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为了掌握我市直播稻田出革规律和主要杂草生育动态，科学制订直播稻田杂草防除策略，确保水稻稳产、高产，我们于1996～1997年开展了直播稻（单季）田主要杂草出草规律及生育期的调查，现将调查结果整理如下：l调查方法1．l出草规律调查选择同期播种的单季晚稻直播田3块，每块?
In order to grasp the law of direct reclamation of rice fields in paddy fields and the development of the main weeds in the city, we have formulated a strategy of controlling weeds in direct-seeded rice fields and ensured stable and high-yield rice. From 1996 to 1997, we conducted a series of major weed- Grass law and the growth of the survey, the survey results are summarized as follows: l survey method 1. l drafting the law to investigate the selection of the same period sowing single season late rice direct broadcast field 3, each?