The study was carried out at CIEY, Km 17-UNAP, with the aim of evaluating the nutritional productivity of maralfalfa grass (Pennisetum sp.) with organic fertilizer; for which the following treatments were used: T0 without fertilizer; T1 cow manure 12 kg / 6 m2; T2 cow manure 18 kg / 6 m2; T3 chicken manure 12 kg / 6 m2 and T4 chicken manure 18 kg / 6 m2; the parameters evaluated were percentages of crude protein (CP), fiber and ash; a statistical design Completely Randomized Blocks (DBCA) was used with 5 treatments and 4 repetitions; the results were subjected to the Tukey test. The effect of organic fertilizers was evaluated at 45 and 60 days after the uniformization cut; regarding the % of crude protein, significant statistical differences were found, highlighting T4 with 8.65% of crude protein at 45 days; Similarly, at 60 days, significant statistical differences were also found, wher...