Abstract
To further understand the phytoremediation of the fresh water environment and animal feed production using water hyacinth (Eichhornia crassipes (Mart.) Solms), we investigated the seasonal dynamics of population structure and chemical composition of the plant in a basin of the Aso region of Kyushu district.The live phytomass was increased from 31.2gDM m-2 at transplantation (May 1) to 2543.3 g DM m-2 at 165 days of cultivation (Oct. 13), after which the phytomass decreased. The estimated maximum growth rate of the live phytomass was 32.6g DM m-2 day-1 at 84 days (July 24). The optimum leaf area index was estimated as 6.9. Net assimilation rate of the live phytomass was 6.5 g DM m-2 day-1 between transplantation (May 1) and 45 days of cultivation (June 15), after which the rate decreased linearly. Crude protein (CP) content and in vitro dry matter degradability (IVDMD) of the live phytomass were 10.0 to 21.5% and 47.1 to 60.0%, respectively. CP content and IVDMD were higher in the leaf blade, petiole, rhizome, and stolon than in the root. The amount of nitrogen uptake by the plant was 45.6 g N m-2 year-1.
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