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

Revista Brasileira de Zootecnia

Newton De Lucena Costa²  Anibal De Moraes¹  Alda Lúcia Gomes Monteiro¹  Antonio Carlos Vargas Motta¹  Ricardo Augusto De Oliveira¹  Antonio Neri Azevedo Rodrigues¹ 

[1] ,Embrapa RoraimaBoa Vista RR ,Brazil

关键词: dry weight;    leaf;    senescence;    tillering;   

DOI  :  10.1590/S1516-35982013000800002

来源: SciELO

【 摘 要 】

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.

【 授权许可】

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