The Study On Breaking Dormant And Screening Preferent Chemical Herbicides Of Codonposis Lanceolata Bentn.et Hook.f.

We studyed on breaking dormant and screening preferent chemical herbicides of Codonposis Lanceolata Bentn.et Hook.f. in order to solve the low rate of germination and difficulty of weed control during the cultivation of Codonposis Lanceolata Bentn.et Hook.f.. The result showed:the seeds of Codonposis Lanceolata Bentn.et Hook.f. have incomplete dormancy. Gibberellin can improve the germination percentage significantly. The seeds can acquire the highest germination percentage 80% or so if treated with 760mg/L gibberellin for 125 minutes. The herbicide mixtures of Napropamide and Pendimethalin is fairly good for the weed control of seedling Codonposis Lanceolata Bentn.et Hook.f.. The pot experiment showed that the herbicide effect can reach 90% if treated with the constitute of Napropamide 2.0kg/ha and Pendimethalin 2.0kg/ha. The two herbicides expressed additive effect in low dosage but independent effect in high dosage. The suitable soil relative humidity extent to the constitute is 70% or so. Paraquat is good herbicide for the weed control of annual Codonposis Lanceolata Bentn.et Hook.f.. We can sprayed Paraquat (1.0kg/ha) to them by bottom treatment when the height of annual Lance have Asiabell reached 50~100cm,and the integrated control effect can reach more than 90%.