| Aiming at the present situation of few registered herbicides and the fact of phytotoxicity on tobacco inChina, the efficiency of three kinds of pre-emergence herbicides（ Metolachlor, Napropamide, Butralin） and three kinds ofpost-emergence herbicides（ Bentazone, Rimsulfuron, Quizalofop-p-ethyl） combined were tested respectively. The resultsshowed that, with the best dosage of Metolachlor 404.80 g/hm2 × Butralin 899.55 mL/hm2, the control effects of plantand fresh weight to dicotyledonous weeds were synergistic, and the efficiencies were 93.1% and 87.1%, respectively; withthe best dosage of Napropamide 281.11 g/hm2 × Butralin 899.55 mL/hm2, the control effects of plant and fresh weightto endogen weeds were 89.9% and 91.0%, the control effects of plant and fresh weight to dicotyledonous weeds weresynergistic, and the efficiencies were 87.7% and 85.3% respectively. The post-emergence herbicides had no synergisticeffect, the control effects of plant and fresh weight to endogen weeds were 88.8% and 92.6% with the dosage of Bentazone179.91 g/hm2 × Quizalofop-p-ethyl 56.22 mL/hm2, the control effects of plant and fresh weight to dicotyledonous weedswere 94.2% and 93.6% with the dosage of Bentazone359.82 g/hm2 × Quizalofop-p-ethyl 28.11 mL/hm2;while the control effects of plant and fresh weight toendogen weeds were 93.6% and 95.0% with the dosageof Rimsulfuron 9.37 g/hm2 × Quizalofop-p-ethyl 28.11mL/hm2. |
