水稻直播是一种省工省力高产高效的栽培技术，近年在我国发展很快。由于直播稻田杂草生长与稻苗生长基本同步，草、苗争肥、争光，若不及时除草，便会引起草荒，造成减产，甚至绝收，因而需要予以重视。对于草害，应用化学除草剂仍不失为一种有效的方法。1996年我们对金秋等3种 Live rice is a province of labor-saving high-yielding and efficient cultivation techniques, developed rapidly in China in recent years. Due to the fact that the growth of weeds in direct-seeded rice paddies is basically synchronized with the growth of rice seedlings, grass and seedlings competing for fertilizer and winning glory will cause grass waste if they are not weeded in a timely manner, resulting in reduced production or even excessive harvest. For grass damage, the use of chemical herbicides is still an effective method. In 1996, we had 3 kinds of autumn