The present investigation work was carried out in the Experimental Station ''The Future"-Institute of Agrarian Investigation. District of Juan Guerra, County and Department of San Martín, with a geographical location of a Longitude west of 76° 20, south latitude of 6º24"y an altitude of 356 m.s.n.m., having like an area of life of Bs-tropical. The present work had as objectives to determine the variety y/o promissory line of peanut of more yield and adaptation to Juan Guerra area and to determine the cost benefit of the variety y/o line but excellent, proving 11 lines and 3 varieties (witness). The work began June 10 1998 with the siembra of the peanut placing two seeds for blow, to a distancing of 60 cm between arrays and 20 cm among plants, having like design of Complete Block Randomizado with 14 treatments and 03 repetitions and evaluating 12 parameters according to the methodology...