Herbicides conditions: additive effect. Addition effect refers to the herbicidal effect of two herbicides actual herbicidal effect equal calculated based on the relevant model and two herbicides alone. Synergies. Synergism refers to two herbicides herbicidal effect is greater than the actual calculated based on the relevant model two herbicides alone herbicidal effects combined. Herbicide injury prevention: Note crops sensitive period. Under normal circumstances, Luoyang tribenuron, crops germination, clover and flowering before the filling of the herbicide are particularly sensitive, prone to injury. Master agent performance. Master agent is volatile, photolysis, is prone to physical or chemical reactions in the soil.