Abstract #W165
Section: Forages and Pastures
Session: Forages and Pastures: General forages and forage systems
Format: Poster
Day/Time: Wednesday 7:30 AM–9:30 AM
Location: Gatlin Ballroom
Session: Forages and Pastures: General forages and forage systems
Format: Poster
Day/Time: Wednesday 7:30 AM–9:30 AM
Location: Gatlin Ballroom
# W165
Balance between the emergence and mortality of tiller in Brachiaria brizantha under variable heights in winter.
Manoel Eduardo Rozalino Santos*1, Ludiêmilem Keith Parreira da Costa1, Bruno Humberto Rezende Carvalho1, Denis Douglas Pessoa1, Heron Alves de Oliveira1, Roger Carvalho Cardoso1, Miriã Gonçalves Simplício1, Simone Pedro da Silva2, Dilermando Miranda Fonseca3, 1Universidade Federal de Uberlândia, Uberlândia, Minas Gerais, Brazil, 2Instituto Federal Goiano, Hidrolândia, Goias, Brazil, 3Universidade Federal de Viçosa, Viçosa, Minas Gerais, Brazil.
Key Words: defoliation, tiller density population, seasons of the year
Balance between the emergence and mortality of tiller in Brachiaria brizantha under variable heights in winter.
Manoel Eduardo Rozalino Santos*1, Ludiêmilem Keith Parreira da Costa1, Bruno Humberto Rezende Carvalho1, Denis Douglas Pessoa1, Heron Alves de Oliveira1, Roger Carvalho Cardoso1, Miriã Gonçalves Simplício1, Simone Pedro da Silva2, Dilermando Miranda Fonseca3, 1Universidade Federal de Uberlândia, Uberlândia, Minas Gerais, Brazil, 2Instituto Federal Goiano, Hidrolândia, Goias, Brazil, 3Universidade Federal de Viçosa, Viçosa, Minas Gerais, Brazil.
The experiment was conducted to evaluate 3 different defoliation strategies of Brachiaria brizantha (palisadegrass) in winter. From April 2013 to March 2014, the palisadegrass were evaluated at the Federal University of Uberlândia, located in the State of Minas Gerais, Brazil. The experimental site was located at 776 m altitude, 18°30′ S and 47°50′ W. Annual precipitation was around 1.584 mm. Medium temperature was 22.3°C. The experimental area was made up of 12 plots (experimental units) of 9 m2. In one management strategy, palisadegrass was maintained at 30 cm high during all the trial. In the other, the palisadegrass was kept at an average of 15 cm during the winter (July to September 2013), and at 30 cm from the early spring until the summer (October 2013 to March 2014). At last, the palisadegrass was kept at an average of 45 cm during the winter and at 30 cm from the early spring until the summer. The experiment was carried out using a randomized completely design with 4 repetitions and subdivided plots. The defoliation strategies correspond to plots. The year seasons were the subplots. In each experimental unit, all tillers inside the 2 frames with 0.0625 m2 were counted and marked with colored plastic. Every 30 d, all tillers were recounted and new tillers were marked with a different wire color. The collected data were used to calculate the balance between the emergence and mortality of tiller (BAL). The tillers number was quantified in each season year. The BAL was (P < 0.05) lower in winter (−7.2%) and later spring (−5.0%), intermediate in summer (11.6%) and higher in early spring (26.2%). This response pattern was due to unfavorable weather conditions in winter. On the other hand, the high development of shoots in tillers in early spring may have generated higher shading at plant base in late spring, causing negative BAL. The defoliation strategies did not affect the BAL. We conclude that palisadegrass keep with 15 cm in winter showed higher tiller number during all experimental period, when compared with grass with 30 and 45 cm in winter.
Key Words: defoliation, tiller density population, seasons of the year
