چكيده لاتين :
Using chemical weed control methods play an important role in the reduction of herbicide use as well as environmental protection, nowadays Appropriate land preparation, specially puddling has been known as one of the best factors for weed control in rice fields, plowing in late winter and then in one or two weeks before trans planting in spring, is the current method of plowing in Guilan province. Number of puddlings and type of equipment used, depends on conditions and farming system in different sites in Guilan province. since the Kind of equipment and number of secondary tillageʹs affect weed density, an experiment was conducted in 2005, The treatments included: Conventional method with once and twice puddling, the second puddling after a 10 day interval puddling, method once or twice, with a rotivator as well as puddling once or twice, with cone- puddler. These trials were conducted in rice fields in Taki Tazeabad village with 3 replications. Main noxious weeds were: Echinochloa crus-gali, Cyperus rotundas and Alisma plantago-aquatica. The results indicated that, number of tillage and kind of equipment affected weed population and density. The best treatment was conventional method with two puddlings which reduced weed density 2.1 times in comparison with the worst treatment that is, cone puddler with once puddling.
