Field experiments were conducted during two growing seasons to investigate the effect of different Common thorn-apple (Datura stramonium l.) densities on seed production of this specie. Maize (Zea mays l.) was planted in 2.1 m rows with a plant population of 16000 plants.ha-1 . D. stramonium was planted at five densities in association with maize. The time of weed seed production, total seed production of each D. stramonium plant and of each plant population were determined. Seed production of D. stramonium decreased with increasing density stress, with a substantially greater effect during an unfavourable season. The study provided information on timing of weed control and the implications of weed seed contamination in the absence of weed control. This may contribute to more effective, economic and environmentally friendly weed control.'n Veldproef is gedurende twee groeiseisoene geloods om effek van verskillende Gewone stinkblaar (Datura stramonium l.) digthede op die saadproduksie van hierdie spesie te ondersoek. Mielies (Zea mays l.) is in 2.1 m rye geplant, met 'n plantpopulasie van 16 000 plante.ha-1 . Die tye van onkruidsaadproduksie, die totale saadproduksie per D. stramonium plant en per plant populasie is gemoniteer. Saadproduksie van D. stramonium neem af met 'n toemame in onkruiddigtheid, met 'n groter effek in die ongunstige seisoen. Die studie verskaf inligting aangaande die tydigheid van onkruidbeheer en die implikasies van onkruidsaadbesmetting indien geen onkruidbeheer toegepas word nie. Dit kan bydra tot meer effektiewe, ekonomiese en omgewingsvriendelike onkruidbeheer.
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