Growth of Megathyrsus maximus cv. Mombaca as affected by grazing strategies and environmental seasonality. I. Tillering dynamics and population stability

Autor(es)

Carneiro da Silva, Sila ^[1] ; Uebele, Marina Castro ^[1] ; de Souza Congio, Guilhermo Francklin ^{[1, 2]} ; Carnevalli, Roberta Aparecida ^[3] ; Sbrissia, Andre Fischer ^[4]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Luiz de Queiroz Coll Agr, Dept Anim Sci, Ave Padua Dias 11, BR-13418900 Piracicaba, SP - Brazil

^[2] Agrosavia, Colombian Corp Agr Res, Km 14 Via Mosquera Bogota, Mosquera 205047, Cundinamarca - Colombia

^[3] Embrapa Dairy Cattle, Brazilian Agr Res Corp, Ave Eugenio do Nascimento 610 Aeroporto, BR-36038330 Juiz De Fora, MG - Brazil

^[4] Santa Catarina State Univ, Dept Anim Prod & Food Sci, Ave Luiz de Camoes 2090, BR-88520000 Lages, SC - Brazil

• Tipo de documento: Artigo Científico
• Fonte: CROP & PASTURE SCIENCE; v. 72, n. 1 JAN 2021.
• Citações Web of Science: 1

Resumo

In rotationally grazed pastures, the canopy light environment can be modulated through both grazing frequency and severity, and the magnitude of sward responses may differ according to forage species and its ability to use available resources. We hypothesised that the tall, tufted, fast-growing, tussock-forming species Mombaca guineagrass (Megathyrsus maximus (Jacq.) B.K.Simon \& S.W.L.Jacobs cv. Mombaca) can modulate its tillering dynamics and change its persistence pathway according to grazing strategy and the availability of growth factors. Treatments corresponded to all combinations of two levels of pre-grazing canopy light interception during regrowth (95% and maximum) and two post-grazing heights (30 and 50 cm), and were allocated to experimental units according to a randomised complete block design with four replications. Measurements were performed throughout contrasting climatic conditions during four seasons from January 2001 to February 2002. A quite stable tiller population density presented regardless of the range of grazing frequency and severity used in the study. However, tiller appearance and death were strongly influenced (P < 0.001) by season of the year, with highest rates recorded during the two summers and lowest during autumn-winter. There was no conclusive evidence that the persistence pathway of Mombaca guineagrass changes within the grazing management strategies studied. (AU)

• Processo FAPESP: 99/11704-0 - Uso de indice de area foliar e interceptacao luminosa como criterio para determinacao do manejo do pastejo para o capim mombaca (panicum maximum (jacq. ). ii. demografia e dinamica populacional de perfilhos.
• Beneficiário: Marina Castro Uebele
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 01/11212-1 - Uso de índice de área foliar e interceptação luminosa como critério para determinação do manejo do pastejo para o capim Mombaça (Panicium maximum (Jacq.)) - III: determinação da estrutura do dossel e quantificação do valor nutritivo da forragem produzida
• Beneficiário: Sila Carneiro da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Regular