The secondary tillage with the use of the disk harrows is the one that is carried out generally in Venezuela, due to the inadequate friability conditions, the opportune time of the operation, purchase price relatively cheaper, easy use and maintenance, the weed control is easy and quicker, and the application of lime. It is the certain farm tool in the agricultural fields of the whole Country. The specific objectives are the disk harrows evaluation with the purpose of appreciating some economic parameters that cooperate their use process in decision taking: (a) The total costs including the timeliness factor (0,0002 day-1), (b) energy costs, (c) evaluation of the optimum economic width by maxim and minimum and (d) Comparisons with lease prices. In the methodology it was used the costs analysis and the regression analysis, to the cost items. Among the obtained results: The total costs of 14561,20 (USD/year), the optimum economic width of harrowing similar to 0,153*AR0,515 (m), the cost for disk harrowing pass turned out to be of 20 USD/ha if it is leased, and of 33,71 USD/ha if the team tractor-harrow were acquired. It is concluded: (a) The disk harrows caused high production costs to the proprietary and it was better the use of an external service for field less than 1311,85 ha/year and (b) it would be demanded an unit tractor-harrow by each 432 ha/year, this was overalls due to that the harrows used in the Venezuelan field are very small. ; La labranza secundaria con el uso de las rastras de discos es la que generalmente se realiza en Venezuela, debido a las condiciones inadecuadas de friabilidad, el tiempo oportuno de la operación, precio de adquisición relativamente más barato, fácil uso y mantenimiento, el control fácil y más rápido de malezas y la aplicación de cal. Es el apero más común en los campos agrícolas de todo el país. Los objetivos específicos son la evaluación de las rastras de discos con el propósito de apreciar algunos parámetros económicos que coadyuven su proceso de uso en la toma de ...