This thesis project entitled "Dispersion Analysis of the concentration of N03- by the Rice activity in the Indoche river, Moyobamba tier - Yantalo, 2013", is about the development of a study of the dispersion of the compound nitrate (N03-) in a final stretch of5 km ofthe river Indoche until its mouth the River may. The study area ofthe project covers an area of 312.24 hectares. The jurisdiction to which belongs the project area, corresponds to the Moyobamba district and province, San Martin region. The watershed to which belongs the project area, is the basin of the Indoche river (that has an extension of 54,364.68 ha), representing the study area, the 0.57 % of the total area of the basin. In the study area, the predominant crop is rice, occupying approximately 4 7% of the study area. According to INFOAGRO (www.infoagro.com), mentions that the subscriber for the cultivation of rice is p...