1.6 the variables studied. 1.6.1 variant started. The planting period in 1.6.1.1 1.6.1.2 the vetiver plant vetiver semi-evergreen lowland and is.1.6.1.3 age range, growth is growth age range 1 – 6 months.1.6.3 the control variables. 1.6.3.1, number of plants 1.6.3.2 the dirty water into the system's value is the value of TK n, phosphorus is the actual value that is used in the experiments. 1.6.3.3 plant height of start is in the range of 25-30 cm in size, the default root length in the range 0.2 – 0.5 cm.1.6.3.4 season (hot, cold, rain). 1.6.1 General environment factors. 1.6.4.1 water temperature. 1.6.4.2 climate
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