桃源县直播稻田杂草发生与防除对策初探

经调查，桃源县直播稻田杂草发生特点主要表现为：发生时间长；有3个出草高峰，即播后7～10d、15～20d、35～50d。有利杂草发生的成因主要是直播稻田干湿交替时间长，水稻前期竞争力弱，秧苗期和本田期整个生育期长等。针对杂草发生特点，因地制宜提出了选取“除、封、杀、补（或拔）”的杂草综合防除对策。

Occurrence Causes and Control Strategies of Weeds in Direct Sowing Rice Field in Taoyuan County

The major characteristics of weeds occur in direct sowing dee field in Taoyuan County are as follows: long occurrence time; there are three germination peaks, which ale 7～10 days, 15～20 days and 35～50 days after sowing. The favorable causes for weeds oocurrence mainly are as follows: long alternate time of dry-wet in direct sowing rice field, weak competitive power in prophase of rice growth, long whole growth period (seedling period and growth period). According to these characteristics of weeds oceurrenee, the integrated control strategies for local status were proposed, which are removing, sealing, killing and pulling.