Abstract
Water hyacinth was cultured in a flow-through system with constant nutrient availability and 1.4 mg 1 −1 NO 3-N as the nitrogen source. Tissue nitrate content ranged from 0.05 to 0.21% of dry wt. and accounted for 1.7–6.6% of the total nitrogen in the plant. Highest tissue nitrate levels occurred during the winter period of low plant growth rates and decreased as dry matter productivity increased. In the winter, the nitrate content of water hyacinth exceeded levels considered safe for conventional forage crops used for livestock feed.
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