1.2 the purpose of the research. 1.2.1 to study comparison between species of Palm (Vetiveria zizanioides) group with Palm species, Vetiver (Chrysopogon nemoralis), Don the appropriate floating islands planted in the system (Floating Island Wetland Treatment). 1.2.2 to compare performance to reduce nitrogen and phosphorus in the water source at each age, the growth of vetiver selected varieties already. 1.2.3 to compare performance. To reduce nitrogen and phosphorus in the water source of the vetiver system, floating islands. (Floating Island Wetland treatment) that a number of cultivars have been selected, and then.
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