The present work of titled investigation: "Effect of the lncorporation of Efficient Microorganisms in the process of decomposition of the Organic Matter", has like objectives: 1) To determine the time of decomposition of the organic matter, 2) To determine the effect that will have the efficient microorganisms in the quality of compost obtained and 3) To determine the relation cost/benefits of the treatments. The present work was realised in the E. E. "Juan Bernito - ICT", for which a design of blocks at random (OSCA) with 5 treatments and 3 repetitions was used completely. The treatments in study were the following: T1 (100 kg of Vacaza + 100 kg of Strubble + 20 ce of efficient Microorganisms), T2 (100 kg of Gallinaza+ 100 kg of Strubble + 20 ce of efficient Microorganisms), T3 (100 kg of Vacaza + 100 kg of Strubble), T4 (100 kg of Gallinaza + 100 kg of Strubble), T5 (200 kg of Strubble...