The Study of Cutting Control Effect on Growth of Submersed Aquatic Weeds, (Chara vulgaris) and (Najas felexilis) in Azadegan Lake Park of Tehran

Chara (Chara vulgaris) and Najas (Najas felexilis) are two submersed weeds which are found in rich waters. The excessive growth of these plants cause the reduction in utilization of water resources and making some ecological and economical damages in these areas. In most fresh water systems, such as wetlands, streams and lakes, the efficacy of mechanical methods is well documented for major weed species. The aim of this study was to determine the response of C. vulgaris and N. felexilis to cutting in three levels (once, twice and without cutting) in Azadegan lake park of Tehran. The test was examined in factorial design with three replications. The tested parameters included plant length and dry weight. The results of this experiment showed that once cutting in comparison with control treatment, made 43/75 and 13/8 percent reduction in length of C. vulgaris and N. felexilis, respectively. Also, twice cutting compared with only once, caused considerable (P≤0.05) reduction in growth of test plants. Thus, cutting and its replication, because of creating more stress and reduction in carbohydrate stock, brought about a better control effect on test plants.