Caracter赤sticas produtivas do capim-braqui芍ria submetido a intervalos de cortes e aduba o nitrogenada durante tr那s esta es = Productive traits of Brachiaria grass subject to cutting intervals and nitrogen fertilization over three seasons

作者：Camila Maida de Albuquerque Maranho; Paulo Bonomo; Aureliano Jose Vieira Pires; Alexsandro Cotrim Pimentel Ribeiro Costa

来源：Acta Scientiarum - Animal Sciences, 2010.

• altura
• Brachiaria decumbens
• produ o diaria
• teor de materia seca
• height
• daily production
• dry matter rate

Objetivou-se com este estudo avaliar a produtividade do capim-braqui芍ria submetido a diferentes intervalos de cortes e aduba o nitrogenada, nos per赤odos do ver o, do outono e do inverno. O experimento foi instalado na Universidade Estadual do Sudoeste da Bahia em 芍rea j芍 estabelecida de Brachiaria decumbens cv. Basilisk. Foi conduzido em esquema fatorial 5 x 2, sendo cinco intervalos de cortes (21, 28, 35, 42 e 49 dias) e duas doses de nitrog那nio (0 e 200 kg N ha-1). O delineamento utilizado foi o de blocos ao acaso com quatro repeti es. As vari芍veis analisadas foram: altura do dossel (cm), teor de mat谷ria seca (%), produ o de mat谷ria seca total (PMS, ton ha-1) e produ o di芍ria de mat谷ria seca (kg MS dia-1). A aduba o aumentou em 40,8% a altura da planta no ver o e 18,2% no outono. O teor de mat谷ria seca aumentou nas tr那s esta es do ano, em fun o do aumento do intervalo de cortes. A aduba o nitrogenada aumentou a PMS do capim-braqui芍ria em 96,8% no ver o e 10,3% no inverno, no outono n o houve efeito (p %26gt; 0,05). O intervalo de cortes vari芍vel (39 dias no ver o e 21 dias no outono e inverno) mostra-se mais eficientequanto 角 produ o di芍ria de forragem. The productivity of Brachiaria grass with different cutting intervals and nitrogen fertilization during summer, autumn and winter is evaluated. The experiment, undertaken in a region featuring Brachiaria decumbens cv. Basilisk at the State University of Southwest Bahia, had a 5 x 2 factorial arrangement with five cutting intervals (21, 28, 35, 42 and 49 days) and two nitrogen levels (0 and 200 kg N ha-1) in a randomized block design with four replications. The variables analyzed consisted of canopy height (cm), dry matter rate (%), dry matter production (ton ha-1) and total daily production of dry matter (kg DM day-1). Fertilization increased height of plant by 40.8 and 18.2% respectively during summer and autumn. Dry matter rate increased in the three seasons in proportion to increase in cutting intervals. Although Nitrogen fertilization increased TDM of Brachiaria grass by 96.8 and 10.3% respectively during the summer andwinter, there was no significant (p %26gt; 0.05) in autumn. Variable cutting intervals (39 days in the summer and 21 days in autumn and winter) was more effective in daily forage production when compared to corresponding intervals.