Abstract
) 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.
Highlights
In Roraima State, Brazil, burning is a practice commonly utilized in the management of native pasture because of its low cost and easy application
The effects of N fertilization on Dry weight (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
Summary
In Roraima State, Brazil, burning is a practice commonly utilized in the management of native pasture because of its low cost and easy application. In the form of ash, all the non-volatile nutrients of the biomass, which implicates increase in pH and soil fertility, and improved pasture growth. In spite of being well adapted to the acid and lowfertility soils of the savanna, native grasses present low primary productivity; they seem to be responsible for improvement of the production environment, especially through fertilization. The effects of N fertilization on forage yield and morphogenetic and structural characteristics of Axonopus aureus in the savannas of Roraima were evaluated
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