This research paper entitled ¨ Effect of three sources and three rates of compost application of effective microorganisms in the development and performance of hybrid cucumber (STOMEWALL - F1) in the province of Lamas, San Martín Department ¨, which were tested 3 sources and 3 doses of compost used as sources: poultry, and cows whose dose of 10, 15 and 20 Tn.ha-1 and application of Effective Microorganisms (EM), was used randomized complete block design with factorial arrangement of 3 x 4, with 4 replicates and 12 treatments for combinations of sources and doses plus a control without fertilization. Based on the results and the discussions in this work was reached the following conclusions: the source of credit with better answers about the development of the pickle was the compost of which, who projected significant differences above the cows and Compost manure on plant height, numbe...