Biomass flow in massai grass fertilized with nitrogen under intermittent stocking grazing with sheep

Revista Brasileira de Zootecnia

Marcos Neves Lopes²  Magno José Duarte Cândido²  Roberto Cláudio Fernandes Franco Pompeu¹  Rodrigo Gregório Da Silva¹  Thaíse Cristine Ferreira De Carvalho¹  Weberte Alan Sombra²  Luiz Barreto De Morais Neto²  Márcio José Alves Peixoto¹ 

[1] ,Universidade Federal do Ceará

关键词: morphogenesis;    nitrogen fertilization;    Panicum maximum × Panicum infestum;   

DOI  :  10.1590/S1516-35982013000100003

来源: SciELO

【 摘 要 】

This study evaluated the biomass flow of massai grass in regrowth subjected to different nitrogen levels (control - no fertilization; 400; 800; and 1200 N kg ha-1year-1) and under rotational stocking with sheep, in a completely randomized design with repeated measures over time. The leaf elongation rate increased with increasing nitrogen levels (N) and the fourth grazing cycle presented a lower value compared with the others. The stem elongation rate responded linearly with increasing levels of N, but it was not influenced by grazing cycles. The senescence rate of leaves remaining before grazing and after grazing were not influenced by the nitrogen fertilization or amended with successive grazing cycles. The phyllochron was influenced only by the nitrogen fertilization, with a decreasing linear response with nitrogen levels. Quadratic response was observed for the average length of leaves with increasing N levels and the grazing cycle 4 presented the lowest value for this variable. For each kilogram N ha-1 year-1, increases of 0.161 and 0.1604 kg ha-1 day-1 were verified in the herbage growth and accumulation rates, respectively. Nitrogen fertilization favors the biomass flow of massai grass, promoting an expressive increase in the production and accumulation of forage.

【 授权许可】

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