关键词: 小麦田, 阔叶杂草, 自走式喷雾机, 防效

Abstract: In order to clarify the control effect on broadleaf weeds and safety during the application process of self-propelled sprayers with different nozzle models (No.1.5,No.2),different pressures (0.2 MPa,0.4 MPa) and heights (30 cm,60 cm) in wheat fields,the spraying effects of the self-propelled sprayer under different application factors (10% tribenuron-methyl wettable powder +20% fluroxypyr EC+40% carfentrazone-ethyl dry suspending agent) were measured through field experiments.The results showed that spraying with a self-propelled sprayer at a distance of 30 cm from the target weeds after 7 days caused certain phytotoxicity. After 14 days,the phytotoxicity basically recovered.After 21 days and 42 days,the plant control effect and fresh weight control effect of weeds under different treatments were investigated. When using No.1.5 or No.2 nozzle,with 0.4 MPa pressure,spraying at a distance of 60 cm from the target weeds,the plant control effect and fresh weight control effect reached more than 95%.In general,the weed control effect of No.2 nozzle,0.4 MPa pressure and 60 cm height was better than other treatment groups,it was safe for wheat and could significantly increase yield,and the control effect of low-dose after 42 days treatment on weeds reached more than 98%.It can be seen that selfpropelled sprayer is safe for wheat and has good weed control effect under the best application parameters.

Key words: Wheat field, Broad-leaved weed, Self-propelled sprayer, Control effect