Seed retention of ten common weed species at oat harvest reveals the potential for harvest weed seed control

摘要

We assessed the seed production and shedding pattern of 10 common weed species in two oat fields in Denmark. The aim was to evaluate the possibility of harvesting retained seeds on weeds at crop harvest by a combine harvester based on estimation of weed seed retention. Before flowering, ten plants of each weed species were selected and surrounded by a seed trap comprising of a porous net. When the plants started shedding seeds, the seeds were collected from the traps and counted weekly until oat harvest. Just before oat harvest, the retained seeds on the plants were counted and the ratio of harvestable seeds and shed seeds during the growing season was determined. The seed production and shedding patterns varied between the 2 years. Across both years,Anagallis arvensisL.,Capsella bursa-pastorisL. Medik,Chenopodium albumL.,Geranium molleL.,Persicaria maculosaGray,Polygonum aviculareL.,Silene noctifloraL.,Sonchus arvensisL.,Veronica persicaPoir. andViola arvensisMurray retained on average 61.6%, 52.7%, 67.2%, 58.4%, 32.05%, 59.5%, 95.7%, 23.5%, 51.7% and 33.9%, respectively, of their produced seeds at crop harvest.Silene noctiflorawas classified as a good target for harvest weed seed control;C. bursa-pastoris,C. album,G. molle,P. maculosa,S. arvensisandV. arvensiswere classified as intermediate targets; andA. arvensis,P. aviculareandV. persicawere classified as poor targets.