Abstract: The effect of 98% dazomet GR on weed control in wheat field was studied. The wheat yield, the content of N-P-K and water were also analyzed after weed control by dazomet. The results indicated that the efficacy of weed control was remarkable by 98% dazomet GR in wheat field. The control efficacy of dazomet on Beckmannia syzigachne, Galium aparine, Malachium aquaticum and Vicia sativa was ranged from 87.5% to 99.5%, which was significantly higher than the two control herbicides. After weed control, the consumption of nitrogen, phosphorus, potassium and water in the field was significantly reduced, and the water and nutrients conditions in the field were effectively improved. The wheat yield was ranged from 2 970.01 to 3 123.77 kg/hm² after treated with dazomet, which increased by 28.9%~35.6% compared to untreated control. Moreover, the yield income increased by 1 532.38~1 886.02 Yuan/hm².

Key words: dazomet, weed control effect, nutrient content, wheat yield