Morphogenetic and structural characteristics of andropogon grass submitted to different cutting heights

Revista Brasileira de Zootecnia

Braulio Maia De Lana Sousa¹  Domicio Do Nascimento Júnior¹  Sila Carneiro Da Silva²  Hélida Christhine De Freitas Monteiro¹  Carlindo Santos Rodrigues¹  Dilermando Miranda Da Fonseca¹  Márcia Cristina Teixeira Da Silveira¹  André Fischer Sbrissia² 

[1] ,UFV Departamento de ZootecniaMG

关键词: Andropogon gayanus;    ecophysiology;    light interception;    morphogenesis;    sward height;    altura do dossel;    Andropogon gayanus;    ecofisiologia;    interceptação luminosa;    morfogênese;   

DOI  :  10.1590/S1516-35982010001000006

来源: SciELO

【 摘 要 】

This work was performed aiming to evaluate the morphogenetic and structural characteristics of Andropogon gayanus cv. Planaltina species submitted to three cutting heights (20, 27 and 34 cm). The three cutting heights were allocated in experimental units (12 m²) in a complete randomized block design with three replications. The cuts were done when the light interception by the sward reached 95%. At this moment, the sward height revealed itself constant with values close to 50 cm. The lowest cutting height (20 cm) influenced negatively the final leaf blade length, the number of live leaves, the leaf lifespan, the stem elongation rate and the tiller population density, and it influenced positively the phyllochron and the leaf senescence rate. Probably, cuts at 20 cm height caused a high decapitation and death of the tillers. The worst growth conditions in addition to the blossom of this specie occurred during fall resulted in higher stem elongation rates and number of live leaves, and lower phyllochron, final leaf blade length, and leaf lifespan. The sward height can be used as a practical and efficient criterion in the management of andropogon grass. Under intermittent management conditions, the regrowth of andropogon grass must be interrupted when the sward reaches 50 cm height, and the defoliation must be interrupted when the stubble height is close to 27 cm.

【 授权许可】

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