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崇明岛新围垦盐碱地土壤盐度高,且偏碱性。围垦初期杂草以多年生恶性杂草为主,以后其他杂草种类和数量迅速上升。由于盐碱地上种植的直播水稻在二叶一心之前须采取日灌夜排的灌水方式,一般土壤处理除草剂不能使用,对杂草防治难度大。通过连续几年的调查、试验,针对盐碱地杂草发生特点,总结出一灭、二封、三杀、四补的杂草综合防治技术,在实践中取得很好的效果。
The soil salinization of the newly reclaimed saline land in Chongming Island is salty and alkaline. In the early reclamation weeds were dominated by perennial weeds, with other types and numbers of weeds rapidly increasing. Since the direct seeding rice planted on saline-alkali soil has to be irrigated at nighttime before the two leaves are prepared, it is generally difficult to control the weeds by using soil-treating herbicides. Through several years of investigation and experiment, according to the characteristics of the occurrence of weeds in saline-alkali land, we summed up a comprehensive prevention and control technology of weeds, one for two, three for killing and four for weeds and achieved good results in practice.