Usage: When controlling broad-leaved weeds and Japanese scirpus japonicus in the northeast rice area, the effective components of 2-methyl-4-sodium chloride for transplanting rice fields are 230-60g and 50-70g per 667m, respectively, and it is generally applied in early July. When mixed with Daphne odora (active ingredients are 2 1 g and150g, respectively), adding water15 ~ 30kg for spraying three weeks after transplanting can not only control Trigonella, but also control barnyard grass. Practice has proved that it is effective to mix 2-methyl-4-chloro-sodium salt with bentazon in the field with broad-leaved weeds as the main materials. When Sparganium10 ~ 30 cm, 48% bentazon 100 ml (20 g and 48 g of active ingredients, respectively) was added every 667 m 2 for stem and leaf treatment, and the effect was better. In direct seeding paddy field, in order to control barnyard grass and Trigonella hybrida, 50 ~ 75 ml of 20% sodium 2-methyl-4-chloro-sodium salt solution, 400 ~ 650 ml of 20% fenpropargyl emulsifiable concentrate and 25 ~ 50 g of 40% weedicide ether milk powder can be used every 667 m ~ 2 during the 2 ~ 3 leaf stage of rice seedlings, and after mixing, water is added to spray evenly. Generally, when barnyard grass is in the two-leaf stage, the control effect is ideal. When barnyard grass has more than 3 leaves, the dosage of barnyard grass should be increased appropriately.