The research work was carried out at the National University of the Peruvian Amazon at the Faculty of Agronomy in the Beef Project in the Fundo de Zungarococha, entitled Two cultivars of Panicum maximum (mombasa and tanzania) and two concentrations of effective microorganisms (em-1) in the agronomic characteristics and forage yield in iquitos, peru - 2019. The evaluations were carried out at the tenth week after sowing with vegetative seed (bushes), in plots of 3 mx 1.2 m (3.6 m2) and an experimental area of 141.1 m2. With a Complete Random Block Design (DBCA), with a factorial of 2 x 2 with four treatments and four repetitions, the treatments under study were: T1 (Tanzania culture with a concentration of 10% of EM - 1), T2 ( Tanzania culture with a concentration of 20% of EM-1), T3 (Mombasa culture with a concentration of 10% of EM-1) and T4 (Mombasa culture with a concentration of 20% ...