Effect of nutrient eluted from hedoro brock on growth and survive of Brown algae sprouts

I Results of laboratory experiment(In A Year Of 1997)When each sample of blocks submerged in filtrated seawater during the 28days，hedoro nutrient in the solution increased with time，and in particular，amount of NO I D 23 I D 2 I D 1-I D 1-N and NO I D 22 I D 2 I D 1-D 1-N reached saturation on the 10天.Lower the cement ratio is，for instance，fragiler the block makes，the concentrations of NH I D24 I D 2 I D 1+I D 1-N and PO I D 24 I D 2 I D 1-D 1-P eluted inside are higher.The growth ratio of gametophyte as well as sporophyte of brown algae Eisenia bicyclis was the greatest in case of the solution showing the least cement ratio of 30%.On the other hand，the survival ratio of algal sprouts decreased linearly with time，and in case of the solution for hedoro block，the ratio of decrease stood for smaller than that for mortal one.II Results of outdoor experiment(In A Year Of 1998)Diatom inserted in the surface of each specimen block，and Brown algae Eisenia bicyclis did not live there.In future，such a research would be triess again when wake make the hardnardof block，the survival ratio of algreased linearly with time，and in case of the solution for hed.

I Results of laboratory experiment (in a year of 1997)When each sample of blocks submerged in filtrated seawater during the 28 days, hedoro nutrient in the solution increased with time, and in particular, amount of NOィイD23ィエD2ィイD1-ィエD1-N and NOィイD22ィエD2ィイD1-ィエD1-N reached saturation on the 10 th day. Lower the cement ratio is, for instance, fragiler the block makes, the concentrations of NHィイD24ィエD2ィイD1+ィエD1-N and POィイD24ィエD2ィイD1-ィエD1-P eluted inside are higher. The growth ratio of gametophyte as well as sporophyte of brown algae Eisenia bicyclis was the greatest in case of the solution showing the least cement ratio of 30%. On the other hand, the survival ratio of algal sprouts decreased linearly with time, and in case of the solution for hedoro block, the ratio of decrease stood for smaller than that for mortal one.II Results of outdoor experiment (in a year of 1998)Diatom inserted in the surface of each specimen block, and Brown algae Eisenia bicyclis did not live there.In future, such a research would be tried again when we make the hardness of block greater.