The present research, interpretation system of agricultural soils in the soils laboratory UNSM-T; general objective, develop a system of information that interprets the results of a soil analysis at the Laboratory of Soil UNSM -T; likewise specific objectives, perform a simple interpretation that facilitates proper land use of farmers in the San Martin region, recommend the application of certain technical actions to achieve better results in the fields of producers, complement the service provided by the Soil Laboratory of the UNSM -T. For its development methodologies were used. For the collection of information, surveys, interviews, as well as review and assessment documents were made; Software development methodology RUP and Knowledge Engineering John Durkin under development approach was used expert systems and their implementation is done with the ASP language and IIS Server on Win...