Abstract:

【Objective】To clarify the weed control effect and the safety of varying application doses of pre-seedling blocking herbicides,metolachlor and pendimethalin on chickpea seedlings.【Methods】The weed control effect and the safety of chickpea growth in the field were evaluated using a random block design of 96% metolachlor EC 1 200 mL/hm²(C1),1 500 mL/hm²(C2),1 800 mL/hm²(C3),3 000 mL/hm²(C4)and clean water(CK1),or 450 g/L pendimethalin CS 1 500 mL/hm²(T1),2 250 mL/hm²(T2),3 000 mL/hm²(T3),4 500 mL/hm²(T4)and clean water(CK2)combined with 87.5% 2,4-D isooctyl ester EC 600 mL/hm².【Results】96% metolachlor EC and 450 g/L pendimethalin CS combined with 87.5% 2,4-D isooctyl ester EC could effectively control monocotyledonous weeds and dicotyledonous weeds in chickpea field. The control effect of C4 treatment was significantly higher than that of other treatments(P<0.05). There was no significant difference in the control effect on monocotyledonous weeds and total weeds between T4 treatment and T3 treatment 45 days after application(P>0.05). The control effect of T4 treatment on dicotyledonous weeds and total weeds was significantly higher than that of other treatments 30 days after application(P<0.05). Different doses of 96% metolachlor EC and 450 g/L pendimethalin CS did not cause any damage to chickpea seedlings.【Conclusion】96% metolachlor EC 3 000 mL/hm² and 450 g/L pendimethalin CS 4 500 mL/hm² had better control effects on monocotyledonous weeds,dicotyledonous weeds,and total weeds. The test doses were safe for chickpea growth.

Key words: Herbicide, Chickpea, Weeds, Control effect, Safety