Cotton weed control by crop rotation in Côte d'Ivoire

Since the intensification of the cotton crop, certain uncontrolled weeds have developed abundantly. A trial with seven crop rotations was carried out at the CNRA cotton research centre in Bouake, from 2000 to 2002 to find the best weeding methods. Euphorbia heterophylla L. was the main weed of the flora. The best weeding resulted from the following crop rotations: corn-cotton-rice and rice-cotton-corn. They allowed a decrease in population densities of E. heterophylla and Trianthema portulacastrum L. of at least 83 %.