[Life history traits of an var. population with extreme adaptations to rice planting systems].

Long-term herbicide application may facilitate the adaptive evolution of weed populations. With var population A from a rice field used for the experiment of effectiveness of herbicide in Nanling County, Anhui Province, we conducted common garden experi-ments with seeds of population A and three control populations collected from normal rice fields. Compared with the three control populations, population A had significantly lower seed production for individual plant, but higher 1000-seed weight.