This research was conducted at the farm "The Pacific" located in the district and province of Lamas, San Martin department, with geographical location of 76 º 30 '45 'W, 06 º 20' 15" latitude msnmm south and 835, with the objective of evaluating the quality of crop yield and Chinese onion (Allium fistolosum) chiclayana red range, in a dose with 20 t.ha-1 pollaza, compared with 4 doses of biological organisms (EM) applied to the soil. Also determine the cost of production for each treatment in a cost / benefit analysis. The doses studied Biological Microorganisms: 3 l.ha-1 (T1), 6 l.ha-1 (T2), 9 l.ha-1 (T3}, 12 l.ha-1 (T4) and no application (T5), respectively for each treatment, the effective microorganisms were applied 15 days before sowing, at the time of incorporating pollaza, then at the time of sowing and 15 days after planting. The assessments were made under a Design Randomized ...