In this study, experiments in a water culture system inhibiting the nitrification and denitrification were conducted in 2001 (May-Dec.), 2002 (May-Dec.), 2003 (Jan.-May) and 2004 (Jul.-Nov.) to evaluate the annual amount of nitrogen and phosphorus absorption in the aquatic perennial plant, Zizania latifolia.
The results were as follows: The amount of nitrogen and phosphorus absorption of a Z. latifolia was increased significantly in the early growth stage (from May to Jul.) and the maximum value of them was taken in September, the values were 680mg and 154mg, respectively. The amount of nitrogen and phosphorus absorption per wet weight of Z. latifolia were changed from 15mg·g-1 2.7mg·g-1 (in May) to 0.03mg·g-1, 0.01mg·g-1 (in Jan.), respectively. The amount of nitrogen and phosphorus absorption for the whole year was calculated as about 3, 600mg and 720mg, respectively.
