In order to determining the concentration or dose of Oxiadiargyl and Oxadíazon and their type of insert appropriate for the use of this herbicides. Likewise to determine the relation. ship Benefit - cost of the best alternative in the cultivation of rice (Oryza sativa L) to the transplant, one carries out the: present work between April and September of 1998, in Juan's War District, County of San Martin and Region San Martin, Iocated geographically to 66 38" South latitude and 72° 21' altitude West. Being their altitude 230 meters on the level of the sea. The conduction of the experiment one carries out in the experimental fields of the program National Rice, of the Experimental Station Coming" - INIA- Tarapoto. The experimental design used for most of the experiment was die block completely Randomizados (DBCR) with arrangement factorial de 2x3x2 with 3 repetitions and 2 Witness. Two g...