Effect of crop rotations on weed control, Bidens cernua and Erigeron canadensis populations, and carrot yields in organic soils

allium cepa barbecho barley bidens bidens cernua calidad canada carotte carrots cebada cebolla cereales cereals control cultural conyza conyza canadensis crop yield cultural control daucus carota escarda fallow hordeum vulgare lutte culturale meloidogyne hapla oignon onions organic soils orge pests of plants plagas de plantas quality quebec ravageur des plantes rendement des cultures rendimiento de cultivos root vegetables rotation culturale rotational cropping sol organique weed control zanahoria