazing was performed when canopy intercepted 95% of light incidence. Leaf appearance rate, leaf elongation rate and number of live leaves per tiller were higher in the summer when compared with the winter. Contrarily, stem elongation rate, phyllochron and leaf lifespan were lower in the summer when compared with the winter. During the summer, young tillers had higher leaf appearance and elongation rates when compared with the older ones. Young and mature tillers had the highest values of live leaves per tiller in the summer. There was no difference between summer and winter for the final length of leaf blade between tillers of the same age, except in mature tillers, which had higher final leaf length during the summer. Senescence rate of leaves was higher in young tillers, followed by mature and old tillers. Age of tiller affects morphogenic and structural characteristics of pasture, showing that young tillers have better growth compared with mature and old tillers

【 授权许可】

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