Growth and bromatological characteristics of Brachiaria decumbens and Brachiaria ruziziensis under shading and nitrogen

• Autor(a) principal: Garcia da Silva, Arlindo
• Data de Publicação: 2018
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Revista ciência agronômica (Online)
• Texto Completo: http://periodicos.ufc.br/revistacienciaagronomica/article/view/88747
• topic: Crude protein. Fibrous fraction. Silvopastoral systems. Tillering. Tropical grasses. Urochloa.

This study aimed to evaluate the productive and qualitative characteristics of Brachiaria decumbens andBrachiaria ruziziensis subjected to three levels of artificial shading (0, 36 and 54%) and four nitrogen (N) doses (0; 50; 100and 150 mg dm-3 soil), using completely randomized design with a factorial scheme 2 x 3 x 4, with three replications. The drymatter production (DMP), the number of tillers per pot, root weight and crude protein (CP) and neutral detergent fiber (NDF)contents were evaluated. Both grasses responded quadractly to N, but B. ruziziensis presented greater production under thetwo highest N doses. The tillers density increased with N dose and was reduced under shading. The root weight increased withN dose, linearly in the full sun and quadractly in the shade. The shading and N showed a positive influence on CP contents.For NDF content, was observed reduction with increase of N dose. The NDF content of B. decumbens increased with shadinglevels; for B. ruziziensis, the greatest value was observed under intermediate shading level. The N fertilization is an importantstrategy to improve DMP, tillers density and CP content, for both grasses. However, intense shading should be avoided, as itreduces tillering and root weight, which may threat pasture persistence.