Competition ability of cereal species and cereal varieties against weeds

altura avena biological competition biomasa biomass biomasse cultivos de primavera culture de printemps date de semis environmental temperature fecha de siembra fertilidad del suelo hauteur height hordeum vulgare light regimes lolium multiflorum paille paja plant density plant protection population density precipitation protection des plantes regimenes de luz rendement rendimiento root systems sistema radicular soil fertility soil types sowing date spring crops stems straw tallo temperatura ambiente tige triticum type de sol variedades varieties yields