The project was carried out in Juanjui during two periods, the first from 26 August to 20 September 2013, the second from 18 November to 13 December 2013. The specific objectives were to identify the weeds in the field, assess the biomass, density, height of the weeds and the linear regression between them; locate strips of transparent plastic, on the ground, between the rows of corn, and determine the mortality of the weeds. The wording of the problem, how is the percentage of mortality of weeds in the transparent plastic interaction - solar radiation, located at different times after planting, in an agro ecosystem unstable, a corn field, in the Juanjui district?. The variables were: lnteraction clear plastic-solar radiation (independent variable) and the mortality percentage of weeds (dependent variable), taking the hypothesis to prove, if we clear plastic interaction- solar radiation ...