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

Revista Brasileira de Zootecnia

Motta, Antonio Carlos Vargas¹  Rodrigues, Antonio Neri Azevedo³  Costa, Newton de Lucena²  Moraes, Anibal de¹  Monteiro, Alda Lúcia Gomes¹  Oliveira, Ricardo Augusto de¹ 

[1] UFPR, Curitiba, Brazil;Embrapa Roraima, Boa Vista, Brazil;Instituto Federal de Rondônia, Colorado do Oeste, Brazil

关键词: dry weight;    leaf;    senescence;    tillering    Introduction In Roraima State;    Brazil;    burning is a practice commonly utilized in the management of native pasture because of its low cost and easy application;   

DOI  :  10.1590/S1516-35982013000800002

学科分类：兽医学

来源: Universidade Federal de Vicosa

【 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】

CC BY-NC