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2 年调查研究表明,直播稻田杂草发生规律是:发生时间长,有2 个明显的萌发高峰—播后10~20d 和25~35d;抛秧稻田于抛后5~15d 出现杂草萌发高峰;杂草种类多—其中发生较重的有7 科11 种杂草;发生量大,种群组合复杂—发生总量是移栽稻的5~6 倍;部分恶性杂草由旱地向稻田蔓延,危害严重。分析其发生重的主要原因是直播稻播种量少,秧田期和本田期干湿交替时间长,封行期推迟,各种条件有利于杂草的萌发为害。根据其发生特点,提出了“药除,水控,后补”的杂草综合治理对策。
2 years of investigation and study showed that the law of direct weed in paddy fields was: long time to occur, there are two obvious germination peak - 10 ~ 20d and 25 ~ 35d after sowing; throwing rice field 5 ~ 15d after throwing weeds germination peak ; Weeds species - which occurred in heavier 7 families and 11 weeds; large amount of occurrence, complex population combination - the total occurrence of transplanted rice 5 to 6 times; part of the weeds from the dry land to paddy fields, Seriously harmful. The main reason for the occurrence of heavy rice is that seeding rate of direct-seeding rice is low, alternation of wet and dry periods of seedling and Honda period is long, and the sealing time is postponed. Various conditions are conducive to the germination of weeds. According to its occurrence characteristics, put forward the “weeding, water control, after-fill” comprehensive weed control measures.