六、化学除草直播水稻必须及时进行化学除草,这是水稻直播成败的关键技术之一。杂草特别严重的田块,早稻播前7天～10天,每667平方米用10%草甘膦500毫升～1000毫升对水40公斤喷施,降低杂草基数,或者在播前四五天整好田、开好沟,每667平方米撒施丁草胺120克,保水四五天后再排水播 Six, chemical weeding direct seeding rice must be timely chemical weeding, which is one of the key technologies of success or failure of rice. Weeds particularly serious plots, early rice sowing 7 days to 10 days, every 667 square meters with 10% glyphosate 500 ml ~ 1000 ml sprayed on the water 40 kg, reducing the weed base, or four or five days before sowing Tianzao good field, a good ditch, every 667 square meters Caesar grass 120 grams, rehydration after four or five days water retention