ホテイアオイの生育に伴なう栽培液の形態別窒素の挙動

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It was studied to examine the changes of nitrogen sources in water hyacinth aquatic treatment systems (cultured area ; 0.3m^2,initial value of water hyacinth ; 600g, contacting time ; about 24 hr.). Influent was introduced from outlet of extended-aeration plants. Results in growthing period of water hyacinth (from early summer to fall) are as follows : 1) Total nitrogen was decreased by approximately 4 mg/l (22%) in average. Ammonium nitrogen was decreased by 2.8 mg/l, but decrease of nitrate nitrogen was not seen. 2) In basic water (pH≩6.5 ), decrease of ammonium nitrogen was seen remarkably. Conversely, decrease of nirate was seen slightly in acidic water (pH<6.5) according to t-test (risk rate : 10%). 3) It was suggested that nitrogen sources absorbed by water hyacinth were both ammonium nitrogen and nitrate, but rate of absorption by water hyacinth was depended to pH levels in culture water.
岡山理科大学の論文