The weeds are classified as plants that         grow wild inside a crop. In arracacha crop for example, they can compete for natural resources like water, nutrients or light. Also, this kind of plants have been related with the phytoparasite nematodes   presence, causing low crop yield. The objective of this work was to determine the effect of different weed management on the crop production of arracacha turnip, in Cajamarca, Tolima (Colombia).