Technology Levels in Cassava Cultivation Alter Phytosociology of Weeds

This study aimed to assess the phytosociology of weeds as a function different crop management technology levels in cassava production. Field experiments were conducted Santa Maria (29°41′03″ S; 53°48′25″ W) and Itaqui (lat. 29°07′31″ long. 56°33′11″ W), Rio Grande do Sul, Brazil. Treatments consisted three levels: low (postemergence weeding without basal dressing); medium (weeding performed at 7 40 days after planting fertilization with 6.25, 25, 25 kg⋅ha −1 N, P, K, respectively); high application s-metolachlor; 1250 lime 12.5, 50, 50 respectively). Weed frequency, density, relative abundance, importance values calculated for each location. Then, locations compared using dissimilarity matrix. density diversity decreased linearly increased. The predominant weed species found belong Poaceae family. presented highest among locations. genus Cyperus had value index Maria. use S-metolachlor level provided lower frequency than did chemical control