| Title |
The effect of nutrients concentration upon the growth of water hyacinth |
| Authors |
전만식 ; 김범철 ( Man Sig Jun ; Bom Chul Kim ) |
| Abstract |
The growth rate and the nutrients removal efficiency of water hyacinth in artificial medium were studied. Water hyacinth showed maximum growth rate at the density of 5-18㎏ wet wt./㎡, when the yield was 0.67-1.23㎏ wet wt./㎡/day. The removal rate of phosphorus and nitrogen was 153 and 1,184㎎/㎡/day, respectively. Growth rate significantly decreased at low nutrients concentration below 0.8㎎P/ℓ and 3.1㎎N/ℓ. The maximum specific growth rate(μ_(max)) of water hyacinth was 0.101day and half saturation concentration(Ks) was 0.032㎎P/ℓ and 0.410㎎N/ℓ for phosphorus and nitrogen, respectively. The shoot/root weight ratio, varying from 1.8 to 14.1, was smaller at low nutrient concentration due to the enhanced development of root. The contents of phosphorus and nitrogen in the dried tissue were 0.22-1.02% and 1.4-4.3%, respectively. The water content was 88.9-93.9%. The removal efficiencies of P and N were 90% and 71% when retention time was 5.7day, and the standing crop was 3.8㎏/㎡. |