Forage productivity and morphogenesis of Axonopus aureus under different nitrogen fertilization rates

AUTOR(ES)

Costa, Newton de Lucena, Moraes, Anibal de, Monteiro, Alda Lúcia Gomes, Motta, Antonio Carlos Vargas, Oliveira, Ricardo Augusto de, Rodrigues, Antonio Neri Azevedo

FONTE

R. Bras. Zootec.

DATA DE PUBLICAÇÃO

2013-08

RESUMO

The effect of nitrogen (N) fertilization (0, 50, 100 and 200 kg N ha-1) on forage yield and morphogenesis of Axonopus aureus was evaluated in the savannas of Roraima State, Brazil. The experimental design was in randomized blocks with three replicates. The grass showed high responsiveness to N fertilization. Dry weight (DW) yield, morphogenetic and structural traits and forage quality were positively affected by N fertilization. The effects of N fertilization on DW yield, N content, leaf appearance rate, leaf elongation rate, number of live leaves/tiller, final leaf length and leaf area index were quadratic and maximum values were estimated with application of 168.8 (2,181 kg ha-1); 124.8 (21.1 g/kg); 158.5 (0.163 leaf/day per tiller); 172.3 (2.75 cm/tiller per day); 155.5 (17.23 cm); 185.5 (7.55 leaves/tiller) and 185.3 (2.22) kg N ha-1, respectively. Tiller population density and leaf senescence rate are directly proportional to increase in N rates, and the opposite occurs for N utilization efficiency and apparent N recovery.

Documentos Relacionados

• Morphogenesis of native grasses of Pampa Biome under nitrogen fertilization
• Forage productivity and quality forage as function of nitrogen fertilization
• Growth index in massai grass under different levels of nitrogen fertilization
• Post-harvest characterization of ‘Prata’ banana cultivar grown under different nitrogen and potassium fertilization
• Metabolism of carbohydrates in Estilosantes cv. Campo Grande under different systems of cultivation and nitrogen fertilization