This study was carried out in Thai Nguyen province during 2 years 2007 and 2008 to detemine the most effective ure levels in fertilizing Brachiaria decumbens Basilisk for productivity and animal feed quality. Six levels of ure 0, 20, 30, 40, 50 and 60 kg N/ha/cut were tested. The dry matter productivity (ton/ha/2 year) of the grass in two years ranged as follow 14.08
19.80
23.45
25.16
27.27
26.60 ton/ha/2 years, with 6 levels of ure respectively. Increasing dry matter productivity per 1kg N is 23.83
26.03
23.08
21.98
17.39 kg. Fertilizing for B.decumbens at two level ofure 30 and 40 kg N/ha/cut is the best.