Catch crops undersown in spring barley - competitive effects and cropping methods

application rates azote biological competition biomasa biomass biomasse cantidad de semilla requerida catch cropping chenopodium chenopodium album crop yield cultivo intermedio cultivos de primavera culture de printemps date de semis dose d'application ensemencement facteur de rendement factores de rendimiento fecha de siembra hordeum vulgare leaching lessivage du sol lolium multiflorum malezas mauvaise herbe nitrogen plant competition rendement des cultures rendimiento de cultivos seeding rates siembra sowing sowing date spring crops suecia sweden trifolium trifolium pratense weeds yield factors