Number and morphology of tiller age groups during summer in Marandu palisadegrass pastures previously used under deferred grazing

Bioscience Journal

Lucas Santos de Moraes¹  Gustavo Jordan da Silva Queiroz¹  Larissa Lais Santos do Carmo¹  Manoel Eduardo Rozalino Santos²  Gabriel de Oliveira Rocha³  Bruno Humberto Rezende Carvalho⁴  Flávia de Oliveira Scarpino Van Cleef⁵  Angélica Nunes de Carvalho⁶ 

[1] Discente em Zootecnia na Universidade Federal de Uberlândia;Docente na Universidade Federal de Uberlândia;Doutorando na Universidade Federal de Uberlândia;Mestrando na Universidade Federal de Uberlândia;Mestre em Zootecnia pela UNESP/Jaboticabal.;Mestre pela Universidade Federal de Uberlândia;

关键词: morphological composition;    mowing;    sward height;    tillering dynamics;    urochloa brizantha;    brachiaria brizantha syn;   

DOI  :  10.14393/BJ-v36n1a2020-42215

来源: DOAJ

【 摘 要 】

The relative contribution of young, mature and old tillers in the canopy influences the production and structure of the pasture. The objective with this work was to evaluate the balance between tiller appearance and tiller death (BAL) during spring and early summer, the morphology and percentages of young, mature and old tillers in Brachiaria brizantha cv. Marandu (marandu palisadegrass) with three conditions in late winter: short (24.1 cm), tall (49.0 cm) and tall (50.0 cm)/mown (8 cm). Tall and tall/mown pastures presented higher BAL in September and October, respectively. In January, BAL was higher in short and tall/mown pastures than in tall pasture. The tiller number was higher in short pasture, intermediate in tall/mown pasture and lower in tall pasture. The percentage of old tillers was higher in short and tall pastures compared to tall/mown pasture. The percentage of live leaf lamina reduced, while the percentage of dead leaf lamina increased with tiller age. Mowing of the tall marandu palisadegrass pasture in late winter increases the renewal of tillers in the spring and decreases the percentage of old tillers in the summer. The old tillers present worse morphology than young tillers.

【 授权许可】

Unknown