1.4 the research hypothesis 1.4.1 vetiver can grow in floodplains, vetiver type of reforestation floating Island, and you can reduce the nitrogen and phosphorus in water resources better. Vetiver semi-evergreen vetiver type.1.4.2 to bring selected Palm species, and then Effective in reducing nitrogen and phosphorus than vetiver is not used in the treatment. 1.4.3 the number of trees increases affect the efficiency of nitrogen and phosphorus in the vetiver reservoir. 1.4.4 age range there is vetiver's growth. Effective in reducing nitrogen and phosphorus in a reservoir.
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